X-Rays From IC 443 . ... The supernova remnant IC 443 is typical of the aftermath. ... Known to be interacting with galactic molecular clouds , the expanding supernova remnant was also recently discovered to have regions of intense higher energy X-ray emission (coded blue in this map) near the molecular cloud boundaries. This X-ray emission may indicate that electrons are being accelerated within the remnant, gaining in energy as they surf back and forth across the expanding shock wave. ...