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Objects in Space

Across
A system of millions or billions of stars surrounded by gas and dust all held together by gravitational attraction
A very large star that is even brighter than a giant, despite being relatively cool
A giant, rare star that is extremely bright. They burn their fuel rather quickly and die out in a supernova
A material that exists in space that has not yet been discovered
A continuous area or expanse that is free, available, or unoccupied
A region of space having a gravitational field so intense that no matter or radiation can escape
A celestial object consisting of a nucleus of ice and dust and, when near the sun, a "tail" of gas and dust particles pointing away from the sun forms
A cluster of galaxies which occur as clusters
A star showing a sudden increase in brightness and then slowly returning to its original state over a few months
A small rocky body that orbits around a sun
A type of star that is the same as our Earth's sun
Down
A celestial body moving in an elliptical orbit around a star
An artificial body placed in an orbit around the earth or moon or another planet in order to collect information or for communication
A physical substance that has mass and takes up space
A group of galaxies and stars clustered together
A star in the last stage of evolution, and the type of star our sun will eventually turn into
All matter and space as a whole; contains all of the galaxies
A celestial body resembling a small planet
A small, very dense star that is typically the size of a planet. It is formed when the star has exhausted all of its central nuclear fuel
An object that orbits around a planet