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Correct Answer: B) Copernicus.
Correct Answer: B) The solar system is so big and the objects in it are so small in comparison.
Correct Answer: A) Oxygen.
Correct Answer: A) Mercury.
Correct Answer: B) Mercury, Venus, Earth, Mars.
Correct Answer: A) Saturn.
Correct Answer: B) Ganymede.
Correct Answer: D) Mercury.
Correct Answer: B) Moon.
Correct Answer: D) Meter Stick.
Correct Answer: D) It doesn't have enough gravity to keep an atmosphere.
Correct Answer: C) It has other objects in its area of orbit.
Correct Answer: C) The average distance from Earth to the Sun.
Correct Answer: A) Jupiter.
Correct Answer: C) Jupiter, Saturn, Uranus, Neptune.
Correct Answer: C) Solar system.
Correct Answer: A) What is the soil like on Mars?.
Correct Answer: A) It appears to be on its side because its axis is so tilted.
Correct Answer: A) Comet.
Correct Answer: D) Heliocentric model.
Correct Answer: A) Neptune.
Correct Answer: B) Earth.
Correct Answer: B) Rock.
Correct Answer: C) The cloud was spinning.