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Video: Trevor Noah's Take on Trump's Acquittal, McConnell's BS Excuse & MAGA's Celebrations

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O say, does that Star Spangled Banner yet wave..2/16/2021 10:29:42 am PST

re: #14 retired cynic

NASA’s Mars rover, Perseverance, aims for dicey landing to search for ancient life
Seven minutes of terror: “Success depends on everything going right, down to fractions of a second” (WaPo)

Mars landings are incredibly tricky affairs because the atmosphere is so thin, so vehicles have to be able to slow themselves down in addition to aerobraking and provide sufficient downward thrust to keep the thing from just falling to the ground when its forward momentum is too slow to generate lift.