Astronaut captures best ever images of the strange sights from the ISS
For years, their existence has been debated - elusive electrical discharges in the upper atmosphere that sport names such as red sprites, blue jets, pixies and elves.
But an astronaut has confirmed the displays do exist, capturing stunning footage of them from the International Space Station.
New findings have been published which suggest that the electrical discharges may unsettle the chemistry of the stratosphere, with possible implications for the Earth's radiation balance.
Blue discharges and jets are examples of a little-understood part of our atmosphere. But Andreas Mogensen has managed to captured the incredible phenomenon on camera