A couple of months ago I posted just the H-alpha channel of this image from the remote observatory in Australia.  The addition of O-III and S-II data makes a dramatic difference – well worth the wait! This is actually just a small portion of the Vela SNR, one of the largest and brightest SNRs in our night sky, just 1.5 degrees wide out of the full width of 8 degrees.  The supernova that produced this magnificent nebula happened about 11,000 to 12,000 years ago and was just 800 light-years from Earth in the constellation Vela. The total exposure time for […]