Cover Page Star Chart Photograph Radial Velocity Habitable Zone Orbits System Data Planetary Life? Further Info Over 20 light-years away, Earth-like planets?

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Cover Page Star Chart Photograph Radial Velocity Habitable Zone Orbits System Data Planetary Life? Further Info Over 20 light-years away, Earth-like planets? Credit: ESO

Cover Page Star Chart Photograph Radial Velocity Habitable Zone Orbits System Data Planetary Life? Further Info Location R.A.: 15h19m26s Dec: -07d43’20”

Cover Page Star Chart Photograph Radial Velocity Habitable Zone Orbits System Data Planetary Life? Further Info Image ca. 20 arc minutes wide. Credit: DSS

Cover Page Star Chart Photograph Radial Velocity Habitable Zone Orbits System Data Planetary Life? Further Info Credit: ESO

Cover Page Star Chart Photograph Radial Velocity Habitable Zone Orbits System Data Planetary Life? Further Info Credit: ESO

Cover Page Star Chart Photograph Radial Velocity Habitable Zone Orbits System Data Planetary Life? Further Info Orbits

Cover Page Star Chart Photograph Radial Velocity Habitable Zone Orbits System Data Planetary Life? Further Info Constellation:Libra Spectrum:M3 Age vs Sun:nearly 2x Distance:20.4 ly Magnitude:10.6 mv Sun masses:0.31 Sun radii:0.38 Sun luminosity: Temperature:3,250 o K Sun magnitude:3.81 mv Earth masses:15.65 Distance:0.04AU Period:5.37 d Eccentricity:0 Earth masses:5.36 Distance:0.07AU Period:12.93 d Eccentricity:0.17 Earth masses:7.09 Distance:0.22AU Period:66.8 d Eccentricity:0.38 b c d Star cataloged as Gliese 581 1AU = mio km (93.5 mio miles) System Data Earth masses:1.94 Distance:0.03AU Period:3.15 d Eccentricity:0 e

Cover Page Star Chart Photograph Radial Velocity Habitable Zone Orbits System Data Planetary Life? Further Info Is Life out there on ‘c’ and ‘d’? Pros: Super-Earth-class size Situated in Gliese 581’s HZ Existence of liquid water possible Grainy or ocean covered surface Cons: Radiation impact from the star Probably tidally locked Anyway: The system is “only” 20.4 light-years away and therefore a travel target for the future by when our successors will know more about this planetary system, which may count more than the four planets known to date. Suppose it would be possible to travel near the speed of light, the journey would take about 6.1 years one-way at 1g acceleration. Credit: ESO

Cover Page Star Chart Photograph Radial Velocity Habitable Zone Orbits System Data Planetary Life? Further Info Further information: The Crowded Universe by Alan Boss on Fora TV The Extrasolar Planet Encyclopaedia Planetquest The Kepler Mission