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Henry Spencer Quotes

Canadian - Scientist | 1955 -

The Moon may not be quite as appealing as Mars, but it's still a complex and poorly understood world, with many questions still unanswered.

Moon World Questions Mars Complex

In 1960-61, a small group of female pilots went through many of the same medical tests as the Mercury astronauts and scored very well on them - in fact, better than some of the astronauts did.

Medical Small Better Group Same

NASA has never had a problem finding capable people to be astronauts. NASA's problem was, and still is, finding ways to cut the list of capable applicants down to a manageable length.

People Problem Finding Down NASA

Spaceflight, especially in the Mercury spacecraft, clearly wasn't going to be much like flying an airplane.

Airplane Flying Clearly Going Like

Not until the space shuttle started flying did NASA concede that some astronauts didn't have to be fast-jet pilots. And at that point, sure enough, women started becoming astronauts.

Women Space Flying Enough NASA Sure

Since SpaceX's very beginnings, they have talked about recovering and reusing at least the first stages of their rockets.

First Beginnings Stages Very Least

The Orion capsule uses an escape system quite like that of the Apollo spacecraft in the 1960s and 70s: an 'escape tower' containing a solid-fuel rocket that will pull it up and away from Ares I in a pinch.

Space Escape Will Up Tower Rocket

Solid-fuel rockets can't easily be shut down on command.

Down Command Shut Rockets Easily

Whether solid rockets are more or less likely to fail than liquid-fuel rockets is debatable. More serious, though, is that when they do fail, it's usually violent and spectacular.

Space Serious More Fail Solid Than

Past experience, on the shuttle and the Titan rockets, suggests that large multi-segment solid rockets have a probability of failure of 0.5 to 1 per cent.

Failure Experience Past Probability

Sometimes people wonder why aeroplanes are so cheap and rockets are so expensive. Even the most superficial comparison shows one obvious difference: aeroplane engines use outside air to burn their fuel, while rockets have to carry their own oxidisers along.

Space People Wonder Burn Sometimes

Rocket engines generally are simpler than jet engines, not more complicated.

Complicated More Rocket Than Simpler

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