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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15
Which two planets have more than sixty moons?
Jupiter and Saturn
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What are some smaller objects found in the solar system?
Asteroids and comets
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Which two planets have no natural satellites?
Mercury and Venus
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What does AU stand for?
Astronomical Unit
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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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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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How much of the mass of the solar system is contained within the sun?
About 99.85%
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boom
Lose 50 points!
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seesaw
Swap points!
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gift
Win 15 points!
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thief
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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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banana
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shark
Other team loses 20 points!
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fairy
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thief
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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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What objects make up the solar system?
The sun, the planets and their moons, and a variety of smaller objects