The dwarf galaxy UGC 5340 is forming stars irregularly, likely due to a gravitational interaction with a companion galaxy that is not pictured here. Gravitational interactions often trigger new star formation, leading to the collapse of interior gas clouds. Dwarf galaxies should have widely varying dark matter ratios, with a hypothetical but transient dark matter-free population emerging as a necessary prediction. (NASA, ESA, AND THE LEGUS TEAM)

This Is Why Every Galaxy Doesn’t Have The Same Amount Of Dark Matter

Some galaxies might not have any dark matter. Here’s why you should care.

There are two assumptions that everyone makes about the Universe for extremely good reasons, but they might not necessarily be true. The first is that the laws of physics that govern the Universe are the same everywhere and at…