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The Hubble Space Telescope

Cat's Eye Nebula

Photo: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

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Cat's Eye Nebula

The Cat’s Eye is one of the most complex nebula known, filled with knots, jets and arc-like features. Located in the constellation Draco, it was originally discovered in 1786. The nebula provides astronomers with many mysteries, one being that chemical measurements taken by two different methods come up with completely different results, and scientists cannot figure out why.