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No alien invasion for now? Study says life on nearby planets may not advanced enough to attack Earth

Scientists believe life on alien worlds may be constrained by the same factors as on our planet.
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What would aliens really look like? Here's what the science says. And no, it's not little green men.

The search for alien life has captured the popular imagination for decades. Are they friendly… intelligent… green? The average person may conceive of alien life as anything from the large-brained ...