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If alien civilizations exist, our technology may be primitive in comparison.

Since the U.S. governmentofficially released documents affirming the existence of unidentified flying objects (UFOs), the world has felt closer than ever to confirming alien intelligence in the universe. But while we're not there yet, scientists are beginning to take them more seriously, and one physicist thinks we've no other choice.

"I think it is a legitimate scientific question to ask where these UFO sightings are from," tweeted the renowned Theoretical Physicist Professor Michio Kaku of theoretical physics at the City College of New York. But he was quick to caution how we qualify the phenomenon, since that "does not mean that these UFOs are necessarily from another planet."

But he thinks it's a possibility we can't ignore.


To Professor Kaku, while we don't know what's behind the UFO phenomenon, we shouldn't rule out the possibility that alien intelligence is driving the mysterious objects, and that they might come from alien worlds. A common objection suggests that, even if an alien civilization exists on distant planets, the fact of the unimaginably long journey from there to here lowers the likelihood of alien visitors to nearly zero, statistically. But, to Kaku, this is short-sighted. The universe is incredibly old, and we've only possessed the means for space travel for a few decades. If we consider the possibility that alien races have had millions of years to develop propulsion technology, who knows how quickly they might skip from planet to planet.

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