The space observatory captured a bright burst of star formation triggered by two spiral galaxies crashing into one another.
The colliding galaxies, known collectively as Arp 220, generated an infrared glow that contains the light of more than 1 trillion suns. For comparison, the Milky Way galaxy has a luminosity that is the equivalent of about 10 billion suns.
These two galaxies began colliding about 700 million years ago, and as the gas and dust combined, a tremendous flare of star birth began. Previous observations of this star-packed region from other telescopes have observed different features. Radio telescopes saw 100 supernova remnants within an area of less than 500 light-years, while the Hubble Space Telescope documented the cores of the two original galaxies existing 1,200 light-years apart.
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