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A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, according to NASA. A galaxy is held together by gravity. They come in a variety of sizes, from small dwarf galaxies with only a few billion stars to giant elliptical galaxies with trillions of stars. Although most galaxies have elliptical shapes, a few have unusual shapes like toothpicks or rings.

NASA's Astronomy Picture of the Day is a breathtaking image of two dominant galaxies which have been locked in gravitational combat for years, located nearly 12 million light-years away in the northern constellation of the Great Bear. One of them is a spiral galaxy named M81 with spiral arms and a bright yellow core. It is known as Bode's Galaxy and spans nearly 100,000 light-years. The other is a cigar-shaped galaxy called M82.