A brown dwarf located 47 light-years away is behaving very strangely. The would-be star's brightness is constantly changing, fluctuating by as much as 30% in just eight hours. This could be an atmospheric disturbance that dwarfs Jupiter's Great Red Spot.
Brown dwarfs are objects that fall between the minimum mass of a dwarf star and the maximum mass of a gas giant — too big to be just a planet, but not big enough to ignite stellar fusion. That in-between status already puts them in a pretty sad position, and it only gets worse from there. One nearby brown dwarf is full of so many noxious gases that its atmosphere likely smells like "rotten eggs with a hint of ammonia", while another is actually colder than boiling water.