7 Earth-Size Planets Orbit Dwarf Star, NASA and European Astronomers Say

Scientists could even discover compelling evidence of aliens.

“I think that we have made a crucial step toward finding if there is life out there,” said Amaury H. M. J. Triaud, an astronomer at the University of Cambridge in England and another member of the research team. “Here, if life managed to thrive and releases gases similar to that we have on Earth, then we will know.”

Cool red dwarfs are the most common type of star, so astronomers are likely to find more planetary systems like that around Trappist-1 in the coming years.

“You can just imagine how many worlds are out there that have a shot to becoming a habitable ecosystem,” Thomas Zurbuchen, associate administrator of NASA’s science mission directorate, said during a NASA news conference on Wednesday. “Are we alone out there? We’re making a step forward with this — a leap forward, in fact — towards answering that question.”

Telescopes on the ground now and the Hubble Space Telescope in orbit will be able to discern some of the molecules in the planetary atmospheres. The James Webb Space Telescope, scheduled to launch next year, will peer at the infrared wavelengths of light, ideal for studying Trappist-1.

Comparisons among the different conditions of the seven will also be revealing.

“The Trappist-1 planets make the search for life in the galaxy imminent,” said Sara Seager, an astronomer at the…

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