What is deep space?
Why are people interested in space exploration?
How do stars differ from one another?
Which deep-space feature forms when a star collapses and then explodes?
A light-year is a measurement of
How does the big bang theory explain the origin of the universe?
Which statement about star life cycles is true?
A stars' brightness or luminosity can be explained by its...
Any planet that exists OUTSIDE the solar system is a(n)
Our solar system is in the ______ galaxy.
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