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Originally Posted by schneemann
Apparently you don't know much about who uses high powered telescopes and where. You somehow assume that they're all used by the government or NASA.
Long distance space travel would most assuredly require an extremely fast vehicle. No object can travel faster than the speed of light. The nearest star is 4 light years away and the nearest star capable of supporting life is probably HUNDREDS of light years away.
Let's say we engage your fantasy notion that such a craft could be built to attain such speeds, you're still talking about at least a generation or two going by before the spacecraft reaches its destination. In terms of aliens coming HERE, that would be like finding a needle in the haystack. Think about it: to come here requires knowing that HERE is a destination worth coming to.
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Ok first all recently us primitive humans has possibly found a planet capable of sustaining life. It's not out of the realm that a alien culture hundreds if not thousands of years more advanced has even better detection abilities. Not to mention for at least 60 years we have been sending out TV signals across the galaxy. Even an alien society only as advanced as ours would be able to locate where our signals are coming from.
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b) Large enough to hold whatever fuel powers such a craft over such long distances
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An engine based on nuclear fusion wouldn't take much fuel at all.
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c) Large enough to house the food and other sustenance necessary for such long distance travel
d) Large enough to hold the staff necessary to make such long distance travel.
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I'm not going to explain Einstein's theory of relativity, but sufficive to say a trip at light speed at would say take 4 years to get her from the nearest star would only seem like maybe weeks or even hours to anyone in a ship capable of going light speed. So no you wouldn't need many provisions. Also you assume such aliens need to eat and drink as often as we do.