The formula is given by, = 2/T {equation 1} The reason for this is simple - the angular velocity is defined as the angle subtended in a certain time. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. (a) What is the magnitude of the orbital velocity of the earth in m/s? The outer moons of the giant planets tend to be small and have eccentric orbits with arbitrary inclinations. North of the Arctic Circle and south of the Antarctic Circle, an extreme case is reached in which there is no daylight at all for part of the year, and continuous daylight during the opposite time of year. [116][117] Within 7.5billion years, the Sun will have expanded to a radius of 1.2AU (18010^6km; 11010^6mi)256 times its current size. Distance from Earth Mean (10 6 km) 149.6 Minimum (10 6 km) 147.1 Maximum (10 6 km) 152.1 Solar Magnetic Field Typical magnetic field strengths for various parts of the Sun Polar Field: 1 - 2 Gauss Sunspots: 3000 Gauss Prominences: 10 - 100 Gauss Chromospheric plages: 200 Gauss Bright chromospheric network: 25 Gauss Ephemeral (unipolar) active . In 1989, Jacques Laskar's work indicated that Earth's orbit (as well as the orbits of all the inner planets) can become chaotic and that an error as small as 15 meters in measuring the initial position of the Earth today would make it impossible to predict where Earth would be in its orbit in just over 100 million years' time. ], In roughly 5billion years, the Sun will cool and expand outward to many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and leaving behind a stellar remnant known as a white dwarf. In the question number 62 , the linear acceletadiog ABOUT A FIXED AXIS 56. When Neptune, Uranus and Saturn perturb planetesimals outwards, those planetesimals end up in highly eccentric but still bound orbits, and so can return to the perturbing planet and possibly return its lost energy. When a red giant finally casts off its outer layers, these elements would then be recycled to form other star systems. Q: The mean orbital radius of the Earth around the Sun is 1.5 10 8 km. Since this value is close to zero, the center of the orbit is relatively close to the center of the Sun (relative to the size of the orbit). Some of the scattered objects, including Pluto, became gravitationally tied to Neptune's orbit, forcing them into mean-motion resonances. The orbital ellipse goes through each of the six Earth images, which are sequentially the perihelion (periapsisnearest point to the Sun) on anywhere from January 2 to January 5, the point of March equinox on March 19, 20, or 21, the point of June solstice on June 20, 21, or 22, the aphelion (apoapsisthe farthest point from the Sun) on anywhere from July 3 to July 5, the September equinox on September 22, 23, or 24, and the December solstice on December 21, 22, or 23. (b) What is the radial acceleration of the earth toward the sun in m/s2? [109], There is no consensus on the mechanism of the formation of the rings of Saturn. The mean orbital radius of the earth around the sun is 1.5 10, The average radii of orbits of mercury and earth around the sun are `6xx10^(7)` km and `1.5xx10^(8)` km respectively. Sol: As the centripetal forces is provided by the gravitational pull of the Sun on the Earth, $\large \frac{G M_s M_e}{r^2} = M_e r \omega^2 $, $\large \frac{G M_s M_e}{r^2} = M_e r (\frac{2\pi}{T})^2 $, $\large M_s = \frac{4 \pi^2 r^3}{G T^2} $, $\large M_s = \frac{4 (22/7)^2 \times (1.5 \times 10^{11})^3}{6.67 \times 10^{-11}\times (365 \times 24 \times 60 \times 60)^2} $, The orbital speed of an artificial satellite very close to the surface of the earth is V0 . RANK. The evolution of moon systems is driven by tidal forces. You can specify conditions of storing and accessing cookies in your browser. [63] The two are instead thought to have formed in orbits near Jupiter and Saturn (known as the "gas giants"), where more material was available, and to have migrated outward to their current positions over hundreds of millions of years. For general feedback, use the public comments section below (please adhere to guidelines). The radius of the earth's orbit around the sun (assumed to be circular) is 1.50108km, and the earth travels around this orbit in 365 days. Arthur Stanley Eddington's confirmation of Albert Einstein's theory of relativity led to his realisation that the Sun's energy comes from nuclear fusion reactions in its core, fusing hydrogen into helium. One notable example of this chaos is the NeptunePluto system, which lies in a 3:2 orbital resonance. [123], Gradually, the hydrogen burning in the shell around the solar core will increase the mass of the core until it reaches about 45% of the present solar mass. System of Particles and Rotational Motion, 76 IEE-Physics MATRIX MATCH TYPE QUESTIONS The mean orbital radius of the earth around the sun is 1.5 108 km. Mars's two small moons, Deimos and Phobos, are thought to be captured asteroids. The radius of the earth's orbit is 1.5*10^11m. If a planet's eccentricity is close to zero, then the ellipse is nearly a circle. [2] Ignoring the influence of other Solar System bodies, Earth's orbit is an ellipse with the Earth-Sun barycenter as one focus and a current eccentricity of 0.0167. [11] Planetesimals beyond the frost line accumulated up to 4MEarth within about 3million years. around the sun. About Us Become a Tutor Blog. The radius of the earth's orbit around the sun (assumed to be circular) is 1.50 10 8 k m, and the earth travels around this orbit in 365 days. [31], The various planets are thought to have formed from the solar nebula, the disc-shaped cloud of gas and dust left over from the Sun's formation. [58] A secondary depletion period that brought the asteroid belt down close to its present mass is thought to have followed when Jupiter and Saturn entered a temporary 2:1 orbital resonance (see below). [70] Moreover, alternative explanations for the small mass of Mars exist. This "Copernican Revolution" resolved the issue of planetary retrograde motion by arguing that such motion was only perceived and apparent. Again, using trigonometry, the radius or diameter of the Sun can be calculated from the distance between Earth and Sun, a, as 2R sun = tan (0.5 degrees) a. Resonance in Jupiter and Saturn's orbits moves Neptune out into the Kuiper belt. [29] This marked the Sun's entry into the prime phase of its life, known as the main sequence. When the Earth is closest to the Sun, it is said to be at perihelion. Credit: Xander89/Wikimedia Commons. This coincided directly with the planets' aphelion and perihelion, meaning that the planets' distance from the Sun bore a direct relationship to the speed of their orbits. However, this effect is much less significant than the total energy change due to the axial tilt, and most of the excess energy is absorbed by the higher proportion of surface covered by water in the southern hemisphere.[9]. [83][84][85] This origin is indicated by the large sizes of the moons and their proximity to the planet. [48][49] Further growth was possible only because these bodies collided and merged, which took less than 100million years. How will you weigh the sun, that is estimate its mass? Mean distance from Earth to Sun is 149.6106 km (8.31 minutes at the speed of light) Mass of the Earth is 5.97421024 kg Earth takes 365 days to go one complete circle around Sun. Sol: As the centripetal forces is provided by the gravitational pull of the Sun on the Earth G M s M e r 2 = M e r 2 G M s M e r 2 = M e r ( 2 T) 2 M s = 4 2 r 3 G T 2 Given, r = 1.5 10 8 Km = 1.5 10 11 m ; [99], The outer planets' orbits are chaotic over longer timescales, with a Lyapunov time in the range of 2230million years. I would like to subscribe to Science X Newsletter. [14] Late in the life of these stars, they ejected heavier elements into the interstellar medium. In modern times, Earth's perihelion occurs around January 3, and the aphelion around July 4. Earth orbits the Sun at an average distance of 149.60 million km (92.96 million mi)[1] in a counterclockwise direction as viewed from above the Northern Hemisphere. Objects orbiting the Earth must be within this radius, otherwise, they may become unbound by the gravitational perturbation of the Sun. The Earth's Moon is thought to have formed as a result of a single, large head-on collision. (b) What is the ratio of the kinetic energy of the asteroid to the . Earth's orbit. [94][95][96], The Solar System is chaotic over million- and billion-year timescales,[97] with the orbits of the planets open to long-term variations. Knowing where a planet sits in relation to its parent star, its orbital period, its axial tilt, and a host of other factors are all central to determining whether or not life may exist on one, and whether or not human beings could one day live there. An illustration of Keplers three laws of motion, which show two planets that have elliptical orbits around the Sun. times the mass of Earth, revolves in a circular orbit around the Sun at a distance that is 3.0 times Earth's distance from the Sun. [43] This scenario explains the Kuiper belt's and scattered disc's present low mass. In fact, the Earth is never the same distance from the Sun from day to day. Its. Formation and evolution of the Solar System, Galactic collision and planetary disruption. Six months later, when the northern hemisphere is tilted towards the Sun, the seasonal order is reversed. [13] The composition of this region with a mass just over that of the Sun (M) was about the same as that of the Sun today, with hydrogen, along with helium and trace amounts of lithium produced by Big Bang nucleosynthesis, forming about 98% of its mass. Its inner edge would have been just beyond the orbits of Uranus and Neptune, which were in turn far closer to the Sun when they formed (most likely in the range of 1520AU), and in 50% of simulations ended up in opposite locations, with Uranus farther from the Sun than Neptune. [24], At this point in its evolution, the Sun is thought to have been a T Tauri star. Any observer present to witness this occurrence would see a massive increase in the speed of the solar wind, but not enough to destroy a planet completely. If this initial disruption occurs, astronomers calculate a 12% chance that the Solar System will be pulled outward into the Milky Way's tidal tail and a 3% chance that it will become gravitationally bound to Andromeda and thus a part of that galaxy. [136], Studies of discs around other stars have also done much to establish a time frame for Solar System formation. The mean orbital radius of the earth around the sun is 1.5 108 km. At the same time, the Earth is constantly spinning around on its axis, an imaginary line running through the center of the Earth from the North Pole to the South . These compounds are quite rare in the Universe, comprising only 0.6% of the mass of the nebula, so the terrestrial planets could not grow very large. In 1.1 billion years, the Sun's increased radiation output will cause its circumstellar habitable zone to move outwards, making the Earth's surface too hot for liquid water to exist there naturally. movement of the Earth in orbit around the Sun, Belief that the Earth revolves around the Sun, Global 2 Enlightenment Review (Clickable), An asteroid that passes through Earth's orbit around the sun, the plane of the Earth's orbit around the sun. If a moon is revolving in the same direction as the planet's rotation and the planet is rotating faster than the orbital period of the moon, the bulge will constantly be pulled ahead of the moon. Although theoretical models indicated that the rings were likely to have formed early in the Solar System's history,[110] data from the CassiniHuygens spacecraft suggests they formed relatively late. For several centuries, astronomers have applied the scientific method to answer this question, and have determined that the Earth's orbit around the Sun has many fascinating characteristics. In this situation, angular momentum is transferred from the rotation of the primary to the revolution of the satellite. [132] In 4billion years, Andromeda and the Milky Way will collide, causing both to deform as tidal forces distort their outer arms into vast tidal tails. Ever since the 16th century when Nicolaus Copernicus demonstrated that the Earth revolved around in the Sun, scientists have worked tirelessly to understand the relationship in mathematical terms. [132] In addition, the infalling gas will feed the newly formed black hole, transforming it into an active galactic nucleus. Since the dawn of the Space Age in the 1950s and the discovery of exoplanets in the 1990s, the model has been both challenged and refined to account for new observations. That they continue to happen is evidenced by the collision of Comet ShoemakerLevy 9 with Jupiter in 1994, the 2009 Jupiter impact event, the Tunguska event, the Chelyabinsk meteor and the impact that created Meteor Crater in Arizona. In the northern hemisphere, winter solstice occurs around December 21st, summer solstice is near June 21st, spring equinox is around March 20th and autumnal equinox is about September 23rd. As the Sun burns through its hydrogen fuel supply, it gets hotter and burns the remaining fuel even faster. Terrestrial planets and the Moon form. The Earth and its Moon are one example of this configuration. The first recorded use of the term "Solar System" dates from 1704. The planet's distance from the Sun also varies as it orbits. Find the magnitude of the earth's angular velocity as it travels. Your feedback is important to us. Thus, the velocity of the earth is 29885.77486 m/s. Download Filo and start learning with your favourite tutors right away! [11] The further collapse of the fragments led to the formation of dense cores 0.010.1parsec (2,00020,000AU) in size. An athlete throws a discus from rest to a final angular the rope is, The mean orbital radius of the earth around the sun is. Moons have come to exist around most planets and many other Solar System bodies. only shortens Earth's average radius by 0.17% and Mount Everest (8,848 meters or 29,029 feet above local sea level) lengthens it by . [71][72][73], Gravitational disruption from the outer planets' migration would have sent large numbers of asteroids into the inner Solar System, severely depleting the original belt until it reached today's extremely low mass. That fact demonstrates that each day, the Earth travels roughly 1 in its orbit. The figure appears in multiple references, and is derived from the VSOP87 elements from section 5.8.3, p.675 of the following: National Aeronautics and Space Administration, "Solar Energy Reaching The Earth's Surface", "The Earth as an Object of Astrophysical Interest in the Search for Extrasolar Planets", Earth Speed through space about 1 million miles an hour, https://en.wikipedia.org/w/index.php?title=Earth%27s_orbit&oldid=1129399934, Articles with unsourced statements from January 2010, Articles with unsourced statements from November 2021, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 25 December 2022, at 04:17. Now connect to a tutor anywhere from the web. Or whether the Earth goes around the Sun. [54] The cumulative action of the resonances and the embryos either scattered the planetesimals away from the asteroid belt or excited their orbital inclinations and eccentricities. Estimate the mass of the Sun.Doubtnut % , :-https://doubtnut.app.link/91GzfmKxjPOR ask your doubts on Whatsapp No --- 8400400400Physics Solutions for Class 9, class 10, class 11, class 12 and IIT-JEE aspirantsDoubtnut provides Physics Solutions for Class 9, class 10, class 11, class 12 and IIT-JEE aspirants. If the radius of, The angular momentum of earth revolving round the sun is proportional to r^n , where r is the, In accordance with the Bohrs model, find the quantum number that characterises the earths, The minimum and maximum distances of a satellite form the centre of the earth are 2R and 4R, A particle of mass m is thrown upwards from the surface of the earth. [132] After a further series of glancing blows, during which the likelihood of the Solar System's ejection rises to 30%,[133] the galaxies' supermassive black holes will merge. [according to whom? Science X Daily and the Weekly Email Newsletters are free features that allow you to receive your favourite sci-tech news updates. For an observer at a northern latitude, when the north pole is tilted toward the Sun the day lasts longer and the Sun appears higher in the sky. Within 50 million years, the temperature and pressure at the core of the Sun became so great that its hydrogen began to fuse, creating an internal source of energy that countered gravitational contraction until hydrostatic equilibrium was achieved. The Earth's kinetic energy is (mv^2)/2 in its orbit about the sun. These are the characteristics expected of captured bodies. The Earth completes one orbit every. Thus the seasonal effects in the south are reversed. What is the angular diameter of the Sun? . [91] The moons of trans-Neptunian objects Pluto (Charon) and Orcus (Vanth) may also have formed by means of a large collision: the PlutoCharon, OrcusVanth and EarthMoon systems are unusual in the Solar System in that the satellite's mass is at least 1% that of the larger body. Substituting into the first equation, we find the orbital velocity: The radial acceleration of the Earth toward the sun, which corresponds to the centripetal acceleration, is, This site is using cookies under cookie policy . [d] In both cases, tidal deceleration causes the moon to spiral in towards the primary until it either is torn apart by tidal stresses, potentially creating a planetary ring system, or crashes into the planet's surface or atmosphere. The radial acceleration of the Uranus towards the sun, corresponding to centripetal acceleration. . [43][67], In contrast to the outer planets, the inner planets are not thought to have migrated significantly over the age of the Solar System, because their orbits have remained stable following the period of giant impacts. [125] Afterwards, all that will remain of the Sun is a white dwarf, an extraordinarily dense object, 54% its original mass but only the size of the Earth. Orbital radius of the Earth around the Sun, r = 1.5 10 11 m Time taken by the Earth to complete one revolution around the Sun, T = 1 year = 365.25 days = 365.25 24 60 60 s Universal gravitational constant, G = 6.67 10 -11 Nm 2 kg -2 Thus, mass of the Sun can be calculated using the relation, Hence, the mass of the Sun is 2 10 30 kg. [c] Those objects scattered by Jupiter into highly elliptical orbits formed the Oort cloud;[43] those objects scattered to a lesser degree by the migrating Neptune formed the current Kuiper belt and scattered disc. [2][74] This period of heavy bombardment lasted several hundred million years and is evident in the cratering still visible on geologically dead bodies of the inner Solar System such as the Moon and Mercury. [5] However, since the early 1980s studies of young stars have shown them to be surrounded by cool discs of dust and gas, exactly as the nebular hypothesis predicts, which has led to its re-acceptance. For part of its red-giant life, the Sun will have a strong stellar wind that will carry away around 33% of its mass. The acceleration of the earth is while the acceleration of the Uranus is . Your email address is used only to let the recipient know who sent the email. [3], Ideas concerning the origin and fate of the world date from the earliest known writings; however, for almost all of that time, there was no attempt to link such theories to the existence of a "Solar System", simply because it was not generally thought that the Solar System, in the sense we now understand it, existed. and Terms of Use. Earth is orbited by one permanent natural satellite, the Moon, which orbits . for Board \u0026 higher studies.Doubtnut (IIT JEE ) NCERT / / / / - 5 Doubtnut Doubtnut App and website has video solutions of all the NCERT questions from Class 6 to 12. Earth's orbit has an eccentricity of less than 0.02, which means that it is very close to being circular. Since its formation, the Solar System has completed at least 20 such revolutions. At this point, all life will be reduced to single-celled organisms. [34], When the terrestrial planets were forming, they remained immersed in a disk of gas and dust. Uranus and Neptune are thought to have formed after Jupiter and Saturn did, when the strong solar wind had blown away much of the disc material. The helium-fusing stage will last only 100million years. It is the standard unit of measurement for interplanetary distances. Still, in some cases, the orbits themselves may change dramatically. Ultimately, over the course of tens of billions of years, it is likely that the Sun will be left with none of the original bodies in orbit around it. The plane of Earth's orbit around the Sun. [98] Another example is Earth's axial tilt, which, due to friction raised within Earth's mantle by tidal interactions with the Moon (see below), is incomputable from some point between 1.5 and 4.5 billion years from now. Neither your address nor the recipient's address will be used for any other purpose. This future development may be similar to the observed detection of MOA-2010-BLG-477L b, a Jupiter-sized exoplanet orbiting its host white dwarf star MOA-2010-BLG-477L. In these cases, the tidal bulge lags behind the moon in its orbit. We also know that it takes a year (approx 365 days) which is therefore about 3.2x10 7 secs. One hypothesis supposes that vertical oscillations made by the Sun as it orbits the Galactic Centre cause it to regularly pass through the galactic plane. to get the kinetic energy you will need this formula ke=1/2mv^2 then i have calculated that the total Earth's kinetic energy by spinning is 4.8x10^29 joules if we can think of a way to tap the Earth's kinetic energy. [33], The inner Solar System, the region of the Solar System inside 4AU, was too warm for volatile molecules like water and methane to condense, so the planetesimals that formed there could only form from compounds with high melting points, such as metals (like iron, nickel, and aluminium) and rocky silicates. Main-sequence stars derive energy from the fusion of hydrogen into helium in their cores. Eventually, it will have to again resort to the reserves of hydrogen and helium in its outer layers. . 48. Uranus and Neptune are sometimes referred to as failed cores. (a) Calculate the period of revolution of the asteroid in years. In that case, the tidal bulge stays directly under the moon, there is no angular momentum transfer, and the orbital period will not change. Such chaos manifests most strongly as changes in eccentricity, with some planets' orbits becoming significantly moreor lesselliptical. The Sun likely drifted from its original orbital distance from the center of the galaxy. This cluster began to break apart between 135 million and 535 million years after formation. For the word puzzle clue of orbital radius of earth around sun, the Sporcle Puzzle Library found the following results. Water delivered to Earth. sun. [26] These discs extend to several hundredAUthe Hubble Space Telescope has observed protoplanetary discs of up to 1000AU in diameter in star-forming regions such as the Orion Nebula[27]and are rather cool, reaching a surface temperature of only about 1,000K (730C; 1,340F) at their hottest. [118] They will continue to orbit their star, their speed slowed due to their increased distance from the Sun and the Sun's reduced gravity. In the figure shown are two blocks, they travel at constant speeds, how far from the turning will the jeep catch up with the bike? What is the radial acceleration of the Mercury? [42] The main problem with formation theories for these planets is the timescale of their formation. planet or sun). [7] In 1935, Eddington went further and suggested that other elements also might form within stars. [8] Since the southern hemisphere is tilted toward the Sun at about the same time that the Earth reaches the closest approach to the Sun, the southern hemisphere receives slightly more energy from the Sun than does the northern over the course of a year. Calculate the mass of the sun if G=6.67 \times 10^{-The world's only live instant tutoring platform. [86][87] Most such moons orbit in the direction opposite the rotation of their primary. Determine the [113] If it were only for this, Venus and Earth would probably escape incineration,[118] but a 2008 study suggests that Earth will likely be swallowed up as a result of tidal interactions with the Sun's weakly-bound outer envelope. It will expand a second time, becoming what is known as an asymptotic giant. [1] Studies of ancient meteorites reveal traces of stable daughter nuclei of short-lived isotopes, such as iron-60, that only form in exploding, short-lived stars. To eject an object from the Solar System, Jupiter transfers energy to it, and so loses some of its own orbital energy and moves inwards. Thus, the acceleration of the Uranus is . [76], Impacts are thought to be a regular (if currently infrequent) part of the evolution of the Solar System. Now connect to a tutor anywhere from the web . In other words; T^2 prop R^3 Where T is the orbital period and R is the body's average distance from the sun, or the semi-major axis. What is the shape of Earth's orbit around the Sun? [65][2][43], According to the Nice model, after the formation of the Solar System, the orbits of all the giant planets continued to change slowly, influenced by their interaction with the large number of remaining planetesimals. , Repeat parts (a) and (b) for the motion of the planet Mercury orbital period = 88.0 days2. The Solar System will continue to evolve until then. [77][78], Over the course of the Solar System's evolution, comets were ejected out of the inner Solar System by the gravity of the giant planets and sent thousands of AU outward to form the Oort cloud, a spherical outer swarm of cometary nuclei at the farthest extent of the Sun's gravitational pull. [30], As the early Solar System continued to evolve, it eventually drifted away from its siblings in the stellar nursery, and continued orbiting the Milky Way's center on its own. Identify the news topics you want to see and prioritize an order. [64] Originally, however, the Kuiper belt was much denser and closer to the Sun, with an outer edge at approximately 30AU. [113] This will cause the outer layers of the star to expand greatly, and the star will enter a phase of its life in which it is called a red giant. Orbital radius of the Earth around the Sun, r=1.510 11 m Time taken by the Earth to complete one revolution around the Sun, T=1 year=365.25 days =365.25246060s Universal gravitational constant, G=6.6710 11 Nm 2kg 2 Thus, mass of the Sun : M= GT 24 2r 3 = 6.6710 11(365.25246060) 243.14 2(1.510 11) 3 210 30 kg The chemical history of the Sun suggests it may have formed as much as 3kpc closer to the galaxy core. The currently accepted method by which the planets formed is accretion, in which the planets began as dust grains in orbit around the central protostar.Through direct contact and self-organization, these grains formed into clumps up to 200 m (660 ft . As the large bodies moved through the crowd of smaller objects, the smaller objects, attracted by the larger planets' gravity, formed a region of higher density, a "gravitational wake", in the larger objects' path. [2] [81] Moons around some asteroids currently can only be explained as consolidations of material flung away from the parent object without enough energy to entirely escape its gravity.[82]. The gas was partially supported by pressure and so did not orbit the Sun as rapidly as the planets. We know the Earth goes round the Sun, all the way around is 2 radians (360 degrees). History of Solar System formation and evolution hypotheses, "Origin of the cataclysmic Late Heavy Bombardment period of the terrestrial planets", "Birth of the planets: The Earth and its fellow planets may be survivors from a time when planets ricocheted around the Sun like ball bearings on a pinball table", "Triggered Star Formation inside the Shell of a WolfRayet Bubble as the Origin of the Solar System", "Lecture 13: The Nebular Theory of the origin of the Solar System", "The supernova trigger for formation of the solar system", "Iron 60 Evidence for Early Injection and Efficient Mixing of Stellar Debris in the Protosolar Nebula", "Slow-Moving Rocks Better Odds That Life Crashed to Earth from Space", "Magnetic Star-Disk Coupling in Classical T Tauri Systems", "Stardust Results in a Nutshell: The Solar Nebula was Like a Blender", "The Primordial Excitation and Clearing of the Asteroid Belt", "Linking the collisional history of the main asteroid belt to its dynamical excitation and depletion", "Pumping of a Planetesimal Disc by a Rapidly Migrating Planet", Monthly Notices of the Royal Astronomical Society, "The primordial excitation and clearing of the asteroid beltRevisited", "A Population of Comets in the Main Asteroid Belt", "Source regions and timescales for the delivery of water to the Earth", "Uranus, Neptune, and the Mountains of the Moon", "Origin of the orbital architecture of the giant planets of the Solar System", "Jupiter may have robbed Mars of mass, new report indicates", "UCLA scientists strengthen case for life more than 3.8 billion years ago", "The Risk to Civilization From Extraterrestrial Objects and Implications of the Shoemaker-Levy 9 Comet Crash", "Neptune's capture of its moon Triton in a binary-planet gravitational encounter", "Interplanetary Weathering: Surface Erosion in Outer Space", Eos, Transactions, American Geophysical Union, "The origin and evolution of stony meteorites", "The Giant Planet Satellite and Moon Page", "Origin of the moonThe collision hypothesis", "A Jovian analogue orbiting a white dwarf star", "A Crystal Ball Into Our Solar System's Future - Giant Gas Planet Orbiting a Dead Star Gives Glimpse Into the Predicted Aftermath of our Sun's Demise", "Astronomers Found a Planet That Survived Its Star's Death - The Jupiter-size planet orbits a type of star called a white dwarf, and hints at what our solar system could be like when the sun burns out", "Numerical evidence that the motion of Pluto is chaotic", "The solar system could go haywire before the sun dies", "Tidal Heating of Io and orbital evolution of the Jovian satellites", "Improved estimate of tidal dissipation within Mars from MOLA observations of the shadow of Phobos", "Measurement and implications of Saturn's gravity field and ring mass", "Introduction to Cataclysmic Variables (CVs)", "Titan under a red giant sun: A new kind of "habitable" moon", "Planetary nebulae and the future of the Solar System", "The Potential of White Dwarf Cosmochronology", "Period of the Sun's Orbit around the Galaxy (Cosmic Year)", "When Our Galaxy Smashes Into Andromeda, What Happens to the Sun?
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