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If a civilization discovered that they weren't confined to their own solar system, they would also assume that other civilizations weren't confined to their solar systems.It would make sense that they would at least also invest in defense.However, if the trip out of one's solar system is takes a Herculean effort, then it is quite possible that they would not be able to arrive at the destination in force. Certainly not with an overwhelming force to conquer with.Of course, planting seeds for technological advancement might make the arrival more pleasant.
What interest would aliens have in coming here? Resources? They could get plenty nearer to home, so that's unlikely.
A new place to live? That's more likely, but they'd want to wipe out all life here first so that our bacteria can't harm them. How do you irradiate a planet? You'd never get every last bacterium as they're deep in the ground, but you could release tiny artificial bacteria of a safe kind (safe to the aliens) to destroy all the natural ones near the surface and maintain a permanent battle against them while the surface would be safe for the aliens to live on.
An alternative would be to knock something big into the Earth to melt the entire surface, then wait for it to resolidify.
Apart from that, another possible motivation for aliens interacting with us would be for cultural exchange, but that can all be done at a distance through radio communications.
[Quote from: David Cooper on 28/10/2013 17:39:15A new place to live? That's more likely, but they'd want to wipe out all life here first so that our bacteria can't harm them. How do you irradiate a planet? You'd never get every last bacterium as they're deep in the ground, but you could release tiny artificial bacteria of a safe kind (safe to the aliens) to destroy all the natural ones near the surface and maintain a permanent battle against them while the surface would be safe for the aliens to live on.We've been there too. Whisky and infected blankets. Beware of aliens bearing gifts.
If Earth was invaded, would hitting the "self destruct" button for our entire planet be an option?