Unicorn Clouds

To the eye alone, the unicorn is a bust — there’s just not much to see. Look deeper, though, and the constellation Monoceros offers plenty to see. The list includes a couple of colorful stellar nurseries, which have given birth to thousands of stars.
The Rosette Nebula is named for its resemblance to a red rose. It’s a cloud of gas and dust that’s more than a hundred light-years across. Several young stars inside the nebula are especially hot and bright. They produce ultraviolet energy, which zaps hydrogen gas in the cloud, causing it to glow.
The visible nebula is part of a larger complex of gas and dust, known as the Rosette Molecular Cloud. It’s given birth to about 2500 stars, all within the last few million years.
Another big cloud in Monoceros is giving birth to new stars, too. It consists of several parts. There’s the Snowflake Cluster, which shines brightly. Nearby are the stars of the Christmas Tree Cluster, which — not surprisingly — form the outline of a Christmas tree. And