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Universe

Across
A celestial object that has a gravitational collapse, which increases the star's luminosity
A series of stars types in a band from the upper left (hot bright stars) to the lower right (cool dim stars)
All of time & space and its contents includes planets, moons, stars, galaxies, asteroids
The explosion of a star, possibly caused by a gravitational collapse, which increases the stars luminosity
A cloud of gas and dust in outer space
A galaxy without a distinct shape. among the smallest galaxies. They contain a lot of gas and dust with continuous star formation
A galaxy having an elliptical shape, three dimensional with random orbits around its center
A sphere made up of extremely hot gases
A spiral shaped galaxy that contains our solar system
Down
A galaxy also known as "disc" galaxies that have used up their interstellar matter with little star formation
A gravitational bound system of stars, separated from similar systems by vast region of empty space
A galaxy having an elliptical shape, three dimensional with random orbits around its center
It is the natural force of attraction that causes to fall toward the Earth
The total amount of luminous energy emitted by a star
A graph that plots stars organized by luminosity and by their temperature
The start that is the center of our solar system