Our Solar System and Galaxy

Front

What is a galaxy?

Back

A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

Front

How long does it take for the Earth to rotate once on its axis?

Back

24 hours.

Front

What is the solar system?

Back

The sun, planets, and all the other objects that revolve around the sun.

Front

What is rotation?

Back

The turning of an object on its axis.

Front

What is an asteroid?

Back

A small rocky or metallic object that orbits the sun.

Front

What is the universe?

Back

All of space and everything in it, including galaxies, stars, planets, and all forms of matter and energy.

Front

What is a planet?

Back

A large celestial body that orbits a star, such as the sun.

Front

What is a comet?

Back

A small icy body that, when passing close to the sun, heats up and begins to release gases, forming a glowing coma and sometimes a tail.

Front

What is the difference between rotation and revolution?

Back

Rotation is the turning of an object on its axis, while revolution is the movement of an object around another object.

Front

What is the Milky Way?

Back

The galaxy that contains our solar system.