Dr Jayadev Rajagopal, a Research Associate at NSFs National Optical-Infrared Astronomy Research Lab, revealed the reaction from the space agency workers when the discovery was made in 2010.
He said: “We all stepped back from the screen – in every image, it’s there.
“It’s in the shape of an X – an X in the sky.”
Mr Dellums went on to reveal the leading theory on what the structure could be.
He added: “The X-shape is not commonly found in astronomy, and the object is travelling at 11,000mph.