In 2017, an international team of astronomers announced a momentous discovery. Based on years of observations, they found that the TRAPPIST-1 system (an M-type red dwarf located 40 light-years from Earth) contained no less than seven rocky planets. Equally exciting was the fact that three of these planets were found within the star’s habitable zone (HZ), and that the system itself has had 8 billion years to develop the chemistry for life.
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Source: Phys.org