What is the main reason humans have not traveled to any other planets in our solar system?

• Lack of interest in space travel

• The size and distance of other planets

• No technology to build rockets

• Planets are too hot

Which object is the largest in our solar system?

• Earth

• Jupiter

• The Sun

• Saturn

If the sun were the size of a basketball, what would be the size of Earth?

• A tennis ball

• A grain of rice

• A pinhead

• A marble

How many planets are there in our solar system?

• Six

• Seven

• Eight

• Nine

What is the smallest planet in our solar system?

• Mars

• Mercury

• Venus

• Neptune

If Earth were hollow, about how many Moons would fit inside it?

• 10

• 25

• 49

• 100

Which moon is the largest in our solar system?

• Earth's Moon

• Titan

• Ganymede

• Europa

Why are some objects in the solar system hard to imagine?

• They are invisible

• They are very far away

• They are so big

• They move too fast

Which planet is closest to the sun?

• Venus

• Earth

• Mercury

• Mars

How far is Neptune from the sun?

• 57 million kilometers

• 149 million kilometers

• 4.5 billion kilometers

• 1 billion kilometers