a person who is trained to travel into outer space

A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity

A force of attraction between objects that is due to their masses.

the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets

A natural or artificial body that revolves around a planet

Any large mass of ice that moves slowly over land

land surrounded by water on three sides

a person or animal that lives in a certain place

a broadleaf evergreen forest found in wet and hot regions near the equator

Overall weather in an area over a long period of time