Stars, Galaxies and the Universe Crossword

The colors in the spectrum of a side moving toward earth are shifted slightly toward blue.
A star that suddenly becomes brighter.
An observed change in the frequency of a wave when the source or observer is moving.
A large celestial body that is composed of gas and that emits light.
14 billion years ago, a sudden event that sent all matter and energy outward in all directions.
The coldest temperature possible.
Nightly luminous stars from main sequence stars that are more massive than the sun, which becomes larger than giants in their third stage.
A large cloud of gas or dust in interstellar space; a region in space where stars are born.
an object so massive and dense that even light cannot escape its gravity.
Pair of stars that revolve around each other and are held together by gravity.
A collection of stars, dust, and gas bound together by gravity.
Unknown material
The total amount of energy stars give off each second.
The brightness of a star as seen from earth.
The study of the origin, properties, and evolution of the universe.
A spiral galaxy in which the sun is one of hundreds of billions of stars.