an object shaped like the top part of a ball
dome
a large group of stars and planets
galaxy
a place where people can live in space
space station
a group of people who live in a particular place
colony
a gas with the chemical symbol O
oxygen
the force that pulls two things towards each other
gravity
the top, outside part of something
surface
the air around the Earth or a planet
atmosphere
a long, thin space vehicle
rocket
a place from which activities can be carried out
base
any type of vehicle that can travel in space
spacecraft
the path an object takes when it moves around a larger object in space
orbit