Solar System

Front

What holds the planets in their orbits around the sun?

Back

Gravity is the force that holds the planets in their orbits around the sun.

Front

Why is space travel difficult for people?

Back

Space travel is difficult because the distances are very great; it is dangerous and expensive.

Front

The moon is a natural ______ of Earth.

Back

The moon is a natural satellite of Earth.

Front

What are the outer planets made of?

Back

The outer planets are very large and made of gases.

Front

What characteristics do Earth and Venus share?

Back

Earth and Venus are both similar in size and density.

Front

What is the largest planet in our solar system?

Back

Jupiter is the largest planet in our solar system.

Front

What is the main component of the sun?

Back

The sun is primarily made of hydrogen and helium.

Front

What is a comet?

Back

A comet is a small celestial body made of ice, dust, and rocky material that orbits the sun.

Front

What is the asteroid belt?

Back

The asteroid belt is a region between Mars and Jupiter where many asteroids orbit the sun.

Front

What is a satellite?

Back

A satellite is a celestial body that orbits a planet.