Mystery of Arp 82 Galaxies

Galaxy-pair (1)

This spectacular interacting pair of galaxies, together called Arp 82, is a scientific oddball. The color in the "tilted S" pair indicate that the observed stars are young to intermediate in age, around 2 million to 2 billion years old, much less the age of the universe (13.7 billion years). Astronomers hotly debate why Arp 82 didn't form many stars earlier, like most galaxies of its mass.

Via geology.com and Spitzer IRAC band 1 with SARA H-alpha …
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