The ingredients that form planets and people were forged in stars. How that material was distributed throughout the universe is a key question that might be answered in part by studying the supernova remnant next-door, Cassiopeia A. (Also, it's pretty!) http://go.nasa.gov/3ZJnk72 #NASAExoplanets
A new mid-infrared image from NASA’s James Webb Space Telescope shows the supernova remnant Cassiopeia A (Cas A), created by a stellar explosion seen from Earth 340 years ago.
