Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 March 13 LL Orionis: When Cosmic Winds Collide Credit: Hubble Heritage Team (AURA / STScI), C. R. O'Dell (Vanderbilt), NASA Explanation: This arcing, graceful structure is actually a bow shock about half a light-year across, created as the wind from young star LL Orionis collides with the Orion Nebula flow. Adrift in Orion's stellar nursery and still in its formative years, variable star LL Orionis produces a...
