It's called 'K2-18b', dubbed a heavy, larger 'super-Earth', and it may have one ingredient necessary to support life as we know it: water.
(SOUNDBITE) (English) DR ANGELOS TSIARAS, ASTRONOMER, UCL SAYING:
"This is the first time that we have discovered an atmosphere around a planet that is not a gas giant, a Super Earth, and it is within a habitable zone of a star. This means that it is the right temperature to host liquid water."
That's astronomer Angelos Tsiaras, part of the team at the University College London that detected the water with the Hubble Space Telescope.
The so-called 'exoplanet' outside our solar system orbits a red dwarf star.
(SOUNDBITE) (English) DR ANGELOS TSIARAS, ASTRONOMER, UNIVERSITY COLLEGE LONDON SAYING:
"The main question that we're trying to answer here is whether Earth is unique in the galaxy or not. We are looking to find other planets that have similar conditions to Earth but of course this is not in order to find a place where we could go....The planet is located in a system more than a hundred light years away, meaning that whatever image we try to get is an image of the planet hundred years ago. The light takes only 7 to 8 minutes to come from the Sun to the Earth but 100 years to go to the planet."
Making travel there, impossible. Rather looking for earth alternatives, the team says it's best to focus on improving living conditions here on earth.