Former NASA astronaut Leland Melvin, 54, recently tweeted that he once saw “something, organic, alien-like” in the payload bay of the Space Shuttle Atlantis when he was working with colleague Randy Bresnik.

The revelations were made during a chat on Twitter with fans about his experiences in space after he was asked if he had ever seen any aliens or UFOs.

NASA later denied the incident claiming that it was just ice breaking away from the vessel.

In the Twitter exchange, Melvin wrote: “I have not seen [a UFO] in space or on the ground but thought I saw something organic/alien like floating out of the payload bay.

“Randy Bresnik and I called the ground to ask what it could be and it was ice that had broken off of the Freon hoses.

When Melvin was then asked if he thought NASA had just told him that to keep him calm, he replied: “Hmm I don’t think so, but you never know.”

He added: “I was about to say Houston we have a problem but know everyone spins-up when those words are uttered from a space vehicle.”

The Space Shuttle Atlantis flew “33 missions” before being retired in 2011.

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