The Inner Planets

Front

What is a space probe?

Back

A spacecraft that gathers data without a crew.

Front

What does the length of a planet's year relate to?

Back

The revolution of the planet around the Sun.

Front

Which inner planet has a thick, poisonous atmosphere?

Back

Venus.

Front

Which inner planet has seasons and polar ice caps?

Back

Mars.

Front

Which inner planet is covered with craters?

Back

Mercury.

Front

What is the main difference between rotation and revolution?

Back

Rotation is the spinning of a planet on its axis, while revolution is the orbiting of a planet around the Sun.

Front

What is the atmosphere of Venus primarily composed of?

Back

Carbon dioxide, with clouds of sulfuric acid.

Front

How long does it take for Mars to complete one revolution around the Sun?

Back

About 687 Earth days.

Front

What is the closest planet to the Sun?

Back

Mercury.

Front

Which planet is known as the 'Red Planet'?

Back

Mars.