Fantastic, thank you so much! Beautiful and inspiring - and I wonder, what comet rate would be necessary to cause Venus' rotation? I suppose it would need to be added very slowly, to avoid frictional losses in the mantle... much to ponder!
If we use enough water to make 50% of Venus covered by water then these comets should hit Venus with 3% of speed of light (9 000 km/s). And a lot of energy would be dissipated in atmosphere, so it doesn't look like a good plan. Best option is to export current overdense atmosphere with mass drivers. Current atmosphere is 4 times heavier than possible 50% hydrosphere, so it's speed will be just 0.7% of speed of light. But in any case speeding up rotation of Venus is way more harder than cooling it, importing hydrosphere and making reasonable day-night cycle with orbital mirrors.
@@MrQwerty3131 Thank you for responding! :) And yes, orbital mirrors require minimal material, so they'd be available quickly, too. Thanks for running the numbers on that, as well. Another thought: if 'comets' are gently parachuted into the atmosphere (perhaps with fiberglass wing-body shapes, as silicon will be abundant in space), then Saturn's Dione or Rhea should provide enough specific heat capacity to cool the atmosphere rapidly, especially with help from a solar shade and floating venturi-plume towers. Solar shade alone was supposed to take a century or more, if I remember correctly. An ice moon would cut the time down significantly, and cycles of evaporation and condensation would speed radiant heat into space... Delta-v from Saturn to Venus, and machine-time cutting-up Dione would be the real costs.
Great video I have never seen before
Good stuff, very well done.
Fantastic, thank you so much! Beautiful and inspiring - and I wonder, what comet rate would be necessary to cause Venus' rotation? I suppose it would need to be added very slowly, to avoid frictional losses in the mantle... much to ponder!
If we use enough water to make 50% of Venus covered by water then these comets should hit Venus with 3% of speed of light (9 000 km/s). And a lot of energy would be dissipated in atmosphere, so it doesn't look like a good plan. Best option is to export current overdense atmosphere with mass drivers. Current atmosphere is 4 times heavier than possible 50% hydrosphere, so it's speed will be just 0.7% of speed of light. But in any case speeding up rotation of Venus is way more harder than cooling it, importing hydrosphere and making reasonable day-night cycle with orbital mirrors.
@@MrQwerty3131 Thank you for responding! :) And yes, orbital mirrors require minimal material, so they'd be available quickly, too. Thanks for running the numbers on that, as well. Another thought: if 'comets' are gently parachuted into the atmosphere (perhaps with fiberglass wing-body shapes, as silicon will be abundant in space), then Saturn's Dione or Rhea should provide enough specific heat capacity to cool the atmosphere rapidly, especially with help from a solar shade and floating venturi-plume towers. Solar shade alone was supposed to take a century or more, if I remember correctly. An ice moon would cut the time down significantly, and cycles of evaporation and condensation would speed radiant heat into space... Delta-v from Saturn to Venus, and machine-time cutting-up Dione would be the real costs.
Ok