What is gravity? Gravity is the force that ______ objects toward each other.

• pulls

• pushes

• ignores

• separates

Which of the following is an example of gravity?

• Gravity keeps your feet on the ground

• Gravity makes objects float in the air

• Gravity pushes objects away from the Earth

• Gravity has no effect on objects

Gravity acts between ______ objects, even if they are very far apart.

• all

• large

• moving

• charged

Larger objects have stronger gravity, or gravitational force.

• True

• False

Why don’t planets just fall into the Sun? Orbits cause a balance between gravity pulling in and ______ pushing forward.

• motion

• light

• heat

• sound

What keeps the planets in orbit around the Sun?

• The Sun’s gravity

• The Moon’s gravity

• The Earth’s gravity

• The planets’ own gravity

Earth’s gravity holds the ______ in orbit.

• Moon

• Sun

• Mars

• Clouds

Gravity holds stars and solar systems in orbit around the center of the galaxy.

• True

• False

The distance from the Sun to Mercury is _______ au and its diameter is _______ km.

• 0.39 au, 4,880 km

• 0.72 au, 12,104 km

• 1.00 au, 6,792 km

• 5.20 au, 142,984 km

The distance from the Sun to Venus is _______ au and its diameter is _______ km.

• 0.72 au, 12,104 km

• 1.00 au, 6,371 km

• 0.39 au, 6,779 km

• 5.20 au, 142,984 km