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Stars and Galaxies Crossword Puzzle

Across
Theory on how the universe began (2 words)
Electromagnetic radiation with wavelengths shorter than visible light but longer than X-rays
Electromagnetic radiation with wavelengths shorter than radio waves but longer than visible light
A shortcut between different universes or times caused by a warp in space-time
A neutron star that sends out beams of radiation as it spins
The brightest objects in the universe
Invisible matter that can be detected only by the effect of its gravity (2 words)
An ordinary star that shines by converting hydrogen to helium through nuclear fusion (3 words)
The color produced by the hottest stars
Distance light travels in a vacuum in one year
Gas cloud created when a star blows off its outer layers after it has run out of fuel to burn (2 words)
Star systems with three stars (2 words)
A small brilliant star that is the remains of a red giant's core (2 words)
Shortest wavelengths in the electromagnetic spectrum (2 words)
An active galaxy with a supermassive black hole at its center
Down
The smallest stars (2 words)
Process by which energy is produced in a star (2 words)
The largest stars in the universe (2 words)
Electromagnetic radiation with wavelengths shorter than unltraviolet radiation but longer than gamma rays
The remains of a star that has died and collapsed into itself (2 words)
A large star that is nearing its end with a low surface temperature and a reddish color (2 words)
A ball-shaped cluster of stars that orbits a large galaxy (2 words)
A cloud of gas and dust in space
Longest wavelengths in the electromagnetic spectrum (2 words)
The remains of a supernova core that has collapsed to the size of a city (2 words)
A planet located outside our solar system
Nearest spiral galaxy to Earth
An exploding star
Force that attracts bodies with mass and energy toward each other
Nearest red star supergiant to Earth