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| Personal background |
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Rennes, France, Earth (3rd Rock from the Sun ;-))
I've been wandering among galaxies for a long long time, choosen among my folk to explore strange new worlds, to seek out new life and new civilisations, to boldly go where no one has gone before...
Eventually, I came across a planet, emiting more radiations than any other I ever saw. It was revolving at the perfect distance from its star, so that a specific chemical was to be found in its liquid state. I was full of hope that I had at last found the world I was seeking for during all my voyage. The inhabitants of the planet call it 'the Earth'.
I decided I was to land, and started the manoeuvre. During the descent, I could not avoid a flying object, and ended on the surface of an ocean. I decided I had better hide in the depths of the sea, waiting for a rescue team to come. But it's been a long long time now, and none has come.
Then, I decided to observe Earthlings, and finally heard about SAH, and decided that my flight computer was absolutely capable of such computations...
May be I can help you get me home? |
| Thoughts about SETI and SETI@home |
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I'm absolutely sure ETs exist. But, that we find them or not, I'm not sure. There are lots of reasons why we are not to discover such signals.
- first, consider light speed. When we get the signal, and answer it, it would have been sent for such a long time that the ETs that sent it might not be listening any longer for an answer. They might as well be an extinct species when they receive the answer.
- second, consider power needed to send a signal. You have better send a beam (conical), rather than a radial signal, so that the energy is more concentrated, and the signal has a better chance to travel far away. What are the chances the earth is in such a beam? And what are the chances the signal is still powerfull enough to be distinguished among all parasites we receive from stars and other stellar objects? Third, where in the spectrum are the gonna send the signal? What are going to be the frequency, the shape, etc.. of such a signal? What tells us we're gonna be able to recognize it?
I'm not sure if human ought to transmit signals up there, for the same reasons as above. For now, we are unable to send humans beyond our satellite. Let's wait until we can go away from our sollar system, and then, let's say our neighbours we are able to communicate, and exchange with them! |
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