Day 21 of the 2024 Space Telescope Advent Calendar: inside a chaotic nebula. Sharpless 2-106 is a nebula several light-years across, seen here by Hubble in 2011. It lies 2,000 light-years away ...

What it is: An emission nebula, or star-forming region, named Sharpless 2-106 Where it is: 2,000 light-years away, in the constellation Cygnus When it was shared: December 2011 Why it's so special ...