Artwork: The planet's mass would suggest it is a rocky world like EarthThe nearest habitable world beyond our Solar System might be right on our doorstep - astronomically speaking.
Scientists say their investigations of the closest star, Proxima Centauri, show it to have an Earth-sized planet orbiting about it.
What is more, this rocky globe is moving in a zone that would make liquid water on its surface a possibility.
Proxima is 40 trillion km away and would take a spacecraft using current technology thousands of years to reach.
