0.9g-1.1g easily completed: There are water worlds every 315 LYs, tidal wave ice balls aggregating rocky worlds each 95 LYs, medical atmosphere nitrogen Earths each 120 LYs. If we terraformed a sulfur oceania we'd be able to do 1.1% Ammonia in the future for ourselves instead of 0.1%, and 2.5% for animals instead of 1.5%. Thus water worlds every 30 LYs.
There is a 1.1g ice ball near Mizar where radiation is less; it would take a millenia to find good rocks but Oceania would take the same to be suit breathable removing 1/2 the exposed sulfur. 45 LYs out the USA's hot world has two moons to teleoperate Nitrogen based materials to remove metal gases that would only subsequently outgas upon surface impact/quake/industry. An Earth2 168 LYs away has mountains 2/3s easy clathrates needed to be levelled to keep an oxygen atmosphere. Their white sun looks 1/2 our's size. Nitrogen from 10 LYs away. -30C 200 LYs Neptune needs power and materials to service but longevity is better for every lifeform after habitating the Insurrection world for a millenia. They are 70 LYs apart. Ammonia terraforming gets decent in a million yrs, around the same time oceans can be made. Nitrate terraforming will be NASA's in a millenia, around the time it will be technically ready for the cooker. Rare Earth missed Sulfur outcompetes water and ammonia toxic chain reactions, and Nitrogen kills toxic oxides, so we are good in space, just strung out for 100k-1M yrs. The two best are still 100 LYs to close to Betelgeuse. Exobiology should get burrowing mammals at -1C Earth2.
There is a 1.1g ice ball near Mizar where radiation is less; it would take a millenia to find good rocks but Oceania would take the same to be suit breathable removing 1/2 the exposed sulfur. 45 LYs out the USA's hot world has two moons to teleoperate Nitrogen based materials to remove metal gases that would only subsequently outgas upon surface impact/quake/industry. An Earth2 168 LYs away has mountains 2/3s easy clathrates needed to be levelled to keep an oxygen atmosphere. Their white sun looks 1/2 our's size. Nitrogen from 10 LYs away. -30C 200 LYs Neptune needs power and materials to service but longevity is better for every lifeform after habitating the Insurrection world for a millenia. They are 70 LYs apart. Ammonia terraforming gets decent in a million yrs, around the same time oceans can be made. Nitrate terraforming will be NASA's in a millenia, around the time it will be technically ready for the cooker. Rare Earth missed Sulfur outcompetes water and ammonia toxic chain reactions, and Nitrogen kills toxic oxides, so we are good in space, just strung out for 100k-1M yrs. The two best are still 100 LYs to close to Betelgeuse. Exobiology should get burrowing mammals at -1C Earth2.
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