Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Astronomers claimed that this galaxy was composed of 98% dark matter. They were wrong

Astronomers claimed that this galaxy was composed of 98% dark matter. They were wrong



As early as 2016, researchers claimed to have discovered a galaxy made almost entirely dark matter and almost no stars. Now, on closer inspection, this claim has disintegrated.

The galaxy, Dragonfly 44 (DF44), belongs to a class of mysterious objects known as ultradiffuse galaxies or UDGs. Researchers have been debating since the 1980s whether these huge, dark objects have a low mass, like dwarf galaxies smeared in vast expanses of space, or rather like heavy Milky Way galaxies which seem obscure for two reasons: because they have almost no stars, and because much of their mass is dark matter, located at the outer edges of the galaxy, in so-called halos of dark matter that do not emit light. In an article published in 201

6 in Astrophysical Journal Letters, scientists say DF44 is one of those galaxies with a large halo of dark matter and few stars. They calculated its mass and found that it was at least 98% dark matter.


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