What Lawrence Krauss's entertainment does in spades is provide pleasure: delight in the clarity of the physics needed for space travel delight in the hypothetical challenges of really going somewhere far away and long ago in the galaxy delight, too, in the sheer zest and generosity of the Star Trek world, where the impossible happens every day, aliens always speak English, phasers are always to stun and Scotty is always saying "But I canna change the laws of physics, Captain!" This is not killjoy stuff, quite the reverse. Of course it would need to burn just as much to slow down when it got to wherever it was going, not that the captain or crew would really care, because the G-forces required to accelerate to half the speed of light would have reduced all of them to a paper-thin mush of blood, skin and bone smeared round the starship's bridge. To accelerate even to half the speed of light, Enterprise must burn 81 times its entire mass in hydrogen fuel. Travel for the starship Enterprise, of course, would impose fierce energy demands.
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