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Big Bang: a theory that explains how an explosion 15 billion years that started the universe.

star formation: hydrogen and helium were formed & move outward in all directions it began to cool and form stars.

nebula: A cloud in outer space consisting of gas or dust (e.g. a cloud formed after a star explodes).

Milky way galaxy: 4.5 billion yrs ago the edge of the galaxy, or cluster of stars, that we call the Milky Way

galaxies: there are 200 bill stars in the Milky way 10 billion galaxies in the whole universe. 2,000,000,000,000,000,000,000,000 stars in the entire universe

Astronomy: The study of stars,planets & other objects in space.

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