Front

The unit of astronomical distance that equals the distance light travels in one year is known as a __________.

Back

lightyear

Front

The spinning of a planet on its axis is called __________.

Back

rotation

Front

Gravity can best be described as a force that __________.

Back

pulls objects down towards the center of the Earth.

Front

How long does it take the Earth to revolve around the Sun once? __________.

Back

365 days

Front

How long does it take for Earth to complete one full rotation? __________.

Back

24 hours

Front

The path that a planet takes as it revolves around the Sun is called its __________.

Back

orbit

Front

The force that keeps planets in orbit around the Sun is known as __________.

Back

gravity

Front

The time it takes for the Earth to complete one full revolution around the Sun is known as a __________.

Back

year

Front

The tilt of the Earth's axis is responsible for __________.

Back

the changing seasons.

Front

The term for the distance from the center of a planet to its surface is called __________.

Back

radius