The pilots spotted fast flying objects and bright lights in the sky
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The Irish Aviation Authority is investigating reports of bright lights and UFOs off the south-west coast of Ireland.
The Irish Aviation Authority is investigating reports of bright lights and UFOs off the south-west coast of Ireland.
It began at 06:47 local time on Friday 9 November when a British Airways pilot contacted Shannon air traffic control.
She wanted to know if there were military exercises in the area because there was something "moving so fast".
The air traffic controller said there were no such exercises.
The pilot, flying from the Canadian city of Montreal to Heathrow, said there was a "very bright light" and the object had come up along the left side of the aircraft before it "rapidly veered to the north".
She was wondering what it could be but said it did not seem to be heading for a collision.
Another pilot from a Virgin plane joined in and suggested it might be a meteor or another object re-entering the earth's atmosphere.
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He said there were "multiple objects following the same sort of trajectory" and that they were very bright.
The pilot said he saw "two bright lights" over to the right which climbed away at speed.
One pilot said the speed was "astronomical, it was like Mach 2" - which is twice the speed of sound.
What could it have been?
Apostolos Christou, an astronomer from the Armagh Observatory and Planetarium, said what the pilots saw was probably a piece of dust entering the earth's atmosphere at very high speed.
"It was most likely what are commonly called shooting stars," he said.
"It appears the matter was extremely bright so it must have been quite a large piece of material.
"I cannot say from the pilots' description, but it could have been the size of a walnut or an apple."
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The astronomer said November tended to be a very busy month for such activity.
"It also appears there were bits coming off the object and flying past the aeroplane, that is also what you would expect if it was a particularly large rock from space hitting the atmosphere, it would tend to fragment."
"Following reports from a small number of aircraft on Friday 9 November of unusual air activity the IAA has filed a report," the Irish Aviation Authority (IAA) said.
"This report will be investigated under the normal confidential occurrence investigation process."
A spokesperson for Shannon Airport said it would not be appropriate for the airport to comment while the IAA investigation is ongoing.
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