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PTYS/ASTR 206 – Section 2 – Fall 2004 Activity #1: 8/25/04
PTYS/ASTR 206 – Section 2 – Fall 2004 Activity #1: 8/25/04

... B) a rotating disk of dense gas surrounding a young newly formed star, like our Sun around the time the solar system formed C) another name for the asteroid belt that exists between the orbits of Mars and Jupiter D) the plane in which moons orbit their parent planet (e.g. Jupiter’s moons) 4. When Ve ...
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... Our Solar System consists of many types of objects circling around the Sun, held in their orbits by gravity. Name all of the objects you can think of that orbit the Sun. Write down what you know about each one. This activity will look specifically at planets, which are relatively large objects circl ...
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Name - CHS Room 124
Name - CHS Room 124

... 3. One asteroid belt, located between Mars and Jupiter 4. Dwarf planets, like Pluto (considered to be a planet for about 75 years!) 5. Many moons (Earth has only one, but Saturn, for example, has 25+) C. Planet Facts 1. Mercury- the closest planet to the sun, revolves around the Sun the fastest—once ...
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IAU definition of planet



The definition of planet set in Prague in 2006 by the International Astronomical Union (IAU) states that, in the Solar System, a planet is a celestial body which: is in orbit around the Sun, has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and has ""cleared the neighborhood"" around its orbit.A non-satellite body fulfilling only the first two of these criteria is classified as a ""dwarf planet"". According to the IAU, ""planets and dwarf planets are two distinct classes of objects"". A non-satellite body fulfilling only the first criterion is termed a ""small Solar System body"" (SSSB). Initial drafts planned to include dwarf planets as a subcategory of planets, but because this could potentially have led to the addition of several dozens of planets into the Solar System, this draft was eventually dropped. The definition was a controversial one and has drawn both support and criticism from different astronomers, but has remained in use.According to this definition, there are eight planets in the Solar System. The definition distinguishes planets from smaller bodies and is not useful outside the Solar System, where smaller bodies cannot be found yet. Extrasolar planets, or exoplanets, are covered separately under a complementary 2003 draft guideline for the definition of planets, which distinguishes them from dwarf stars, which are larger.
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