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Why dont extraterrestrials make themselves known on a public scale?

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1) Maybe they don't exist.
2) Maybe they aren't advanced enough to travel so far.
3) Maybe they are scared.
4) Maybe they don't want to.
5) Maybe they already have. :)

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6 If they are advanced enough to travel this far, what would a non advanced species like ourselves offer to them?
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One would imagine Sherry, that is why there are "abductions" haha. I would think they would want to learn about us. Just like we would want to learn about them.
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I don't think it would take them long to learn about us, if they were advanced enough to come light years to get here. I just think I agree with Stephen Hawking, trying to make contact with them would be too risky for our species.
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They are extremely cowards....

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Interstellar travel takes a huge amount of time and energy. Assuming sufficiently advanced aliens exist, they would have to have a very good reason to spend the time and energy coming here. They also may not be capable of surviving in our gravity or our atmosphere. In addition, being exposed to an alien ecology would be extremely dangerous, for us as well as them.

The most likely reason I can think of for aliens to visit our solar system is to harvest the Sun. I personally hope there is no civilisation in the universe that is more advanced than ours.

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Well harvest food, harvest slaves, there are suns all over the place unless this was just like refueling stop between suns.
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Our sun just might be the most convenient one to harvest. Food and slaves can be created from suns. No need to harvest them if you're able to do this.
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