planets

The four inner planets are rocky and small. Which description best fits the next four outer planets?

• They are also rocky and small.

• They are very large and made of ice.

• They are small and made of ice.

• They are very large and made of gases.

What is a special characteristic of Jupiter, Saturn, Neptune and Uranus?

• They are planets in our solar system.

• They spin slowly.

• They revolve around the sun.

• They have rings.

How does a telescope help us understand the moon?

• It tells us how it was formed.

• It tells us how hot it is there.

• It helps us see surface features.

• It can tell us what the moon is made of.

Why is space travel difficult for people?

• We cannot take the air or food we need into space.

  
  

• The distances are very great; it is dangerous and expensive.

• It is impossible to escape the sun’s or Earth’s gravity.

• We do not have a destination to visit that we know will support life.

What holds the planets in their orbits around the sun?

• gravity

• speed

• string

• air currents

Which object has the most gravity?

• Earth

  
  

• moon

• Jupiter

• sun

What do planets revolve around?

• each other

• a star or sun

• a moon

• a galaxy

If you could live on Jupiter, what would you see in the sky at night besides stars?

• many moons

• the inner planets

• the sun

• Earth’s moon

Mary looked in her science book at a picture of the solar system. The planets were large and colorful, but she knew it was not an accurate model. Why?

• The planets should have been much farther apart.

• The planets are not colorful. They are white.

• We don’t know exactly what the planets look like, so it was a guess.

• Planets are oval and not round.

Which of the following instruments could best see the rings on Saturn?

• your eye

• binoculars

• a telescope

• a magnifying glass