NASA study reveals Venus crust surprise

I wonder if Venus could be terraformed via a sun shield placed in orbit around it. How big would it have to be to reverse the runaway greenhouse effect?

Venus probably doesn't have enough hydrogen to be of any use.

- "Several upcoming missions, including NASA’s DAVINCI (Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging)"

DAVINCI is actually cancelled in the latest budget request. For obvious reasons, the NASA press office (the OP) won't talk about this. But 50% of NASA's science funding is gone.

https://spacenews.com/white-house-proposal-would-slash-nasa-...

Part of the problem is having too much atmosphere. In the original Cosmos Carl Sagan talked about a hypothetical solution where we capture asteroids, and throw them at Venus in such a way that they just nick the atmosphere and knock large quantities of atmosphere out into space. One you reduce atmospheric pressure to a certain level, things could become habitable.

Then throw in iron form the atseroid belt to react with it to form carbonates. Venus is dry so brining in hydrogen form the outer planets would be necessary anyway to form wate r and thta will account for a good bit. Garden the surface so subsurface rocks which might react with the atmosphere cna absorb some. (Assumign the subsurface rocks are thta reactive.) Scoop it off with smaller versions of the same scoops used to harvets hydrogen from the gas giants.

Venus is a damned shame. Had planetary evolution gone just slightly differently, the solar system could have had two habitable water planets. Mars, owing to its size, was never going to cut it, but Venus might have.