Astronomy Test

Earth's revolution around the Sun takes ...

• 1 day/24 hours

• 1 year/365 days

• 12 hours

• 3 months

One rotation on Earth takes ...

• 24 hours/1 day

• 365 days/1 year

• 3 months

• 12 hours

The imaginary line that goes through the center of a moon or planet

• orbit

• revolution

• rotation

• axis

When a planet or moon spins one time on its axis

• Orbit

• Revolution

• Rotation

• Axis

When a planet or moon travels once around another object

• orbit

• axis

• rotation

• revolution

Gravity keeps Earth from ...

• flying off into space

• being pulled into the Sun

• running out of energy

• exploding

The amount of gravitational force an object has depends on its ...

• mass and weight

• weight and distance from another object

• just mass

• mass and distance from another object

An object in motion will stay in motion unless another force stops it

• inertia

• gravity

• friction

• power

Inertia keeps Earth from ...

• flying off into space

• being pulled into the Sun by the Sun's gravity

• running out of energy

• moving

The force that pulls/attracts one object to another

• inertia

• friction

• gravity

• power