Astronomers have found a galaxy
that is made almost entirely of a mysterious, invisible substance
called dark matter. The dark matter galaxy is called Dragonfly 44. It’s roughly the same size as the Milky Way, so you could argue it’s kind of like our evil twin galaxy made of dark matter. Or, as the researchers put it, “Dragonfly 44 can be viewed as a failed Milky Way.” The discovery could help us finally answer 2
big questions about dark matter.
After sunset a partially cloudy sky can promote a beautiful show of colours, seen here over Cerro Paranal, in northern Chile. Stormy looking clouds are unlikely to release any rain in this exceptionally arid area, but they add a striking feature to the sky over two Auxiliary Telescopes (AT) of the ESO’s Very Large Telescope (VLT) array.
Under dark skies the setting of the Milky Way can be a dramatic sight. Stretching nearly parallel to the horizon, this rich, edge-on vista of our galaxy above the dusty Namibian desert stretches from bright, southern Centaurus (left) to Cepheus in the north (right). From early August, the digitally stitched, panoramic night skyscape captures the Milky Way’s congeries of stars and rivers of cosmic dust, along with colors of nebulae not readily seen with the eye. Mars, Saturn, and Antares, visible even in more luminous night skies, form the the bright celestial triangle just touching the trees below the galaxy’s central bulge. Of course, our own galaxy is not the only galaxy in the scene. Two other major members of our local group, the Andromeda Galaxy and the Triangulum Galaxy, lie near the right edge of the frame, beyond the arc of the setting Milky Way.
IMG_0439 by Darren Baskill Via Flickr: The Milky-way over Hale Pohaku, Mauna Kea, on the Big Island of Hawai'i. The red glow on the horizon is from one of the lava flows.
These are stills taken from this time lapse movie.