The Cassiopeia A supernova remnant, seen in X-ray, visible, and infrared light on January 8, 2024, is a striking image combining data from NASA’s Chandra X-ray Observatory, Hubble, Webb, and Spitzer space telescopes. A study by the XRISM spacecraft marks the first X-ray detections of chlorine and potassium in the wreckage, with a paper published in Nature Astronomy on December 4, 2025. This discovery sheds new light on the elemental composition of supernova remnants, providing valuable insights into the complex processes that occur during these cosmic events.
To learn more about this groundbreaking discovery, you can read further details on NASA’s website [here](https://science.nasa.gov/missions/xrism/nasa-jaxa-xrism-finds-elemental-bounty-in-supernova-remnant/).
(Image credit: X-ray: NASA/CXC/SAO; Optical: NASA/ESA/STScI; IR: NASA/ESA/CSA/STScI/Milisavljevic et al., NASA/JPL/CalTech; Image Processing: NASA/CXC/SAO/J. Schmidt and K. Arcand)
Original Source: NASA