The Horsehead Nebula is one of the most famous nebulae on the sky. It is visible as the dark indentation to the orange emission nebula at the far right of the featured picture. The horse-head feature is dark because it...
It is a galaxy held in place by the gravitational pull of many celestial objects and bodies, including stars, planets, moons, comets, and asteroids. The universe is made up of billions of galaxies. Earth is a small planet in a...
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