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Found! 3 Super-Earth Planets That Could Support Alien Life

Gliese 667C
This artist’s impression shows the view from the exoplanet Gliese 667Cd looking towards the planet’s parent star (Gliese 667C). Image released on June 25, 2013. (Image credit: ESO/M. Kornmesser)

The habitable zone of a nearby star is filled to the brim with planets that could support alien life, scientists announced today (June 25).


The three potentially rocky planets in Gliese 667C's habitable zone are known as super-Earths — exoplanets that are less massive than Neptune but more massive than Earth. Their orbits make them possible candidates for hosting life, officials from the European Southern Observatory said in a statement. [See images of the alien planets of star Gliese 667C]

This diagram shows the system of planets around star Gliese 667C. A record-breaking three planets in this system are super-Earths inside the star's habitable zone, where liquid water could exist, making them possible candidates for alien life. This is the first system found with a fully packed habitable zone. Separation of planets not to scale. Image released June 25, 2013. (Image credit: ESO)

"We knew that the star had three planets from previous studies, so we wanted to see whether there were any more," co-leader of the study Mikko Tuomi of the University of Hertfordshire, U.K. said in a statement. "By adding some new observations and revisiting existing data we were able to confirm these three and confidently reveal several more. Finding three low-mass planets in the star's habitable zone is very exciting!"

This is the first time three low-mass planets have been spotted in the habitable zone of the same star system, and it's unlikely that astronomers will find any more around Gliese 667C. The star's habitable zone is packed full, making it impossible for another planet to orbit stably within the zone, the researchers said.


"The number of potentially habitable planets in our galaxy is much greater if we can expect to find several of them around each low-mass star — instead of looking at 10 stars to look for a single potentially habitable planet, we now know we can look at just one star and find several of them," team member Rory Barnes of the University of Washington said in a statement.


Gliese 667C is cooler and dimmer than the sun, making it possible for planets that have very close-in orbits to remain habitable. This star's habitable zone lies within an orbit the size of Mercury's around the sun, ESO officials said.

