” In the long run, it’s impossible to make progress without sometimes having setbacks, although people who get lucky on their first attempt sometimes forget this. “


” The communications delays between Earth and Mars can be half an hour or more, so the people on the ground can’t participate minute by minute in Mars surface activities. “


” 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. “


” 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. “



All 4 Henry Spencer Quotes about People in picture


In the long run, it
The communications delays between Earth and Mars can be half an hour or more, so the people on the ground can


NASA has never had a problem finding capable people to be astronauts. NASA
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.
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