The UK could cope if it was hit by a solar superstorm, experts have said.
A solar superstorm happens only once in every 100-200 years. It's when a huge outburst of radiation and particles from the Sun hits Earth.
The Royal Academy of Engineering panel found that such an event would be likely to cause some power cuts, affect satellites and force planes to be grounded.
But it said the UK was prepared and the disruption would not last for long.
The last solar superstorm happened in 1859.
It caused sparks to fly from pylons and night skies around the world were lit up by magnificent light displays.
Joe reported on big changes to our Sun last year as part of Newsround's Space Week.