'Alien Bugs' Discovered In Earth's Atmosphere

British scientists believe they have found small bugs from outer space in the Earth's atmosphere.

Extra-terrestrial? The scientists found this small organism on a balloon

Tiny organisms were discovered by University of Sheffield experts on a research balloon they had sent 27km (16.7 miles) into the atmosphere during last month's Perseids meteor shower.

The microscopic bugs were detected when the balloon landed back on the ground in Wakefield, West Yorkshire.

Bug number two: researchers say they are confident in their findings

But the scientists insist the samples could not have been carried from the Earth's surface into the stratosphere - the second layer of our atmosphere, which stretches up to 50km (31 miles) from the ground.

Strict tests were taken to avoid any contamination, they said.

This fragment of an organism was also found, scientists said

Professor Milton Wainwright, who led the team, said: "Most people will assume that these biological particles must have just drifted up to the stratosphere from Earth, but it is generally accepted that a particle of the size found cannot be lifted from Earth to heights of, for example, 27km.

"The only known exception is by a violent volcanic eruption, none of which occurred within three years of the sampling trip."

He went on: "We can only conclude that the biological entities originated from space.

The Perseids meteor shower pictured last month from Bulgaria

"Our conclusion then is that life is continually arriving to Earth from space, life is not restricted to this planet and it almost certainly did not originate here."

The findings are to be published in the Journal of Cosmology.

The stratosphere stretches as high as 50km over the Earth's surface

"If life does continue to arrive from space then we have to completely change our view of biology and evolution," Prof Wainwright added. "New textbooks will have to be written."

He said further "crucial" tests on the samples are planned and researchers will carry out further experiments during a meteor shower in October.

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