Hubble's Top Ten Discoveries

Speeding Universe
How Old Is the Universe?
Early Universe
Alien Planets
Black Holes: Humungous and Among Us
Gamma Ray Bursts
Quasar Mysteries Revealed
Planet Construction Zones
Comet Fragments Bombard Jupiter
Cat's Eye Nebula
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Glowing in vibrant colors, planetary nebulae, such as this one, represent the death rattles of dying stars. These nebulae, which are not technically related to planets, are gas clouds forced outward by a dying star. According to NASA, "Hubble's keen 'eye' disclosed that planetary nebulas are like snowflakes: no two are like."

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—Image by NASA, ESA, HEIC, and the Hubble Heritage Team (STSci/AURA)
 

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