A Comet Movie

In August 2009, the Australian astronomer Gordon J. Garradd was working on a sky survey at the Siding Spring Observatory near Coonabarabran, New South Wales, when he discovered a comet. Comet discoveries aren’t unusual for Siding Spring; the observatory found … Continue reading»

Supernova!

Thirty-one million years ago, in a star-forming region of an outer arm in what we know as the Whirlpool Galaxy, a supergiant yellow star exploded. Around May 30, light from the explosion reached our neck of the Milky Way Galaxy. … Continue reading»