 Here we are zooming into a supernova remnant in the small Magellanic Cloud, a satellite galaxy of our Milky Way located 200,000 light-years away. The gaseous knots in this supernova remnant moving toward Earth are colored blue and the ones moving away are shown in red. This new Hubble image shows these ribbons of gas speeding away from the explosion site at an average speed of 3.2 million kilometers per hour or 2 million miles per hour. According to the latest estimates, light from this blast arrived at Earth 1,700 years ago during the decline of the Roman Empire. To pinpoint when the explosion occurred, researchers studied the oxygen-rich clumps of ejecta flung out by this supernova blast. They traced the knot's motion backward until the ejecta coalesced at one point, identifying the explosion site. Once that was known, they could calculate how long it took the speeding knots to travel from the explosion center to their current location.