Hubble uses Earth as proxy for identifying oxygen on potentially habitable exoplanets

ScienceDaily
Aug 6, 2020, 12:28 pm62 pts
Taking advantage of a total lunar eclipse, Hubble used the Moon as a mirror to study sunlight that had passed through Earth's atmosphere. As a result, Hubble detected Earth's own brand of sunscreen - ozone - in our atmosphere. The technique simulates how scientists will search for evidence of life on planets…

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