The Milky Way is blowing huge, mysterious bubbles that stretch for tens of thousands of light years.These ‘Fermi’ bubbles, which are mostly made up of gamma rays, were discovered four years ago by Harvard physicist Douglas Finkbeiner – and scientists have been trying to explain them ever since.Now a group of US researchers has used data from the Fermi Gamma-ray Telescope to create a ‘portrait’ two bubbles stretching out above and below our galaxy.

more Why is the Milky Way blowing bubbles? Portrait of strange structures revealed – but scientists still can’t explain their source | Mail Online.