The galaxy's stars keep a record of its history. By reading those stories, astronomers are learning more about how the Milky Way came to be—and about the galaxy we live in today.
Late in the evening of October 5, 1923, Edwin Hubble sat at the eyepiece of the Hooker telescope at the Mount Wilson Observatory atop the mountains overlooking the Los Angeles basin. He was observing an object in the northern sky. To the unaided eye, it was visible as a faint smudge. But through a telescope it sharpened into a brilliant ellipse called the Andromeda Nebula.
A Disturbance in the Galaxy Eons before Hubble sat at the eyepiece, ages before the sun was born, long before the Milky Way existed, the Big Bang wrenched apart all matter and indiscriminately scattered it throughout the newborn cosmos. The first galaxies eventually formed from bits of random detritus, starting a 13-billion-year sequence that led to us.
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