a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction

a celestial body that orbits around a planet

to find something for the first time

unable to find one's way or unable to be located

a vehicle designed for space travel

the totality of all space, time, matter, and energy

the layer of gases that surrounds a planet

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 person who is trained to travel in a spacecraft

the expanse that exists beyond the Earth and between celestial bodies

a label attached to an item, giving information about it

a voyage from one place to another that involves going into space

a trip that goes in one direction, without a return