How do astronomers know how far away stars are? Unfortunately, it’s not a short and easy answer.
Hidden in the night sky, just above the hump of Taurus, is a giant crystal ball that shows both the past and the future. This is the Crystal Ball Nebula (NGC 1514). To look at this orb's gauzy, white ...
Planetary nebulae like the Crystal Ball Nebula (NGC 1514) are sort of like stellar obituaries. Though crystal balls supposedly reveal the future, the Crystal Ball Nebula tells us more about the past.
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