D ay 13 of the 2024 Space Telescope Advent Calendar: a cloud in the deep sky. This image, featuring the central region of the Chameleon I dark molecular cloud, about 630 light-yea ...

For example, the thick middle of the blob is very dark, but the loops around the outside are thin enough to allow some of the background light ... happens to be why the sky is blue).

let's explore more of the sky! As for some background, there are over 10 different clouds, all weighing more than a million pounds! Above are iridescent clouds, which are known as rainbow clouds.