2007-03-16 11:30:32 · 5 answers · asked by Giggly Giraffe 7 in Science & Mathematics ➔ Astronomy & Space
It depends on their level of technology. If they are sufficiently advanced to travel interstellar distances, they might be able to remain undetectable.
So far we've seen no verifiable evidence of other sentient species. That said, I believe with some certainty that somewhere in our galaxy at some past, present, or future time, a sentient species did/does/will exist.
Why haven't we heard from them?
Perhaps they are not technologically advanced enough to be heard. They may be mastering stone knives right now, or experiencing their own Rennaisance.
Perhaps they are here right now. Any species sufficiently advanced to travel interstellar distances would be able to hide or masquerade with ease. That Boeing 737 that just flew by may be a surveillance craft.
Perhaps they are so far away they will never notice us and vice versa.
Perhaps they existed a million years ago and died out.
Perhaps they will exist a million years from now.
It is really impossible to know for sure.
The Drake Equation suggests that there is sentient life out there. The Fermi Paradox casts doubt. Play around with the calculation form at the second link and see what you think.
2007-03-16 11:54:26 · answer #1 · answered by Otis F 7 · 2⤊ 0⤋
It is the huge distance that causes the problem,the antennas must be very high gain and that means a very narrow beam width. The chance that we and they will be looking down the narrow beam at the same time not a chance, The earth is rotating 15 deg per hour so the beam is sweeping across everything very rapidly . That is only in 1 plane now go to a full 4 dimension .If u heard something it would be gone before u could check your instruments. Take the sun we don't get even 1 deg of its energy and that is only 93 million miles. When y go a few light years apart it is impossible.
2007-03-16 20:48:05 · answer #2 · answered by JOHNNIE B 7 · 1⤊ 0⤋
i don't really believe in aliens but i think if there were any their technology would be entirely different than our own and we wouldn't have any way of detecting it.
2007-03-16 18:42:40 · answer #3 · answered by FengHuaXueYue 6 · 0⤊ 0⤋
We can't detect someone watching us.
2007-03-16 18:44:36 · answer #4 · answered by eri 7 · 0⤊ 0⤋
no tools can help us because their is no such thing as aliens.
2007-03-16 18:39:03 · answer #5 · answered by Stunnig' 2 · 0⤊ 1⤋