How can the earth defend against an alien invasion?

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answers:
Megumi say: An ET alien invasion is impossible. Illegal aliens are invading other nations however.
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Jeffrey K say: We couldn't. We are just monkeys compared to advanced aliens with interstellar travel. Could baboons fight off aliens? Humans couldn't do any better.
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say: any alien spacecraft that reached here would be full of corpses, space travel will only be possible if we can conquer or step outside of time
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electricpole say: I keep a Slim Whtiman album on hand, for just such an emergency.
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sam say: you assume aliens behave like humans
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Princess say: According to the GOP, you just put up a wall.
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Michael say: We've got Randy Quaid, what else would we need?
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The Raging Platypus say: We couldn't. Any creature to get here across the vastness of space would be far, far , FAR more advanced than us.

This is why SETI is a stupid idea. It's like the Monty Python How To Hide sketch.
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Rejji say: You mean like us, the pollutants?
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Uncle Crizzay in da Hizzay! say: We will build a BIG BEAUTIFUL WALL around Earth, and we will have Uranus pay for it!
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Crazy Jon say: Best way is to just keep on trashing the planet. Then when the aliens arrive there won't be anything here worth having, and most likely no civilization or humans left, so they won't bother to invade. We'll have caused them tp make a very expensive wasted trip. Now that is strategy!
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CarolOklaNola say: E. Coli or cholera or Ebola.
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Edward say: We put Nancy Pelosi naked in front of their space craft that should repell them
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Edwena say: Stop using fossil fuels and eating meat.
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Dan say: Build a wall.
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