Comments on: Questions Show: Stellar Roche Limits, Seeing Black Holes, and Water on Mars http://www.astronomycast.com/listeners/questions-shows/questions-show-stellar-roche-limits-seeing-black-holes-and-water-on-mars/ Take a weekly facts-based journey through the cosmos with Astronomy Cast. Thu, 18 Mar 2010 10:07:30 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: Sapjes http://www.astronomycast.com/listeners/questions-shows/questions-show-stellar-roche-limits-seeing-black-holes-and-water-on-mars/comment-page-1/#comment-1449 Sapjes Tue, 06 Jan 2009 21:30:08 +0000 http://www.astronomycast.com/?p=493#comment-1449 This beats an episode about the top 10 things Jesus would like to do in January! Thank you! This beats an episode about the top 10 things Jesus would like to do in January!

Thank you!

]]> By: Stewart http://www.astronomycast.com/listeners/questions-shows/questions-show-stellar-roche-limits-seeing-black-holes-and-water-on-mars/comment-page-1/#comment-1441 Stewart Mon, 05 Jan 2009 17:22:22 +0000 http://www.astronomycast.com/?p=493#comment-1441 lol, you messed up on "water on mars." It will boil and freeze at the same time. Basic physics: Enthalpy and phase diagrams. See youtube video: http://www.youtube.com/watch?v=yW5UeJtXxYA This also has an impact on your space suit podcast. The side of an astronaut away from the sun won't flash freeze from lack of solar radiation, but from evaporation. A person could easily withstand the radiative heat transfer to a 0K black body for hours. Simple Stefan–Boltzmann law (T^4). A man could survive quite awhile at ~ -20C (-8F). That is roughly 1/2 the radiative heat transfer compared to 32C (98.6F) as compared with 0K. It is the cooling caused by evaporation which would flash freeze the backside. Btw: Please don't mind the criticism, you guys are wonderful and I have learned a lot from you. lol, you messed up on "water on mars." It will boil and freeze at the same time. Basic physics: Enthalpy and phase diagrams. See youtube video: http://www.youtube.com/watch?v=yW5UeJtXxYA

This also has an impact on your space suit podcast. The side of an astronaut away from the sun won't flash freeze from lack of solar radiation, but from evaporation. A person could easily withstand the radiative heat transfer to a 0K black body for hours. Simple Stefan–Boltzmann law (T^4). A man could survive quite awhile at ~ -20C (-8F). That is roughly 1/2 the radiative heat transfer compared to 32C (98.6F) as compared with 0K. It is the cooling caused by evaporation which would flash freeze the backside.

Btw: Please don't mind the criticism, you guys are wonderful and I have learned a lot from you.

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