WASHINGTON — Astronomers have found yet another planet that seems to have just the right Goldilocks combination for life: Not so hot and not so cold. It’s not so far away, either.
This new, big, dense planet is rocky, like Earth, and has the right temperatures for water, putting it in the habitable zone for life, according to a study published Wednesday in the journal Nature.
It’s the fifth such life-possible planet outside our solar system revealed in less than a year, but still relatively nearby Earth. Rocky planets within that habitable zone of a star are considered the best place to find evidence of some form of life.
“It is astonishing to live in a time when discovery of potentially habitable worlds is not only common place but proliferating,” said MIT astronomer Sara Seager, who wasn’t part of the study.
The first planet outside our solar system was discovered in 1995, but thanks to new techniques and especially NASA’s planet-hunting Kepler telescope, the number of them has exploded in recent years. Astronomers have now identified 52 potentially habitable planets and more than 3,600 planets outside our solar system.
The latest discovery, called LHS 1140b, regularly passes in front of its star, allowing astronomers to measure its size and mass. That makes astronomers more confident that this one is rocky, compared to other recent discoveries.
In the next several years, new telescopes should be able to use the planet’s path to spy its atmosphere in what could be the best-aimed search for signs of life, said Harvard astronomer David Charbonneau, a co-author of the study. If scientists see both oxygen and some carbon in an atmosphere, that’s a promising sign that something could be living.
Outside astronomers have already put this new planet near the top of their must-see lists for new ground and space-based telescopes.
“This is the first one where we actually know it’s rocky,” Charbonneau said. “We found a planet that we can actually study that might be actually Earth-like.”
Make that super-sized, because it belongs to a class of planets called super-Earths that are more massive than Earth but not quite the size of giants Neptune or Jupiter.
Compared to Earth, the new planet is big, pushing near the size limit for rocky planets. It’s 40 percent wider than Earth but it has 6.6 times Earth’s mass, giving it a gravitational pull three times stronger, Charbonneau said. A person weighing 167 pounds would feel like 500 pounds on this planet.
While many super-Earths are too big to have the right environment for life, 1140b is just small enough to make it a good candidate. Thirty-two of the potentially habitable planets found so far are considered super-Earth sized.
The new planet was found using eight small telescopes in Chile and help from an amateur planet-hunter, Charbonneau said.
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