Glossary

A person who travels beyond the earth's atmosphere.

The air surrounding the earth.

When you feel like something is incredible, an emotion that inspires you.

A body in space that consists mostly of ice and dust, and often develops one or more long tails when near the sun.

A lot of motion, noise or confusion.

A body (like a planet) in space that orbits the sun and has a spherical shape but is not big enough to push other objects from its orbit.

To stare at something for a long time, wishing you could be there.

Flowing like water.

Small bits of rock that leave a trail of light that you can see.

The space that is right above the earth.

The sun, earth, mercury, venus, mars, saturn, jupiter, neptune, uranus, and pluto.

A spacecraft that can bring people to space and back, over and over again.

To feel very excited.