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Name the four inner planets
mercury, Venus, Earth, Mars
What compound is 97% of the atmosphere of Venus?
Carbon dioxide
Why does mercury have no atmosphere?
It's gravity is too weak to hold gases close to the surface of the planet
What makes up 99% of the mass of the solar system
The sun
Which planet is known as the red planet?
Mars
What causes the change between night and day?
rotation of the Earth
Why is the moon not a planet?
orbits the Earth, is not the largest body near it
What is Jupiter made of?
Hydrogen and Helium
Name the four outer planets
Jupiter, Saturn, Uranus,Neptune
How many moons does Mars have?
2
How long does it take for Earth to complete 1 revolution
365 days
Which is the smallest planet in the solar system?
Mercury
