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smallest planet, closest to the sun; Does not have a true atmosphere. Has a surface with many craters and high cliffs.
second planet from the Sun; has a thick atmosphere with high temperatures, a surface with craters, faultlike cracks, and volcanoes; sometimes called Earth's twin
third planet from the sun; has an atmosphere that protects life and surface temperatures that allow water to exist as a solid, liquid, and gas
largest and fifth planet from the Sun; contains more mass than all the other planets combined, has continuous storms of high-pressure gas, and an atmosphere mostly of hydrogen and helium
second-largest and sixth planet from the Sun; has a complex ring system, at least 31 moons, and a thick atmosphere made mostly of hydrogen and helium
seventh planet from the Sun; is large and gaseous, has a distinct bluish-green color, and rotates on an axis nearly parallel to the plane of its orbit
usually the eighth planet from the Sun; is large and gaseous, has rings that vary in thickness, and is bluish-green in color
considered to be the ninth planet from the Sun; has a solid icy-rock surface and a single moon, Charon
space object made of dust and rock particles mixed with frozen water, methane, and ammonia that forms a bright coma as it approaches the Sun
a piece of rock or metal made up of material similar to that which formed the planets; mostly found in the asteroid belt between the orbits of Mars and Jupiter
What is the shape of planetary orbits?
Elliptical; in 1600's German mathmatician Kepler studied the orbits of the planets discovering that the orbits were oval shaped and the Sun is no at the Center of the orbits but is slightly offset.
Which planet has extreme temperatures because it has no atmosphere?
Mercury; Because of it's low gravitational pull and high daytime temperatures, most atmospheric gaes escape into space.
Which planet has a complex ring system consisting of thousands of ringlets?
Saturn; Saturn has several broad rings. Each large ring is composed of thousands of thin ringlets. The rings are composed of countless ice and rock particles.
Which planet has the highest temperature because of the greenhouse effect?
Venus; Clouds on Venus are so dense that only a small amount of sunlight reaches the planets surface. The sunlight that does get through warms the surface, which gives off heat to the atmosphere. Most of this heat is absorbed by carbon dioxide gas in Venus's atmosphere, causing the Greenhouse Effect.
List the order of the planets...
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto
What is one of the main differences between the inner and outer planers?
The inner planets are terrestrial
What caused the dense cloud scientists hypothesize created our solar system to increase in temperature as it condensed?
Why do planets closer to the Sun orbit the Sun faster than planets farther away do?
Because of the Sun's gravity
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