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PLANETS OF THE SOLAR SYSTEM
The inner planets are mostly rock and metal.
1. Mercury2. Venus3. Earth4. Mars
The outer planets are mostly gas and dust.
5. Jupiter 6. Saturn7. Uranus8. Neptune
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A planet is any body in orbit around the Sun that has enough gravity to form a sphere and that has cleared the neighborhood near its orbit of smaller objects.
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The Sun
The planets that are made of gas and dust are much bigger than the planets that are made of rock and metal.
Earth
Jupiter
Uranus
Which of the following planets is mostly rock and metal?
Saturn
Uranus
Mars
Saturn is made of gas and dust. Do you think it would be bigger or smaller than Mars?
Bigger than Mars
Smaller than Mars
Match each planet name to the diagram.
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Mercury
Saturn
Venus
NeptuneEarth
MarsUranus
Jupiter
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What is Neptune mostly made out of?
Metal and Rock
Dust and Gas
Astronomers are planning to define a new type of planet. This new type is a “plutoid” or “dwarf
planet.” Plutoids are not big enough to clear their
path of other objects. Pluto is a plutoid. So are Ceres, Eris,
Makemake, and Haumea.
Pluto is in orbit around the sun, but it has a smaller object in its immediate neighborhood.
Is it a planet?
Yes
No
Yes, but it’s a dwarf planet