Did you know that stellar explosions & their remains — “supernova remnants” — are a source of chemical elements essential for life here on Earth? A new Chandra X-ray Observatory image captures the location of several vital elements like silicon (red), sulfur (yellow), calcium (green) and iron (purple), located on Cassiopeia A — a supernova remnant ~11,000 light years from Earth. Take a look: http://go.nasa.gov/2ja2jAK
