Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune
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15
What is the center of our solar system?
The sun
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What are some smaller objects found in the solar system?
Asteroids and comets
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How did the planets form according to scientists?
Rock, ice, and gas pulled together due to gravity to form planetesimals which collided with each other to form all other solar system objects
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What is the distance of one AU?
The average distance between Earth and the sun; about 150,000,000 kilometers
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How does the size of our sun compare to the size of other stars?
It is midsized; there are stars that have volumes a thousand times greater than the sun
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Why are the inner planets small and rocky?
Their proximity to the sun made them warm, so ice didn't form. They have low mass, so their gravity was too weak to hold light gases like hydrogen and helium
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How much of the mass of the solar system is contained within the sun?
About 99.85%
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How do scientists think the solar system formed?
A cloud of hydrogen, helium, rock, ice, and other materials pulled together by gravity
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How old do scientists think the solar system is?
4.6 billion years old
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What is a planet?
A round object that orbits the sun and has cleared out the region of the solar system along its orbit
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What objects make up the solar system?
The sun, the planets and their moons, and a variety of smaller objects