This is Messier 46 and NGC 2438:

Messier 46 is the open cluster of colorful stars and NGC 2438 is the small, colorful nebula above the center of the image.

This picturesque image contains thousands of stars, is located in the constellation of Puppis, and is about 37 light years wide. The total integration time of this image is 80 minutes across all filters (LRGB).

You can download the FITS files for this image (30Mb) from the Sample Downloads page and try your hand at processing this image.

Click this link for the full-size version (35Mb, 2750×2750 pixels): Full-size Image: M46 and NGC 2438