A former NASA astronaut has claimed to have personally witnessed two metal balls flash past his plane over Texas.
Leroy Chiao was 9,000 feet in the air during his 2004 and 2005 missions to the ISS when he saw the objects.
One of them flew over the other, he said, the Mail Online article noted.
The astronaut said he was lucky they didn't hit his plane.
Chiao estimated that the balls could have been about six meters away from him.
The astronaut stressed that if the objects had hit the plane, things could have ended badly.
Chiao said: “It happened so fast that I wasn’t even scared.”
A NASA veteran has suggested that the strange metal balls may be evading detection.
“The radar can’t detect them, so the service didn’t warn them,” he explained.
Chiao also admitted that he was puzzled by the objects that flashed in the immediate vicinity of the plane.