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Astronomer Lisa Kaltenegger says telescopes currently being developed will soon be able to see whether GJ 357 d has life on its surface. The GJ 357 system has three planets that we know of. GJ 357 d is the third one from its sun and sits within the red star’s habitable zone. It could maintain liquid surface water under the right conditions. (Image: An illustration of planet GJ 357 d. Credit: Jack Madden / Carl Sagan Institute, Cornell University.)