All terms in this list:

Big Bang: a theory of an explosion that explains how our universe began

Stars: gravity pulls in gases hydrogen and helium, moves so fast they make nuclear reactions; LIGHT

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

Milky Way: The galaxy in which Earth is located one of 10 billion in the Universe

Galaxies: group of over 200 billion stars, there are 10 billion galaxies, ours is spiral

Earth: The third planet in order from the Sun, upon which humans live. Represented in astronomy and astrology by ♁ and ⊕.

molecule: The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; a group of atoms held together by chemical bonds.