Astronomers still don't know what dark matter is, even though it makes up 85% of the matter in the universe. In a new paper, astronomers suggest that huge clouds of positively charged hydrogen at the center of the Milky Way could be a hint toward the nature of dark matter. The traditional theory is that cosmic rays cause this charged hydrogen, but the annihilation of dark matter concentrated together could also be knocking out negatively charged electrons.

Mysterious phenomenon at centre of galaxy could reveal new kind of dark matter

A mysterious phenomenon at the centre of our galaxy could be the result of a different type of dark matter.

King's College London (www.kcl.ac.uk)