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Planets of Our Solar System
Planets of Our Solar System

... to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, (c) has not cleared the neighborhood around its orbit, and (d) is not a satellite. (3) All other objects except satellites orbiting the Sun shall be referred to collectively as "Small Solar-System Bodies ...
Interesting Science Facts - Comets
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... Short-period comets originate in the Kuiper Belt. Kuiper Belt is a region of the Solar System beyond the planets extending from the orbit of Neptune to approximately 55 AU (astronomical units) from the Sun. ...
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... Where Do Comets Come From? *Many scientists think they come from a spherical region called the Oort cloud that surrounds the solar system. The gravity of a passing planet or star disturbs part of this cloud and comets are pulled in toward the sun. ...
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... bodies lack atmosphere and have weak surface gravity. The largest of the small bodies are known as dwarf planets. A dwarf planet is a celestial body that orbits the sun and is round because of its own gravity, but it does not have the mass to have cleared other bodies out of its orbit around the sun ...
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... 2. Draw and label a picture of a comet. Include: the sun, nucleus, coma and tails. ...
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...  Asteroid/Meteorites are rocky/metallic objects • Comets would have been a source of water on the Earth • Comets originate in either (i) the Oort Cloud at the edge of the solar system, or (ii) the Kuiper Belt beyond the orbit of Pluto ...
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... List all the planets and dwarf planets from closest to farthest from the sun What does it mean when astronomers speak of a planet having “cleared all of its orbit”? Why is there an asteroid belt between Mars and Jupiter? What are the three original sources of most meteorites? Why can meteorites most ...
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... Kuiper belt is thought to be material left over from the formation of the solar system. The Kuiper belt lies on the same plane as the disc of our solar system. ...
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Oort cloud



The Oort cloud (/ˈɔrt/ or /ˈʊərt/) or Öpik–Oort cloud, named after Dutch astronomer Jan Oort and Estonian astronomer Ernst Öpik, is a theoretical spherical cloud of predominantly icy planetesimals believed to surround the Sun at a distance of up to around 100,000 AU (2 ly). This places it at almost half of the distance to Proxima Centauri, the nearest star to the Sun, and in interstellar space. The Kuiper belt and the scattered disc, the other two reservoirs of trans-Neptunian objects, are less than one thousandth as far from the Sun as the Oort cloud. The outer limit of the Oort cloud defines the cosmographical boundary of the Solar System and the region of the Sun's gravitational dominance.The Oort cloud is thought to comprise two regions: a spherical outer Oort cloud and a disc-shaped inner Oort cloud, or Hills cloud. Objects in the Oort cloud are largely composed of ices, such as water, ammonia, and methane.Astronomers conjecture that the matter composing the Oort cloud formed closer to the Sun and was scattered far into space by the gravitational effects of the giant planets early in the Solar System's evolution. Although no confirmed direct observations of the Oort cloud have been made, it may be the source of all long-period and Halley-type comets entering the inner Solar System, and many of the centaurs and Jupiter-family comets as well. The outer Oort cloud is only loosely bound to the Solar System, and thus is easily affected by the gravitational pull both of passing stars and of the Milky Way itself. These forces occasionally dislodge comets from their orbits within the cloud and send them towards the inner Solar System. Based on their orbits, most of the short-period comets may come from the scattered disc, but some may still have originated from the Oort cloud.
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