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14-1 History of Solar System Study
14-1 History of Solar System Study

... Heliocentric – The sun in the center, planets revolve around it. This is correct ...
Our Solar System
Our Solar System

... ...
Solar System has 8 planets instead of 9 — IAU official vote
Solar System has 8 planets instead of 9 — IAU official vote

... and brought three other objects into the cosmic club. Pluto has been considered a planet since its discovery in 1930 by the American Clyde Tombaugh. The ninth planet will now effectively be airbrushed out of school and university textbooks. “The eight planets are Mercury, Venus, Earth, Mars, Jupiter ...
Name:
Name:

... Earth’s atmosphere. When they strike the Earth’s surface they are called ________________________. A ________________ is a ball of ice, rock, and gas that has an orbit which brings it really close to the sun on one end, and sometimes much farther than Pluto on the other end. Which one of these objec ...
Chapter 9 Lesson 2
Chapter 9 Lesson 2

... Rings Around a Planet: Saturn’s rings have fascinated sky gazers since the astronomer Galileo first saw them in 1610. We’ve learned that the rings are made of rock, gas, and ice. ...
Science Study Guide Chapter 7
Science Study Guide Chapter 7

... 1. Apply: What will happen when the Sun’s supply of hydrogen is used up? 2. Analyze: Suppose you are playing a guessing game with a friend. She says that she is thinking of a planet that takes 84 Earth years to complete one revolution of the Sun. You know that Mars orbits the Sun in 687 days. Is you ...
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... • Mercury, Venus, Earth, and Mars • Earth - only one with water on the surface and can support life ...
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... The Solar System ...
Planet Definition - Porterville College Home
Planet Definition - Porterville College Home

... objects not satisfying these criteria are "satellites". Under this definition, Pluto's companion Charon is a planet, making Pluto-Charon a double planet.) (2) We distinguish between the eight classical planets discovered before 1900, which move in nearly circular orbits close to the ecliptic plane, ...
Planet Definition
Planet Definition

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... the force of gravity. Planet (from the Greek word meaning wanderer) Originally, they were little points of light that moved through the constellations. Now they are reasonably large objects that orbit the sun. Must be directly orbiting the sun to be a planet (i.e. moons) There are four inner earth-l ...
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Chapter 8 Lesson 3 The Solar System

... Smaller planets are called dwarf planets. Most are round and made of rock and ice. Their orbits cross the orbits of other objects. ...
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It`s a bird, it`s a plane…
It`s a bird, it`s a plane…

... • Planets must be round, orbit the sun, and not be close to objects of similar mass • Pluto’s moon, Charon, is almost the same size, which disqualifies Pluto from Planethood ...
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Inner planets

... Outer planets: they are further from the sun, large and made up mainly of light gases and ices Astronomers: scientists who study the universe Moon: a natural object that revolves around a planet (are called satellites) Asteroids: large pieces of space rock with irregular shapes most found in asteroi ...
astronomical: (meaning 1)
astronomical: (meaning 1)

... Mars Rover Lesson 1 Vocabulary List Teacher Definitions Key Vocabulary apply: use what you have learned in a different way, place or time astronomical: (meaning 1) of or pertaining to the study of stars planets and extraterrestrial matter (meaning 2) a very large number or amount scale: the ratio or ...
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... Jupiter is the solar system’s largest planet. Two Earth-sized circles could fit inside Jupiter’s Great Red Spot. ...
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... Mars , Earth , Venus , and Mercury. Those are the inner planets that are surrounded by the asteroid belt ...
Our Solar System - Mississippi University for Women
Our Solar System - Mississippi University for Women

... Be massive enough to form itself into a stable, almost spherical shape; Orbit a star; Have cleared its orbit of other bodies; Not have its orbit unduly interfered with by other planets ...
asteroid -- a large rock in outer space that orbits the sun (Many
asteroid -- a large rock in outer space that orbits the sun (Many

... asteroid -- a large rock in outer space that orbits the sun (Many asteroids are found in an asteroid belt between Mars and Jupiter.) astronomer -- a scientist who studies and observes space atmosphere -- the gases that surround a planet comet -- a frozen chunk of ice, dust, and gases that orbits the ...
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Space Worksheet

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Unit 4 5 vocabulary terms to define: Vocabulary Term Definition
Unit 4 5 vocabulary terms to define: Vocabulary Term Definition

... 2. Draw and label a picture of a comet. Include: the sun, nucleus, coma and tails. ...
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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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