Chandra X-ray Observatory | Quick Look: NASA Telescopes Chase Down "Green Monster" in Star's Debris @ChandraXray | Uploaded January 2024 | Updated October 2024, 4 days ago.
Two NASA telescopes — Chandra and Webb — looked at a supernova remnant.

Cassiopeia A is the aftermath of a star that exploded about 340 years ago.

Recently, a mysterious structure dubbed the “Green Monster” was found there.

The combined data show it comes from the explosion’s blast wave hitting material.

For more information, visit: https://chandra.si.edu/photo/2024/casa