It went dormant for a time until it was started again as NEOWISE in 2013, to search for near-Earth objects (NEOs) including comets ... the California Nebula spans 100 light-years.

We are staring "right down the barrel of it, which is really quite surprising to me — we're just lucky." One of the most photographed objects in the night sky is the Ring Nebula, wreckage of a ...