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Astronomy Review - Cockeysville Middle
Astronomy Review - Cockeysville Middle

... The outer planets have lower densities (as you would expect since they are gas). There is no pattern of rotational periods (Day Length). The outer planets all have rings and multiple moons. ...
02 - University of New Mexico
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Earth and Space - D`Nealian Print
Earth and Space - D`Nealian Print

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... LAW #3: The square of a planet’s sidereal period around the Sun is directly proportional to the cube of its semi-major axis. This law relates the amount of time for the planet to complete one orbit around the Sun to the planet’s average distance from the Sun. If we measure the orbital periods (P) in ...
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... Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Saturn, along with Jupiter, Uranus and Neptune, is classified as a gas giant. Saturn is named after the Roman god Saturnus, equated to the Greek Kronos . The planet Saturn is composed of hydrog ...
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Solar System 2B - St-Roberts-Student-Work

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...  Earth – third planet from the Sun  More than 70 percent of surface is covered with water  Atmosphere consists of several layers, is mostly composed of nitrogen and oxygen, and protects the surface from meteors and Sun’s radiation  It is an average of 93 million miles away from the sun, and comp ...
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File - Miss S. Harvey
File - Miss S. Harvey

... results when Earth is positioned between the Sun and the Moon such that Earth casts its shadow on the surface of the Moon; the Moon must be at a node the points at which the Moon’s orbital plane intersects Earth’s orbital plane; eclipses occur only at lunar nodes the alternate rising and falling of ...
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Definition of planet



The definition of planet, since the word was coined by the ancient Greeks, has included within its scope a wide range of celestial bodies. Greek astronomers employed the term asteres planetai (ἀστέρες πλανῆται), ""wandering stars"", for star-like objects which apparently moved over the sky. Over the millennia, the term has included a variety of different objects, from the Sun and the Moon to satellites and asteroids.By the end of the 19th century the word planet, though it had yet to be defined, had become a working term applied only to a small set of objects in the Solar System. After 1992, however, astronomers began to discover many additional objects beyond the orbit of Neptune, as well as hundreds of objects orbiting other stars. These discoveries not only increased the number of potential planets, but also expanded their variety and peculiarity. Some were nearly large enough to be stars, while others were smaller than Earth's moon. These discoveries challenged long-perceived notions of what a planet could be.The issue of a clear definition for planet came to a head in 2005 with the discovery of the trans-Neptunian object Eris, a body more massive than the smallest then-accepted planet, Pluto. In its 2006 response, the International Astronomical Union (IAU), recognised by astronomers as the world body responsible for resolving issues of nomenclature, released its decision on the matter. This definition, which applies only to the Solar System, states that a planet is a body that orbits the Sun, is massive enough for its own gravity to make it round, and has ""cleared its neighbourhood"" of smaller objects around its orbit. Under this new definition, Pluto and the other trans-Neptunian objects do not qualify as planets. The IAU's decision has not resolved all controversies, and while many scientists have accepted the definition, some in the astronomical community have rejected it outright.
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