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Resembling a diamond-encrusted bracelet, a ring of brilliant blue star clusters wraps around the yellowish nucleus of AM 0644-741 in this image from the Hubble Space Telescope (HST). The sparkling blue ring is 150,000 light-years in diameter, making it larger than our entire home galaxy, the Milky Way. AM 0644-741, also known as the Lindsay-Shapley Ring, is an unbarred lenticular galaxy, and a "ring galaxy", which is 300 million light-years away in the direction of the southern constellation Dorado.
The ring is theorized to have formed by a collision with another galaxy, which triggered a gravitational disruption that caused dust in the galaxy to condense and form stars, which forced it to then expand away from the galaxy and create a ring. The ring is a region of rampant star formation dominated by young, massive, hot blue stars. The pink regions along the ring are rarefied clouds of glowing hydrogen gas that is fluorescing as it is bombarded with strong ultraviolet light from the blue stars. Galactic simulation models suggest that the ring of AM 0644-741 will continue to expand for about another 300 million years, after which it will begin to disintegrate.
Image Credit: NASA, ESA, and The Hubble Heritage Team (AURA/STScI)
Image enhancement: Jean-Baptiste Faure
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