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Stars, Galaxies and the Universe

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Across
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_________ brightness is the brightness a star would have if it were at a standard distance from Earth.
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The core left behind when a low or medium mass star dies
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A building that contains one or more telescopes.
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A star is born when nuclear ______ starts.
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Radiation with the highest energy of the electromagnetic spectrum.
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________ radiation is energy that can travel through space in the form of waves.
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The distance that light travels in one year.
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A device that makes distant objects appear to be closer.
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Stars that are the remains of high mass stars.
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Radiation with a wavelength just longer that red light.
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A reflecting telescope in space orbiting above Earth's atmosphere.
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A lens that is thicker in the middle that at the edges.
Down
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That galaxy that our solar system is located.
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A rapidly spinning neutron star that produce radio waves.
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A telescope that uses convex lenses to gather and focus light.
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A imaginary pattern of stars.
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Optical telescope that uses mirrors
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A contracting cloud of gas and dust with enough mass to form a star.
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_________ brightness a star's brightness as seen from Earth.
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The brilliant explosion of a dying supergiant star.
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A galaxy that has a pinwheel pattern. The Milky Way and example.
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The initial explosion that resulted in the formation and expansion of the universe.
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A large cloud of gas and dust spread out in an immense volume
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The light you can see.
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Waves that have a long wavelength and low energy.