VOCAB
Theory that says the universe began as a small point that expanded rapidly about 13.7 billion years ago.
Tiny particles of matter floating in space; condenses under gravity to form stars and planets.
This is a form of matter with indefinite shape and volume.
The force that causes objects with mass to attract one another.
The Sun together with the group of planets and other celestial bodies that are held by its gravitational attraction and revolve around it
A large grouping of stars in space.
