Sunday, May 26th, 2019

Scientists Discover Milky Way Made Up Entirely Of Dark Matter

Published on August 28, 2016 by   ·   No Comments

Scientists discover dark matter galaxy similar to our Milky Way

Yournewswire

An international team of astronomers has found a huge galaxy, similar to the Milky Way, that they say consists almost entirely of dark matter.

Using the world’s most powerful telescopes, Yale University astronomer Pieter van Dokkum says that scientists quickly realised that the galaxy, named Dragonfly 44, was unlike any other galaxy previously observed.

Phys.org reports:

The galaxy, Dragonfly 44, is located in the nearby Coma constellation and had been overlooked until last year because of its unusual composition: It is a diffuse “blob” about the size of the Milky Way, but with far fewer stars.

“Very soon after its discovery, we realized this galaxy had to be more than meets the eye. It has so few stars that it would quickly be ripped apart unless something was holding it together,” said Yale University astronomer Pieter van Dokkum, lead author of a paper in the Astrophysical Journal Letters.

Van Dokkum’s team was able to get a good look at Dragonfly 44 thanks to the W.M. Keck Observatory and the Gemini North telescope, both in Hawaii. Astronomers used observations from Keck, taken over six nights, to measure the velocities of stars in the galaxy. They used the 8-meter Gemini North telescope to reveal a halo of spherical clusters of stars around the galaxy’s core, similar to the halo that surrounds our Milky Way galaxy.

Star velocities are an indication of the galaxy’s mass, the researchers noted. The faster the stars move, the more mass its galaxy will have.

Read More HERE

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