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In science, a healthy skepticism is a professional necessity, whereas in religion, having belief without evidence is regarded as a virtue.
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"Are we alone in the universe?" This is a question which goes back to the dawn of history, but for most of human history it has been in the province of religion and philosophy. Fifty or something years ago, however, it became part of science.
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The problem here is that a civilization that is 1,000 light years away doesn't know we exist. They don't know that we have radio telescopes here on Earth because they see Earth as it was 1,000 years ago. Nothing can travel faster than light, so however good their instruments they can't see in affect the future. So there is no particular reason they should be sending us messages at this time.
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The anthropic principle is an unfortunate name as it implies something about humanity.
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Matter is regarded as being constituted by a region of space in which the field is extremely intense . . . . . . There is no place in this new kind of Physics both for the field and matter, for the field is the only reality.
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Cancer is not something confined to human beings. It's found in all multi cellular organisms where the adult cells proliferate, so it's widespread in the biosphere. It's a phenomenon that is deeply related to the history of life itself, so by studying cancer I think we can illuminate the history of life itself and vice versa.
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If we do discover more than one type of life on Earth, we can be fairly certain that the universe is teeming with it, for it would be inconceivable that life started twice here but never on all the other earth-like planets.
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The Eerie Silence: are we alone in the universe?
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The question not many ask is: why are the laws of physics like they are?
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Supposing we knew that up there is some alien civilization and it's sending radio signals our way we should not tell the public where that is. We could say that we've picked up a signal, but we should not tell them where for the simple reason that anybody could commandeer a radio telescope, set themselves up as some self appointed spokesperson of mankind and start beaming all sorts of crazy messages back to the aliens.