April 2, 2013
Light takes eight minutes to travel from the Sun to the Earth. It took the universe 13.8 billion years to make you.
IC 4592: The Blue Horsehead Reflection Nebula
Birthday · April 2, 2013
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APOD published April 2, 2013. Credit: Scott Rosen. A publication-date match, not a photo taken on your date. Independent of NASA.
Do you see the horse's head? What you are seeing is not the famous Horsehead nebula toward Orion but rather a fainter nebula that only takes on a familiar form with deeper imaging. The main part of the above imaged molecular cloud complex is a reflection nebula cataloged as IC 4592. Reflection nebulas are actually made up of very fine dust that normally appears dark but can look quite blue when reflecting the light of energetic nearby stars. In this case, the source of much of the reflected light is a star at the eye of the horse. That star is part of Nu Scorpii, one of the brighter star systems toward the constellation of the Scorpion Scorpius. A second reflection nebula dubbed IC 4601 is visible surrounding two stars on the upper right of the image center.
Image credit: Scott Rosen