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The Synodic and Orbit Periods of the Planets
The Synodic and Orbit Periods of the Planets

... Copernicus thought of the planets as orbiting the sun rather than the Earth. Well then, what should he do with the Earth? Well, have it orbit the sun also! In Copernicus' model, if the planet has an elongation angle which is always smaller than 180 degrees, then it is an inferior planet (orbit radiu ...
Chapter3 - The Science of Astronomy-ppt
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(Lecture 3). The Solar System in the Night Sky (cont)
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... calculations were wrong, and Pluto, turned out to be smaller than Earth's Moon — too small to account for the perturbations, in any case. In June 1978, James W. Christy noticed that in one image, Pluto's point of light seemed to have a bump on it. He went back and looked at other photographs and Plu ...
Introduction to Lookback
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... display before we hear the loud bang that it makes. When there is a thunderstorm, we see the lightning and then, a few seconds later, we hear the thunder. That is because sound travels at “only” 1,236 kilometers per hour (343 meters per second, 767 miles per hour, 1,125 feet per second [at sea level ...
Solar System
Solar System

... Submitted by Your Name To Instructor Saunders AS101 – Fall 2003 ...
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... Submitted by Your Name To Instructor Saunders AS101 – Fall 2003 ...
New Scientist Magazine - Surrey, England… 19th November 2008
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... Wanted: Rocky planet outside of our solar system. Must not be too hot or too cold, but just the right temperature to support life. It sounds like a simple enough wish list, but finding a planet that fulfils all of these criteria has kept astronomers busy for decades. Until recently, it meant finding ...
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Earth Science - MrsHeatonsWiki
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... ago because these objects looked like planets through small optical telescopes. Rather, a planetary nebula is a stage of life that our Sun will experience billions of years from now (see illustration below). ...
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INSTITUCIÓN EDUCATIVA LOS GÓMEZ PLAN DE APOYO FECHA
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... between the orbits of the planets Mars and Jupiter. The asteroid belt contains irregularly shaped bodies called asteroids which are believed to be left over from the beginning of the solar system 4.6 billion years ago. The objects are rocky and irregular in shape, and some may be hundreds of miles a ...
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... 5. If the hypothesis is true, the earth and the Vulcan must have the same period of rotation. But according to Kepler’s 3rd law, different planets in the same solar system have different orbits and so must have different periods of rotation. (Since T2  a3) 6. (a) On a celestial sphere, Mars general ...
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Chapter 17 and 18 Vocabulary Quist
Chapter 17 and 18 Vocabulary Quist

... 44. Our Sun is considered to be a star of this color ______________________ 45. When a star explodes, it is said to have gone __________________ or _______________________ 46. A star that is very small and has so much gravity that electromagnetic energy cannot escape its surface is called a ________ ...
Light Years Away - Sitka School District
Light Years Away - Sitka School District

... The star outside of our solar system that is closest to us is Alpha Centauri C, also called Alpha Proxima. It is 40,000,000,000,000 (40 trillion) km away. How many light years is that? ...
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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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