2 thoughts on “APOD is !! Today”

  1. Barnard's Loop in OrionNote how well Barnard’s Loop shows up in this photo.  I have cropped out Orion and crudely outlined the loop in yellow.

    Barnard’s Loop is very difficult to see with the unaided eye but pops right out in a time exposure photograph.  It is an emission nebula located somewhere between 500 and 1500 light years from Earth which is believed to be a remnant of a supernova explosion around two million years ago.  The young, bright stars of the Orion Nebula are believed responsible for ionising the gas in the remnant and making it visible.  Barnard’s Loop subtends around 600 arc minutes, or around the diameter of 20 full Moons.

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  2. John Walker:
    Barnard’s Loop subtends around 600 arc minutes, or around the diameter of 20 full Moons.

    Thanks.  I really like being reminded of relations, or values, like that.  I don’t think about those things very often, so it is valuable to be given these practical examples.

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