May 2, 2025 · Galaxies consist of stars, planets, and vast clouds of gas and dust, all bound together by gravity. The largest contain trillions of stars and can be more than a million light-years across.

A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. [1][2] The word is derived from the Greek galaxias (γαλαξίας), literally 'milky', a reference to …

Nov 27, 2025 · Galaxy, any of the systems of stars and interstellar matter that make up the universe. Many such assemblages are so enormous that they contain hundreds of billions of stars.

Jul 25, 2023 · How many galaxies are there in the Universe? Recent estimates tell us that there could be as many as two trillion galaxies in the observable Universe. Two trillion galaxies is an estimate. …

Mar 23, 2025 · Typically, galaxies are millions of light-years apart. Galaxies are the building blocks of our universe. Their distribution isn’t random, as one might suppose. Instead, galaxies reside along...

Galaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity. Nearly all large galaxies are thought to also...

Dive into the dazzling depths of the universe with this galaxy-themed trivia quiz that spans cosmic facts, mysterious phenomena, and the wild wonders of deep space.

Jan 18, 2024 · What is a galaxy, and what are the different types found in the Universe? Find out about galaxy formation and the history of their study.

Mar 19, 2025 · The Hubble Space Telescope has provided deep-field images of galaxies billions of light-years away. These ancient galaxies tell the story of how the universe evolved from a hot, dense, …

Naked-eye galaxies This is a list of galaxies that are visible to the naked eye, for at the very least, keen-eyed observers in a very dark-sky environment that is high in altitude, during clear and stable weather.