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Stars, Galaxies and the Universe

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