Aristarchus suspected that this was the case and believed that the stars we see in the night sky are actually nothing more than distant suns.

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The rate of progress is so rapid that what one learns at school or university is always a bit out of date. Only a few people can keep up with the rapidly advancing frontier of knowledge, and they have to devote their whole time to it and specialize in a small area. The rest of the population has little idea of the advances that are being made or the excitement they are generating.

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The idea that we are alone in the universe seems to me completely implausible and arrogant, considering the number of planets and stars that we know exist, it's extremely unlikely that we are the only form of evolved life.

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I'm happy if I have added something to our understanding of the universe.

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We are in danger of destroying ourselves by our greed and stupidity. We cannot remain looking inwards at ourselves on a small and increasingly polluted and overcrowded planet.

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Scientific discovery may not be better than sex, but the satisfaction lasts longer.

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I think the human race has no future if it doesn't go into space.

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Do you ever wonder how much deeper the ocean would be without sponges?

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We don't let animals suffer, so why humans?

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People won't have time for you if you are always angry or complaining.

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