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David Hammen

I'm an ex-ex-rocket scientist. I briefly left the NASA fold to work at a startup filled mostly with similar ex-rocket scientists. We applied what we learned about making rockets reliably, economically, and safely move from point A to point B to all kinds of other devices that move from point A to point B. I came back to the NASA fold because, in hindsight, that was not the best time to make the jump to oil and gas (upstream).

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40 Is it possible that the shadow of The Moon is a single dot during solar eclipse? Sep 15 '19
36 Why is there so little nitrogen in the Martian and Venusian atmospheres? Jul 3 '20
31 How was the mass of Venus determined? Sep 27 '20
31 How is it possible that Saturn's gravitational acceleration felt by Mimas is stronger than Mimas' own surface gravity? Sep 14 '20
30 How many times brighter would full-earth-shine appear to people standing on the moon, than full-moon-shine does to people on earth? Feb 8
30 What will the PRECISE time of the Summer Solstice 2020 be? Jun 20 '20
30 Why can't our Sun be a binary with Jupiter as a T or Y dwarf? Jun 5 '16
28 Why are the time zones calculated as 360°/24 and not 361°/24 or 360°/23.933? Sep 26 '20
28 Why does the Earth have a z-component at the start of the J2000 epoch? Jul 14 '19
28 Will Earth lose the Moon before the Sun goes into supernova? Nov 20 '14
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