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Astronomers for the first time discovered water in the atmosphere of a planet orbiting an orbit that could be inhabited.
Finding water makes the New World, dubbed K2-18B, a candidate for research on extraterrestrial life.
Within 10 years, new telescopes may be able to determine whether K2-18B's atmosphere contains gases that can be produced by organisms.
The details were published in the journal Nature Astronomy, according to the BBC Arabic.
Professor Giovanna Tenetti, a professor at University College London, described the discovery as "astounding."
"It is the first time we have discovered water on a planet in the region where we can live around a temperature star in line with life," Tennessee said.
The area that can be inhabited is the area around a star where the temperature allows water to be in a liquid state on the surface of a planet.
K2 -18B is 111 light-years from Earth, or about 650 million miles, a distance that exceeds the capacity of any probe.
The size of the new planet is about twice the size of Earth and its temperature allows water to be in a liquid state, between 0 and 40 degrees Celsius.
Angelius Tsarias, a member of the team at the University College London, said finding water on a planet fit for life was "amazingly exciting."
"It brings us closer to answering the key question: Is Earth a unique planet?"