Scientists have created a new image of the tattered remains of a supernova explosion in our galaxy using Nasa's Hubble space telescope.
“It's all that's left of a star that went supernova 340 years ago, collapsing from the weight of its own gravity, then bursting in a sometimes galaxy-obscuring flash. This was followed by the expansion of its remnant materials—shown here in green (oxygen), red and purple (sulfur), and blue (hydrogen and nitrogen).
Centuries after the Cas A explosion, its gases are still on the move. Comparisons of Hubble images taken at different times reveal that some of the debris is traveling up to 31 million miles an hour (50 million kilometers an hour)—fast enough to go from Earth to the moon in 30 seconds.”