The danger of asteroid or comet impact is one of the best reasons for getting into space ... I'm very fond of quoting my friend Larry Niven: "The dinosaurs became extinct because they didn't have a space program. And if we become extinct because we don't have a space program, it'll serve us right!"

Our age is in many ways unique, full of events and phenomena that never occurred before and can never happen again. They distort our thinking, making us believe that what is true now will be true forever, though perhaps on a larger scale. Because we have annihilated distance on this planet, we imagine that we can do it once again. The facts are otherwise, and we see them more clearly if we forget the present and turn our minds towards the past.

I wanted to kill myself. I would have done it, too, if I had owned a gun. I was considering the gruesome alternatives — pills, slitting my wrists with a razor blade, jumping off a bridge — when another student called to ask me a detailed question on relativity. There was no way, after fifteen minutes of thinking about Mr. Einstein, that suicide was still a viable option. Divorce, certainly. Celibacy, highly likely. But death was out of the question. I could never have prematurely terminated my love affair with physics.

Some women, Commander Norton had decided long ago, should not be allowed aboard ship; weightlessness did things to their breasts that were too damn distracting. It was bad enough when they were motionless; but when they started to move, and sympathetic vibrations set in, it was more than any warm-blooded male should be asked to take. Some women, Commander Norton had decided long ago, should not be allowed aboard ship; weightlessness did things to their breasts that were too damn distracting. It was bad enough when they were motionless; but when they started to move, and sympathetic vibrations set in, it was more than any warm-blooded male should be asked to take. He was quite sure that at least one serious space accident had been caused by acute crew distraction, after the transit of a well-upholstered lady officer through the control cabin.

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The fates could not possibly be so malevolent, now that he had only a few hundred meters to go. He was whistling in the dark, of course. How many aircraft had crashed at the very edge of the runway, after safely crossing an ocean? How many times had machines or muscles failed when there were only millimeters to go? Every possible piece of luck, bad as well as good, happened to somebody, somewhere. He had no right to expect any special treatment.

And in its sky was such a sun as no opium eater could ever have imagined in his wildest dreams. Too hot to be white, it was a searing ghost at the frontiers of the ultraviolet, burning its planets with radiations which would be instantly lethal to all earthly forms of life. For millions of kilometers around extended great veils of gas and dust, fluorescing in countless colors as the blasts of ultraviolet tore through them. It was a star against which Earth’s pale sun would have been as feeble as a glowworm at noon.

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