An ___________ needs to train for many years before going into space.

The Earth's ___________ protects us from harmful rays from the sun.

The study of the universe and its origins is called the ___________.

A huge ___________ formed when a meteorite hit the moon's surface.

After the satellite exploded, there was a lot of ___________ floating in space.

The moon follows an ___________ around the Earth.

Space suits protect astronauts from harmful ___________ in space.

A ___________ sends information from space back to Earth.

In training, astronauts use a ___________ to practice what it will be like in space.

Our ___________ includes the sun and all the planets that orbit it.

The moon's ___________ pull causes the tides on Earth.

The plane leveled off and flew in a ___________ direction across the sky.

The meteor's ___________ streak across the sky was visible for just a few seconds.

Scientists hope to one day ___________ plants on Mars to support human life.