... The California Nebula . ... Drifting through the Orion Arm of the spiral Milky Way Galaxy, this cosmic cloud by chance echoes the outline of California on the west coast of the United States. ... A corona visible only to Earth observers in the right place at the right time. Rings like this will sometimes appear when the Sun or Moon is seen through thin clouds. ... This timely, telescopic, two panel mosaic spans about 10 full moons across planet Earth's predawn skies. ...