This one we can see (Image: NASA/JPL-Caltech/STScI)
WHERE are all the missing galaxies that should be orbiting the Milky Way? Cosmic rays may have “sterilised” them so that they cannot form new stars and so are now too dim to see.
Standard theories of dark matter and galactic evolution predict that a few thousand dwarf galaxies should be spiralling around our galaxy, but a mere 35 have been found. Many are very faint, though, suggesting others might not be missing but instead are unseen blobs of dark matter.
Now, Markus Wadepuhl and Volker Springel of the Max Planck Institute…
