NASA is looking into just why previously unknown structures, the ‘Green Monster,’ inside Cassiopeia A, are now missing in this image. Molecules and dust churn around and then transform into ...

Astronomers have delved into the intricate details of the Cassiopeia A (Cas A) supernova remnant like never before by merging data from NASA’s Chandra X-ray Observatory and James Webb Space ...

Caption A photograph of Cas A from NASA's Chandra X-ray Observatory reveals the supernova remnant's complex structure. In this representative-color image low-energy X-rays are red, medium-energy ...

In 2007 NASA's Spitzer space telescope found the infrared signature of silica (sand) in the supernova remnant Cassiopeia A. The light from this exploding star first reached Earth in the 1600s.

Elementary Nature of Cassiopeia A: This image from NASA’s Chandra X-ray Observatory shows the location of different elements in the Cassiopeia A supernova remnant including silicon (red), sulfur ...

NASA's James Webb Telescope’s NIRCam reveals the Tarantula Nebula in stunning detail, uncovering tens of thousands of young ...

SMACS 0723 Deep Field: The deepest and sharpest infrared image of the distant universe to date, captured by NASA's James Webb Space Telescope, revealing thousands of galaxies in a single frame.

In this composite photo of supernova remnant Cassiopeia A, created by meshing x-ray images from the Chandra Observatory, visible images from the Hubble Telescope and infrared images from the James ...