Universe Crossword Puzzle

QUESTIONS LIST: hr diagram : a graph that plots stars organized by luminosity and by their temperature, star : a sphere made up of extremely hot gases, nebula : a cloud of gas and dust in outer space, main sequence : a series of stars types in a band from the upper left (hot bright stars) to the lower right (cool dim stars), luminosity : the total amount of luminous energy emitted by a star, gravity : it is the natural force of attraction that causes to fall toward the earth, irregular : a galaxy without a distinct shape. among the smallest galaxies. they contain a lot of gas and dust with continuous star formation, milky way : a spiral shaped galaxy that contains our solar system, spiral : a galaxy having an elliptical shape, three dimensional with random orbits around its center, elliptical : a galaxy having an elliptical shape, three dimensional with random orbits around its center, black hole : a celestial object that has a gravitational collapse, which increases the star's luminosity, supernova : the explosion of a star, possibly caused by a gravitational collapse, which increases the stars luminosity, galaxy : a gravitational bound system of stars, separated from similar systems by vast region of empty space, sun : the start that is the center of our solar system, universe : all of time & space and its contents includes planets, moons, stars, galaxies, asteroids