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Unlike Mars, early Earth was an ocean planet with exposed volcanoes and protocontinents that resembled shallow oceanic plateaus.
Because we live on an ocean planet.
On an ocean planet, we are wrecking the ocean.
The Earth's oceans would be measurably less acidic — and we are, after all, an ocean planet.
So, just as a refresher, it's always good to remember that we live on an ocean planet.
Gliese 1214b, which orbits the star Gliese 1214, forty-two light-years away, is thought to be a steamy ocean planet, with a thick atmosphere and seas hundreds of miles deep.
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With such a narrow range for habitability, ocean planets may not make as much of a splash as we thought when it comes to welcoming life.
According to Lammer et al. (2011b) such examples may be: dense hydrogen envelopes which remained from the primordial nebulae; hydrogen-rich thermospheres produced via dissociation of CH4, NH3 and H2O molecules; ocean planets or planets which evaporate their initial H2O reservoir; evaporation of H2O oceans due to cometary or aster-oidal impacts.
dense hydrogen envelopes which remained from the primordial nebulae; hydrogen-rich thermospheres produced via dissociation of CH4, NH3 and H2O molecules; ocean planets or planets which evaporate their initial H2O reservoir; evaporation of H2O oceans due to cometary or aster-oidal impacts.
If super-earths have more than 80 times as much water as Earth then they become ocean planets with all land completely submerged.
Low-mass low-density planets could be ocean planets or super-Earths with a remnant hydrogen atmosphere, or hot planets with a steam atmosphere, or mini-Neptunes with a hydrogen-helium atmosphere.
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