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... By far the smallest planet. Not a gas giant like other outer planets. Has an icy composition like a comet. Has a very elliptical, inclined orbit. Pluto has more in common with comets than with the eight major planets ...
Integrative Studies 410 Our Place in the Universe
Integrative Studies 410 Our Place in the Universe

... when and for how long in the Hertzsprung-Russell ...
Exploring the Outer Solar System Jane Luu When I was
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... than 200 yrs to go around the Sun) originated in the Oort cloud, a large, spherical cloud located at roughly 50,000 AU (Oort 1950). Based on the long-period comets’ large, randomly oriented orbits, Oort inferred that they comets must come from a spherical cloud of comets about 105 AU away. At this k ...
printer-friendly sample test questions
printer-friendly sample test questions

... 1st Item Specification: Recognize the difference between moons, asteroids, and comets. Depth of Knowledge Level 1 1. Each of the following are objects found in our solar system EXCEPT A. quasars. B. comets. C. asteroids. D. planets. 2. Planets known to have rings include each of the following EXCEPT ...
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... •! These large, icy objects have orbits similar to the smaller objects in the Kuiper Belt that become short period comets •! So are they very large comets or very small planets? ...
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... QuickTime™ and a TIFF (Uncomp resse d) de co mpres sor a re ne eded to see this picture . ...
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Arguments for the presence of a distant large
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Arguments for the presence of a distant large undiscovered Solar
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... Comets formed at the same time our solar system did, 4.6 billion years ago, perhaps even in among the planets. By examining them up close with satellites and landers, scientists hope to learn more about what our Solar System looked like in its earliest days. ...
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... • The big variability of D/H in comets points to the fact that they were formed over a large region, that the comet families (Oort cloud, Kuiper belt, etc.) were not formed separately, but just have a dynamically different history • The Earth did not get the bulk of its water from comets ...
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... Which of these facts is NOT explained by the nebular theory? a)  There are two main types of planets: terrestrial and jovian. b)  Planets orbit in same direction and plane. c)  Existence of asteroids and comets. d)  Number of planets of each type (4 terrestrial and 4 jovian). ...
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... August 30, 1992, we were taking the third of a four-exposure sequence while blinking the first two images on a computer. We noticed that the position of one faint “star” appeared to move slightly between the successive frames. We both fell silent. The motion was quite subtle, but it seemed definite. ...
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... Because you asked…….. The next visible comet is Comet Faye. Comet Faye's last perihelion was on November 15, 2006. It reached an apparent magnitude of 9.5 during that orbit. The orbital period of Comet Faye is 7.55 years Its next perihelion will occur on May 29, 2014. During this next appearance, i ...
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... or less to make one orbit around the Sun. These are called short-period comets. Comets also come from their other hangout, the Oort Cloud. The Oort Cloud is a far-fardistance cloud of possibly a trillion comets that surrounds the Solar System. One trip around the Sun could take one of these comets 3 ...
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... It is a peculiarity of comets that no matter where the comet is headed, the tail always points away from the Sun. Comets can also have two tails, one is of mostly dust, the other gas. Meteors: Remember all that dust and dirt the comets give off? It does not disappear, but continues to orbit the Sun ...
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Chapter 2 - The Solar System

... Most comets have highly eccentric orbits which take them far beyond the orbit of Pluto; these are seen once and then disappear for millennia. Only the short- and intermediate-period comets (like Comet Halley), stay within the orbit of Pluto for a significant fraction of their orbits. ...
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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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