How did people discover the existence of multiple galaxies?

Hubble published his work in 1929 and changed forever our view of the universe. Astronomers no longer thought our galaxy was the entire universe. Now they knew that the universe was composed of many, many galaxies. read more

This discovery implied that the other, even fainter, spirals were probably also galaxies even farther away. Hubble published his work in 1929 and changed forever our view of the universe. Astronomers no longer thought our galaxy was the entire universe. read more

Now they knew that the universe was composed of many, many galaxies. Seven decades later, a telescope named in Hubble’s honor helped discover that the observable universe was truly vast, and contained nearly 100 billion galaxies. read more

Edwin Hubble discovered galaxies, and his legacy continues today, 220 miles above the Earth, with his namesake, the Hubble Space Telescope. It, like the man throughout his lifetime, continues to make discoveries that change the face of astronomy. read more