You would be forgiven if you thought this picture was a soap bubble in front of an astronomical picture. This is a picture of a planetary nebula that was overlooked until this month. Astronomers say it is either spherical or column-shaped, in which case the camera is looking down the barrel of the column. Records indicate that the nebula, officially named PN G75.5+1.7 and nicknamed the "Cygnus Bubble", was recorded sixteen years ago during the second Palomar Sky Survey, but was overlooked at the time because it was so faint. Link -Thanks, healthylivinggal83!
(image credit: Travis A. Rector/U of Alaska Anchorage/Heidi Schweiker/NOAO)
And here I didn't realize there were so many hollow tubes holding up the Parthenon.