description DR 21 Overview
DR 21 is a heavily obscured, massive star-forming region in the constellation Cygnus. It contains dense molecular material and is associated with a highly energetic molecular outflow produced during the formation of massive stars. Dust blocks much of its visible light, so astronomers study the region mainly through infrared and radio observations of its gas, dust, and embedded young stars.
help DR 21 FAQ
What is DR 21?
DR 21 is a heavily obscured massive star-forming region in the constellation Cygnus. Dense molecular clouds hide much of it from visible-light observers.
Why is DR 21 difficult to see in visible light?
Dust blocks much of the visible light from the region. Astronomers therefore study DR 21 with infrared, radio, and other wavelengths that can pass through or reveal the surrounding material.
What is forming inside DR 21?
Massive stars are forming inside dense molecular material. The region is also associated with a highly energetic molecular outflow produced during massive-star formation.
Is DR 21 a planetary nebula?
No. DR 21 is an active star-forming region, whereas a planetary nebula is gas expelled by a dying lower- or intermediate-mass star. The two types of nebula represent very different stages of stellar evolution.
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