Solar System

Front

What is the force that keeps planets from drifting off into space?

Back

Gravity

Front

Which group of planets are smaller: Inner planets or Outer planets?

Back

Inner planets

Front

What is a small, icy object that develops a glowing tail as it nears the Sun?

Back

Comet

Front

Why do scientists think some of Earth’s water may have come from comets?

Back

Comets and Earth have the same ratio of 'heavy water.'

Front

Which planet is hotter: Venus or Mercury?

Back

Venus is hotter.

Front

What are the four inner planets of the Solar System?

Back

Mercury, Venus, Earth, Mars.

Front

What are the outer planets also known as?

Back

Gas giants.

Front

What is the largest planet in our Solar System?

Back

Jupiter.

Front

What is the main component of a comet's tail?

Back

Gas and dust released as it approaches the Sun.

Front

What is the term for a rocky object that orbits the Sun, primarily found in the asteroid belt?

Back

Asteroid.