A telescope that uses convex lenses to gather and focus light

An imaginary pattern of stars in the sky

The brightness of a star if it were at a standard distance from Earth

A graph relating the surface temperatures and absolute brightness of stars.

A large cloud of gas and dust in space, spread out in an immense volume

The initial explosion that resulted in the formation and expansion of the universe

A galaxy with a bulge in the middle and arms that spiral outward in a pinwheel patter

A galaxy shaped like a round or flattened ball, generally ball, generally containing only old stars

A large, round, densely-packed grouping of older stars

One of the small asteroid-like bodies that formed the building blocks of the planets

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