The Day We Discovered the Universe

(Discover Blogs::Out There) – Corey S. Powell:

All across the sky, observers had documented intriguing spiral nebulae, swirls of light that resembled ghostly pinwheels in space. The most famous one, the Andromeda nebula, was so prominent that it was easily visible to the naked eye on a dark night. The significance of those ubiquitous objects was a mystery, however. …

outthere 2017/01/02 the-day

Moon and Andromeda galaxy

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