Question for physicists/astronomers: in the ASTP mission, an artificial eclipse was created by one spacecraft viewed from another, in a vacuum. What's a minimum viable eclipse in vacuum? Would a space-walking astronaut holding up a thumb in front of the sun see the corona? https://twitter.com/gdsimms/status/1109902866498510848 …
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My understanding is yes: without any atmosphere to scatter light, you only need to cover the diameter of the sun and you'll be able to see the corona
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