This means that at earlier times objects would have been closer together. In fact, it seemed that there was a time, about ten or twenty thousand million years ago, when they were all at exactly the same place and when, therefore, the density of the universe was infinite.

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contains on average some one hundred billion stars. If a star were a grain of salt, you could fit all the stars visible to the naked eye on a teaspoon, but all the stars in the universe would fill a ball more than eight miles wide.

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We are all now connected by the Internet, like neurons in a giant brain.

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Teori relativitas umum Einstein menyiratkan bahwa alam semesta harus punya permulaan dan, mungkin akhir.

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I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.

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The rate of progress is so rapid that what one learns at school or university is always a bit out of date.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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We should seek the greatest value of our action.

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remember to look up at the stars

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Galileo, perhaps more than any other single person, was responsible for the birth of modern science.

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There is no unique picture of reality.

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