Extraterrestrials are already here on Earth, disguised as humans or living in secret bases hidden underground or even on the far side of the moon, according to a shocking new scientific paper from Ivy League eggheads at Harvard University .

RadarOnline.com can reveal, the eyebrow-raising scholarly article suggests aliens are "concealed in stealth" or "even walking among us" in human form. It theorizes these ETs are a "remnant form" of an ancient civilization that made their home on Earth long ago, or maybe even time-travelers from the future. Article continues below advertisement

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"We're not saying this is right, we're not saying that this is absolutely 100 percent the case," said Mon

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