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David Hammen
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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
31 How is it possible that Saturn's gravitational acceleration felt by Mimas is stronger than Mimas' own surface gravity? Sep 14
30 What will the PRECISE time of the Summer Solstice 2020 be? Jun 20
29 Why can't our Sun be a binary with Jupiter as a T or Y dwarf? Jun 5 '16
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
28 Is the Earth-Sun distance 1.012 AU? May 18 '16
23 Why does the Parker Solar Probe slow down as the distance from the Sun increases? May 22
22 How did the Earth come to be in orbit around the sun? Jun 6 '16
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