Researchers announced Wednesday the stunning discovery of seven Earth-like planets orbiting a small star in our galaxy, opening up the most promising hunting ground so far for life beyond the Solar System.
All seven roughly match the size and mass of our own planet and are almost certainly rocky, and three are perfectly perched to harbour life-nurturing oceans of water, they reported in the journal Nature.
Most critically, their proximity to Earth and the dimness of their red dwarf star, called TRAPPIST-1, will allow astronomers to parse each one's atmosphere in search of chemical signatures of biological activity.
"We have made a crucial step towards finding life out there," said co-author Amaury Triaud, a scientist at the University of Cambridge.
"Up to now, I don't think we have had the right planets to find out," he said in a press briefing.
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