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Meteorite leaves trail of fire, confusion

Was the mark on this leaf caused by space debris?
Was the mark on this leaf caused by space debris?  


By Richard Stenger
CNN

(CNN) -- A streaking fireball or fireballs witnessed over much of the eastern United States seems to have disappeared without a trace, save perhaps for strange markings in a Pennsylvania cornfield.

A swath of stalks with possible burn pocks was cordoned off Tuesday, as state environmental authorities combed the area with radiation detectors.

Space enthusiasts -- including at least one from the air -- tried without luck to approach the guarded site. Shooting video from a helicopter, Jeramy Mohler swooped in close to the spot when someone with a megaphone told him to "move away from the contaminated area," he said.

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CNN's David George reports on a probable meteorite that gave much of the U.S. East Coast a show (July 24)

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Correspondent Robert Lange shows the Pennsylvania cornfield where the meteorite may have landed (July 24)

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CNN talks to some eyewitnesses about the mysterious object (July 24)

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RESOURCES
CNN Access: 'Star Gazer' host talks about fireball in Northeast  
 

The scene had been abuzz since the early evening before. From Ontario to Virginia, eyewitnesses saw a brilliant, colorful fireball blaze across the sky between 6 and 6:30 p.m. EDT. Some reported hearing a loud sound or series of sounds akin to sonic booms.

Shortly thereafter, witnesses watching deer near Williamsport, Pennsylvania, said they saw a fireball fall into the cornfield. A volunteer at the Larry's Creek Fire Department went to the scene.

Curled corn, dark rocks

"There was an obvious patch, about 25 yards by 50, that was covered by ash and was knocked down. The corn had bb-like holes in it and some of it was curled," said A.J. Edkin, a department safety officer, recounting the description of her colleague.

But did something really land there and, if so, what? Meteorite fragments have yet to be recovered. The corn, first described as flattened, scorched and dusted, had rebounded to an almost pristine condition by the morning. Air quality and radiation checks turned up nothing.

Not that they would.

"You're not going to see any signs of radiation with a meteorite," said meteorite expert Ron Baalke. "People think they are radioactive and they are not."

Instead searchers should look for "dark rocks with dark fusion crust, basically the result of burning up in the outer layer of the atmosphere," he said.

"This fireball is a very good candidate for having landed on the ground as a meteorite. It has all the classic sounds of a meteorite fall," the NASA scientist said.

So far only a few black singe marks on individual stalks and the hint of recent turbulence suggested something was amiss. Local emergency personnel concluded that a meteorite had struck the cornfield. But state authorities said they were not inclined to pursue an investigation.

"Some cornstalks have been blown over, but they don't seem burned. There's not much to look at," said Marko Bourne, spokesperson for the Pennsylvania Emergency Management Agency, on Tuesday.

"There are a few (cornstalks) that looked withered. It might have been totally unrelated to what was traversing the sky last night."

Richard R. Erickson, an astronomy professor at nearby Lycoming College, thinks there definitely was a connection.

"My wife and I heard a loud noise. We thought it was a sonic boom of some sort," he said. "I'm almost certain it was some kind of meteor."

Erickson and other astronomers speculate that a speeding meteor pierced the atmosphere, broke into parts as the atmosphere heated it and slowed it to well under the speed of sound.

Single meteorite theory

Eyewitnesses described the object as large as an SUV or even airplane. But astronomers said the object or its main pieces were most likely much smaller.

The field where some witnesses say the meteorite hit
The field where some witnesses say the meteorite hit  

"When you have a small object traveling at an incredibly high velocity, slamming into the earth's atmosphere, the friction makes the speeding object heat up so much that it can internally fracture and turn into what we call a fireball," said Jack Horkheimer, director of the Miami Planetarium.

"You don't need a big object. Something the size of a golf ball, a baseball, or even a basketball could look as big as a jeep or flaming bus."

Many mysteries remain. Conflicting accounts on the time and direction of the fireball have given rise to speculation that more than one space object stunned onlookers Monday.

Most eyewitnesses said the object traveled from the north to the northwest, but at least one said it went from east to west. And many of the sightings could be grouped into one of two distinct time periods -- just after 6 p.m. EDT and one between 6:25 p.m. and 6:30 p.m. EDT.

Perhaps it was a mini-meteor shower?

"There are three minor meteor showers going on, one known for slow moving but very bright fireballs," said Horkheimer. However, he and other astronomers leaned toward the lone-meteor theory, attributing eyewitness inconsistencies to human error.

'Seekers and lookers'

Another question puzzling astronomers -- did the object or objects land? There is a good chance that none of the parts survived long enough to reach the ground.

 Confused by space rock terms?
  • A meteoroid is a pebble or stone in space.
  • A meteor is the bright flash of light that a meteoroid produces as it streaks across the sky and also refers to the stone itself while in the atmosphere.
  • A meteorite is a meteor that survives its fiery atmospheric entry and strikes the Earth's surface.
  • "I don't think a meteorite per se could scorch the field like that. If it somehow exploded above the ground, it could have generated a heat pulse that could have scorched the ground," Erickson said.

    And if they did, they could have struck great distances from the cornfield, Baalke added.

    Nevertheless, Lycoming County emergency personnel kept the location of the field under wraps to prevent the curious from tromping through the corn.

    "We've not given the name of property owner because of the seekers and lookers," Edkin said.

    CNN Science and Technology Executive Producer Peter Dykstra contributed to this report.






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    • NASA: Asteroid Comet Impact Hazards
    • International Meteor Organization
    • The American Meteor Society
    • Sky and Telescope's Meteor Page
    • North American Meteor Network Home Page

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