New Shepard: Bezos claims success on second spaceship flight
Elon's reaction (quoted from Twitter):<p>"Congrats to Jeff Bezos and the BO team for achieving VTOL on their booster<p>It is, however, important to clear up the difference between "space" and "orbit", as described well by <a href="https://what-if.xkcd.com/58/" rel="nofollow">https://what-if.xkcd.com/58/</a><p>Getting to space needs ~Mach 3, but GTO orbit requires ~Mach 30. The energy needed is the square, i.e. 9 units for space and 900 for orbit."