Popular culture has defined several kinds of Blue Moons, but the one coming up March 31 is relatively rare. It's the 2nd Blue Moon this year. That hasn't happened since 1999 and won't again until 2037.
The ghostly galaxy NGC 1052-DF2 is exceedingly diffuse. See the distant galaxies behind it? The galaxy is missing most, if not all, of its dark matter. The Hubble Space Telescope's Advanced Camera for Surveys acquired this image, which is via NASA, ESA, and P. van Dokkum at Yale.
The moon is now waxing Saturday's full Blue Moon. In the meantime, look for the moon from late afternoon until after midnight. Jenney Disimon caught today's moon - 94.2% illuminated - from Seoul, S. Korea.
