Ever-photogenic Comet Lovejoy at its closest to the Seven Sisters, or Pleiades, star cluster. The comet's long blue ion tail stretched back past the cluster.
Stunning image! The robotic Cassini spacecraft has been orbiting Saturn since 2004. It has produced some of the most magnificent images in our solar system.
Talk about being in the right place at the right time! Noel Keating tried all last year to capture video of a plane crossing the sun. On January 3, 2015, he did it!
This is a Type Ia supernova. A white dwarf pulls matter from its companion star until it begins to collapse. Suddenly .. bam! It explodes as a supernova.