Cooler temperatures lead to dimmer auroras, according to NASA. This could explain why Neptune’s auroras were concealed for so long. Leigh Fletcher of Leicester University, co-author on the Nature ...

Experts are not sure why Neptune's auroras can be seen around the planet's "mid-latitudes," and not the north and south poles NASA, ESA, CSA, STScI, Heidi Hammel (AURA), Henrik Melin (Northumbria ...