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eta-Earth
eta-Earth
ηE
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Exoplanets
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Looking for Another Earth? Here Are 300 Million, Maybe - The New York Times
https://www.nytimes.com/2020/11/05/science/astronomy-exoplanets-kepler.html
2003 Spitzer Space Telescope (SST)
2009 Kepler space telescope
2013 Gaia (spacecraft)
2018 Transiting Exoplanet Survey Satellite (TESS)
Drake Equation
eta-Earth