NASA’s deepest 3D fly-through of the Universe

It’s hard to believe, but it was only 100 years ago — back in 1923 — that humanity first realized that the Milky Way galaxy didn’t encompass the entire Universe. That key discovery was made by Edwin Hubble, who, while observing what was then known as the Great Nebula in Andromeda, recognized that a periodic light “flare” he was seeing wasn’t a nova as he originally thought, but was rather a variable star located much, much farther away than any of the Milky Way’s stars. It was the first slam-dunk evidence that these spiral (and elliptical) nebulae, observed for centuries, were actually galaxies all unto themselves, or as they were called at the time, “island universes.” <a href="https://medium.com/starts-with-a-bang/nasas-deepest-3d-fly-through-of-the-universe-2211a8e3e7aa">Read More</a>