Only a fraction of the size of the Milky Way, these galaxies have thus far been too faint for most telescopes to spot.

Discovery of 250 'mini galaxies' could help scientists pin down the nature of dark matter

Source: space
Source Link: https://www.space.com/astronomy/galaxies/discovery-of-250-mini-galaxies-could-help-scientists-pin-down-the-nature-of-dark-matter