Shulou(Shulou.com)11/24 Report--

On June 5, retired NASA astronaut Scott Kelly (Scott Kelly) stayed in space for more than 8100 hours. "it turned out to be a balloon," he said last week, referring to the UFO incident he had personally experienced.

UFOs always stimulate people's imagination and think more of extraterrestrial intelligent life. But Kelly, a retired NASA astronaut, said that many UFO sightings may be just eyes playing tricks on us.

Kelly is a member of a NASA team that held a meeting last week to discuss the UFO phenomenon. He described an early mission on which the radar controller in the backseat thought he had found a UFO.

"I remember one time I was flying near Virginia Beach and the radar controller in the back seat was convinced that we had just flown a UFO," Kelly said. "but I didn't see it. We turned around and looked. It was Bart Simpson-- a balloon."

In 2016, Kelly broke the record of 340 days in a row when humans stayed in space. Since then, his record has been surpassed by NASA astronaut Mark van der Hei (Mark Vander Hei), who stayed on the International Space Station for 353 days in a row.

Kelly recalled the thousands of hours he spent in space last week. "I often see something in space, and then I think,'it's really not like it used to be," he said. Every time I look at it long enough, I realize it's the atmospheric lens effect. "

The atmospheric lens effect can create optical illusions, such as the fact that the sun in the sky looks higher than it really is. According to NASA, this can actually increase the duration of sunlight exposure at the equator by five minutes.

Particles in the earth's atmosphere will cause light to refract, scatter and reflect, giving people visual illusions and distorting the observed reality.

"in fact, everything I see is flying behind the atmosphere," Kelly said. "due to changes in the atmosphere, its trajectory does not appear to be in a straight line."

NASA held a meeting last week to discuss UFOs and called for action to better collect data. So is the UFO real or just an illusion of the eyes?

"some people believe in the existence of UFOs, while others think that solving the problem itself is absurd," said David Spergel, the panel's chairman. "I think as a scientist, solving problems starts with 'what we don't know,' and then collects data and tries to validate it."

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