Scientists have found strong evidence of a giant gas planet in the nearest star system to our own. At four-and-a-half light years away, the lifeless planet would be a close neighbour to Earth in astronomical terms and could have moons that sustain life.

Astronomers have found the strongest evidence yet of a giant planet in the "habitable zone" orbiting a star in the nearest solar system to our own Sun. The discovery was made using NASA's James Webb Space Telescope,