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5
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A binary star system in which one star periodically blocks the light from the other.
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8
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A mathematical method of writing numbers using powers of ten.
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9
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A galaxy shaped like a round or flattened ball, generally containing only old stars.
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10
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One of the small asteroid-like bodies that formed the building blocks of the planets.
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11
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The blue-white hot core of a star that is left behind after its outer layers have expanded and drifted out into space.
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12
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A mysterious force that appears to be causing the expansion of the universe to accelerate.
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13
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A large cloud of gas and dust in space, spread out in an immense volume.
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15
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A large, round, densely-packed grouping of older stars.
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16
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An enormously bright, distant galaxy with a giant black hole at its center.
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17
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The small, dense remains of a high-mass star after a supernova.
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20
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A galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern.
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22
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A galaxy that does not have a regular shape.
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23
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A star cluster that has a loose, disorganized appearance and contains no more than a few thousand stars.
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1
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An object whose gravity is so strong that nothing, not even light, can escape.
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2
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A contracting cloud of gas and dust with enough mass to form a star.
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3
|
A star system with two stars.
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4
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Matter that does not give off electromagnetic radiation but is quite abundant in the universe.
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6
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The electromagnetic radiation left over from the big bang.
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7
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A large cloud of gas and dust, such as the one that formed our solar system.
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14
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All of space and everything in it.
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18
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The observation that the farther away a galaxy is, the faster it is moving away.v
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19
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A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.
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21
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The initial explosion that resulted in the formation and expansion of the universe.
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24
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A rapidly spinning neutron star that produces radio waves.
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25
|
The brilliant explosion of a dying supergiant star.
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