A galaxy made of 99.9% dark matter 8/30/16 EarthSky | Although it’s relatively nearby, Dragonfly 44 was missed for decades by astronomers because it’s very dim. But there’s more to this galaxy than meets the eye. Dragonfly 44 from the Sloan Digital Sky Survey.
NGC 7714 ~ This unusual structure is a river of Sun-like stars that has been pulled deep into space by the gravitational tug of a by a passing galaxy, not seen in this Hubble Space Telescope photo. That's because the near-collision between the galaxies happened at least 100 million years ago.
Cassiopeia -- New Photo Reveals ‘Ghostly’ Green Nebula in Deep Space An amazing new photo from a telescope in Chile has captured the most detailed view yet of a green glowing blob 3,300 light-years away from Earth. Credit: ESO The new image, released today (April 10) by the European Southern Observatory