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Universe and Electromagnetic Spectrum

Across
A unit of length in astronomy equal to the distance that light travels in one year in a vacuum.
The total amount of luminous energy emitted by a star. Related to star's brightness.
A graph that plots stars organized by luminosity and their temperature.
The distance between successive crests of a wave.
A galaxy with spiral shape that contains a central bulge thought to contain a black hole.
The family of waves starting from radio waves, microwaves, infrared rays, visible light, ultraviolet, and x-rays.
The distance light can travel in a unit of time through a given substance.
Very short wavelength and very high energy.
A celestial object that has a gravitational field so strong that not even light can escape it, created by a supernova.
A cloud of gas and dust in outlet space.
A sphere made up of extremely hot gases. Our Sun is a Medium size.
Down
All of time and space and its contents. Includes, planets, moons, stars, galaxies, and asteroids.
A type of electromagnetic wave of a frequency about 10*4 and 10*12 Hz
A series of star types n a band from the upper left (hot bright stars) to the lower right (cool dim stars).
The explosion of a star, possibly caused by a gravitational collapse, which increases the star's luminosity.
Light has shorter wave lengths than visible light.
A wave of light invisible to the human eye longer than an ultraviolet ray and shorter than a microwave .
A galaxy having an elliptical shape, three-dimensional with random orbits around its center.
Wave with a wavelength shorter than a radio wave but shorter than an infrared wave. Used in radars and communications.
The rate or number of crests of a wave that move past a given point in a given unit of time.
An electromagnetic wave of high energy an very short wavelength. Able to pass through many material.
A gravitational bound system of stars, separated from similar systems by vast region of empty space.