” Sure, there were hopes that Constellation’s systems could later be adapted to support more ambitious goals. But Apollo had those hopes, too. It didn’t work in 1970, and it wasn’t going to work in 2020. “


” Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it’s hard to make it pay off – Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap. “


” 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. “


” 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. “


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



All 5 Henry Spencer Quotes about More in picture


Sure, there were hopes that Constellation
Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it


The communications delays between Earth and Mars can be half an hour or more, so the people on the ground can
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
Rocket engines generally are simpler than jet engines, not more complicated.
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