Space probe Philae is actually a UFO attempting to make contact with humans, conspiracy theorists are claiming.
Ufologists claim the European Space Agency's (ESA) craft, which on Wednesday completed the extraordinary feat of landing on a speeding comet, is of alien origin.
An email published on the website UFOSightingsDaily.com claimed the agency had joined forces with NASA to "cover-up" the celestial body's true extra-terrestrial nature.
The email, purportedly written by a secret whistle-blowing ESA employee of the ESA, reads: “Do not think for ONE MOMENT that a space agency would suddenly decide to spend billions of dollars to build and send a spacecraft on a 12-year journey to simply take some close-up images of a randomly picked out comet floating in space.”
“Comet 67P is NOT a comet.
“Some 20 years ago Nasa began detecting radio bursts from an unknown origin out in space.
"It would later be known that these had likely come from the direction of the now named comet 67P.
"It does show signs on its outside of machine like parts and unnatural terrain.”
Ending on an ominous note, it adds: “Whatever this object is, it did not ask to be found or scrutinised.”
Ufologist Scott Waring said he believed the signals being emitted from the comet were a “greeting” to humans.
He added: “If it was a warning, they would not allow the ESA craft to have landed.
“I believe the landing of the ESA craft was the equivalent of a first handshake.
"They will make another move soon probably.
"Alien structures are on the comet.
"I don’t believe it’s natural.”
ESA has confirmed that the comet is emitting a "mystery song" - however, this has only fuelled theories that it is a UFO attempting to make contact with Earth.
Mr Waring added: “In my opinion this is not a code.
"It is how a species of aliens communicate to one another without speaking.
"A form of telepathy put into primitive radio signals.
"It's the only way this species can communicate to us.
"This is their thoughts.
"They don’t talk.”
He concluded: “Getting a copy of the full message and then translating it should be of utter importance.
"Is it a message of greetings?
"Or is it a warning of what’s to come?
"We, the people of the world, need to find out.”
The £173million European space agency (Esa) probe, which has already sent back detailed pictures, made history by landing on two-and-a-half-mile-wide 67P/Churyumov-Gerasimenko after a 10-year voyage on the Esa's Rosetta satellite.