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- Sep 1, 2010
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The Superwind Galaxy NGC 4666 is located ~ 80 million ly from Earth. Gravitational interactions between NGC 4666 and NGC 4668 (to the lower left) triggered intense star formation.
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Galaxy M74.
Bright pink (HII) regions decorating the spiral arms are huge and relatively short-lived, clouds of hydrogen gas which glow due to the strong radiation from hot, young stars embedded within them.