Hidden behind a shroud of dust in the constellation Cygnus is an exceptionally bright source of radio emission called DR21. Visible light images reveal no trace of what is happening in this region because of heavy dust obscuration. In fact, visible light is attenuated in DR21 by a factor of more than 10,000,000,000,000,000,000,000,000,000, 000,000,000,000 (ten thousand trillion heptillion).
For this false-color composite of the DR21, the 8.28 µm band was rendered as blue, the 12.13 µm band was rendered as green, the 14.65 µm band was rendered as yellow, and the 21.3 µm band was rendered as magenta. This image covers 5 x 5 degrees in the sky.
Credit: MSX/IPAC/NASA