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Asked by to Aimee, Chris, Dave, Greig, Laurence on 19 Jun 2014. This question was also asked by .
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Laurence Perreault Levasseur answered on 19 Jun 2014:
There are no proof that aliens exist or don’t exist. Because there are so many stars and planets in our galaxy, we strongly suspect that life, in one form or an other, exists somewhere else than the Earth. But we don’t know for sure yet.
About unicorns, well, they are pretty common, they just go under a different name:
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Dave Jones answered on 20 Jun 2014:
We haven’t found life on any planet other than the Earth… yet. But, that doesn’t mean that there aren’t any aliens. Aliens would be difficult to find. You have to think about how you would detect aliens if they were on another planet, and maybe the best way to think about that is to consider how aliens would detect us. How would they notice us? Probably from all the radio waves we emit into space (from our TV antennae, from radio antennae, communications, everything!). But, just as we know with our mobile phones that signal doesn’t always travel so far (I hate it when I can’t get a signal on my mobile, don’t you?). So, they’d probably need to be quite close (in astronomical terms, which means inside our Galaxy at least). Even more difficult we have to think about how long we’ve been producing radio waves, we only started with radio and tv etc. in the last hundred years or so, meaning that those radio waves can only have travelled about a hundred lightyears and so only aliens within one hundred lightyears of us will have picked up our radio signals. That really reduces the number of planets where they might have seen us!
So, if we think about the same thing for aliens, we’d also only be able to notice them on a very small fraction of the planets out there and there are a lot of planets! So, maybe there are aliens, just we have had no chance of finding them so far!
As for Unicorns, I’ve never seen one but that doesn’t mean they don’t exist! 😉
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