Alien hunters have once again proved that there is no limit to their imagination.
The extraterrestrial enthusiasts believe NASA's Opportunity rover has spotted a dome on Mars, presumably built by an ancient civilisation.
Their theory stems from this rather unassuming photograph, published by NASA.
If you missed it, here is the the "alien dome" up close:
While the raised structure is most likely a rock, self-confessed ufologists have said that it can't be a product of " natural formation."
Conspiracy website, 'The Un-Silent Majority' stated: "The existence of domes on Mars proves that someone or something built them in the past.The existence of domes on Mars proves that someone or something built them in the past.
"... If the structure is observed more closely, it becomes obvious that small dark circles spread all over the base of the structure."
The site also mentioned hardcore UFO fans who believe NASA is operating a secret space program that has already sent astronauts to the red planet. Well, you can't fault them for lack of creativity.
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