Scientists had said the Northern Lights, officially called Aurora Borealis, would be visible across much of Britain last night.
They can usually only be seen in the world's northernmost countries, but a mass ejection of particles from the sun three days ago has seen the lights move a lot further south than usual.
Last night's display was not as strong as expected, although scientists say they did come as far south as the M4 corridor, and the wispy green lights were pictured in the skies above north Wales.
But tonight there is expected to be a better chance they will be visible across many parts of the UK, with an 85% chance of activity.
It is even possible that they could be seen in some built-up areas, including London, although Scotland still has the best chance of catching a glimpse.
Joe Kunches from The Space Weather Prediction Center (SWPC) in Colorado told Sky News: "The geomagnetic storm that drives the aurora structure south is beginning right now.
"We're not sure how strong the storm will be but if it follows predictions there’s a good chance of seeing it in southern Britain."
Experts say the best time to see them is between midnight and 3am, and you are more likely to see them away from urban areas and in a spot with good views of the horizon in the north.
The Northern Lights occur when solar particles cross into the Earth’s atmosphere and let out burning gases that produce different coloured lights.
These are made up of chemicals including oxygen, which produces green and yellow and nitrogen, which produces blue.
