Hubble Space Telescope image of Hanny's Voorwerp, a giant green cloud of ionized oxygen, near the spiral galaxy IC 2497. The Voorwerp, discovered by citizen scientist Hanny van Arkel, is believed to be a tidal tail illuminated by a now-dormant quasar in IC 2497. A star-forming region is visible in yellow near the galaxy. Both objects are located approximately 650 million light-years away in the constellation Leo Minor.

Astronomy Picture from 10/02/2011

Hanny's Voorwerp

Source: https://apod.nasa.gov/apod/ap110210.html


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