Our universe is full of mysteries, but few are as perplexing as the dark, tiny galaxies that hover around larger ones like the Milky Way.

'Dark subhaloes' may explain why galaxies seem to form pre-determined shapes

Source: space
Source Link: https://www.space.com/astronomy/galaxies/dark-subhaloes-may-explain-why-galaxies-seem-to-form-pre-determined-shapes