Space is very big.  All the planets, Earth, the Sun, and moons are in space!  Stars are in space.  Space is very, very bog.  There is no air in space.

Planets are very big.  Planets are in space.  Planets can be made of rock or gases.  Earth is a planet.  There are 8 planets in our Solar System.

The Sun is a star.  The sun is very, very, big.  The Sun is in space.  The Sun is very, very hot.  The Sun is made of burning gas!

Stars are very, very big.  Stars are in space.  Stars look small because they are so far away.  Stars are very hot.  Stars are made of burning gas.  Our sun is a star.

A moon is made of rock.  A moon os very big.  A moon is smaller than a planet.  A moon goes around a planet.

Asteroids are in space.  An asteroid is a very big rock.  Asteroids move in space.

A meteoroid is a rock that can move in space.  A meteoroid is smaller than an asteroid.

A rocket goes into space.  A rocket can carry atronauts into space.  We have sent rockets to the moon, and to Mars.

An astronaut is a person whose job is to go into space.  An astronaut can go into space in a rocket.  Astronauts have gone to the moon, and to man made satellites in space, like the International Space Station.