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Astronomie Hier geht's nicht nur um Astronomie im klassischen Sinne, sondern auch um all die Mythen, Geschichten und Prophezeiungen, die sich rund um Sterne, Kometen und andere Himmelskörper ranken.

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Alt 13.10.2003, 18:30   #1
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Böse "Feueriges Flugobjekt" - Meteor? (engl.)

Ok, wenn es kein Meteor war, was war es dann? "Weltraumschrott" vielleicht?

Hier klicken um bild zu vergrößeren

Bild 2 Vergrößern

Photo of Fiery Object Mystifies Scientists

By Robert Roy Britt
Senior Science Writer
posted: 07:00 am ET
13 October 2003

A digital picture of a spectacular and apparently explosive event in the sky fooled a pair of seasoned NASA scientists, has other researchers around the globe mystified, and made a minor celebrity of a teenage photographer.

Jonathan Burnett, 15, was photographing his friends skateboarding in Pencoed, Wales when one of them noticed a colorful fireball in the sky. Burnett snapped a picture, then sent it to NASA scientists and asked if they knew what it was.

Robert Nemiroff and Jerry Bonnell, who run NASA's Astronomy Picture of the Day (APOD), posted the photograph on Oct. 1 and wrote that "a sofa-sized rock came hurtling into the nearby atmosphere of planet Earth and disintegrated." They called the picture "one of the more spectacular meteor images yet recorded."

Problem is, it turns out, there was no meteor.

Rampant speculation

Meanwhile, the image and its caption made the Internet rounds and the story was picked up by the media. Interview requests for Jonathan came from the BBC and NBC, among others.

Semi-scientific discussions ensued as experts and amateurs debated the image in Internet and e-mail forums. Some initially labeled it a fraud. Others said it might be manmade space junk falling back to Earth, or maybe a military jet unloading fuel and igniting it with its afterburners.

During the discussion, the APOD scientists changed their caption, saying the picture likely had something to do with a jet contrail, a consensus that most other scientists had reached.

A second wider-angle picture, researchers learned, had been taken at the same time as the first photo. The second image, by Julian Heywood of Porthcawl, about 10 miles from Jonathan's location, helped form the contrail hypothesis and ruled out the idea that the first photo might have been fabricated.

Steve Salter, an aircraft engineer in the UK, suggested the contrail might have come from the Concorde, whose flight timing would have put it in the vicinity at the right time. Others deduced the same.

"I think the most likely explanation is that this is an unusual view of the Concorde's contrail," the APOD's Bonnell told SPACE.com late last week.

But nobody knows what generated the explosive appearance. It might just involve bright, reflected light rather than any sort of fiery reality.

Marco Langbroek of the Dutch Meteor Society thinks it could be what's known as a false Sun, when light from the setting Sun is refracted by the ice particles that make up a high-altitude contrail, which develops out of jet exhaust.

Better than a UFO

Adding to the confusion, the whole affair unfolded during a stretch of time when a host of real fireballs were generated by space rocks.

Five separate highly visible meteor events in one 8-day period in late September were mostly if not entirely unrelated, astronomers believe. In early September, the public was treated to a set of overblown stories about an asteroid that, for a time, had miniscule odds of hitting Earth in the distant future. So awareness was high, in the media and the public, when Jonathan Burnett's picture was first published.

While the photograph remains vexing, it is certain that everyone -- from the photographer to the mistaken NASA astronomers to the legions of other scientists and readers who followed the saga -- got an education.

"This will be well remembered by meteor and impact experts worldwide for some time I reckon," Langbroek wrote on CCNet, an electronic newsletter that moderated much of the discussion. He added that the whole affair has many lessons, chief among them that media and public awareness over the threat of rocks from space is growing.

"Clearly the UFO's of bygone days have given way to meteorite impacts as the popular explanation for strange celestial events with both public and press," Langbroek said.

Critical of NASA

Langbroek had harsh words for the APOD producers, who've been vetting and posting a picture a day for eight years. The pair has a loyal following and recently compiled their favorite images into a book.

"It is a bit worrying that apparently, within the team responsible for the NASA Astronomy Picture of the Day, nobody seems to have taken the care to contact an expert meteor astronomer first before declaring this publicly a certified 'daylight fireball' on their website," Langroek said. "NASA did not live up to its reputation" as "the major representative" for professional astronomers worldwide, he said.

Asked to respond, Bonnell said APOD has been "a constant learning experience" full of pleasant "and some not-so-pleasant" lessons.

"Of course, the bad press is disappointing," Bonnell said. "In the end it is a really exciting picture and I hope Jon Burnett is not too unhappy or discouraged that his image turned out to be of the Concorde contrail rather than a large meteor trail."

Jonathan just wants to know what's in the picture.

"We have lost count of the number of people who have emailed us with various explanations of what the picture could be of," Paul Burnett, Jonathan's father, told the BBC. He thought the matter rather funny. "A 15-year-old schoolboy has baffled scientists around the world with this picture."

Seeking a silver lining

Nemiroff, the co-producer of APOD, encouraged Jonathan in a private e-mail conversation to make the most of his experience.

"My final advice would be to write up a full report on what you have seen for school and keep a copy for yourself," Nemiroff suggested. "Ask your principal/headmaster/science teacher if you could receive some sort of special science credit for it. When writing up the report, try to discover for yourself what is the actual cause of the unusual cloud you photographed. Being a scientist is a lot like being an investigator."

Indeed. And the greatest mysteries are those that elude all manner of investigation.

This article is part of SPACE.com's weekly Mystery Monday series.

Die ganze Geschichte in deutsch
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Alt 13.10.2003, 18:41   #2
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Sie sind hieeer ...

Könnte Weltraumschrott oder ein kleiner Brocken aus kosmischem Staub sein.
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Alt 13.10.2003, 19:39   #3
Lebendes Foren-Inventar
Registriert seit: 20.04.2002
Beiträge: 3.540

Die neuesten Analysen sprechen eher für ein Flugzeug an dessen Außenhülle sich das Sonnenlicht spiegelte. Das wird z.b. auch hier ausgesagt. Das zweite Bild (dieses) soll übrigens eindeutig belegen, dass es sich nicht um einen Meteoriten handelt. Diese würden nicht eine solche Spur hinterlassen. Gegen einen Meteoriten spräche auch, dass ein ein entsprechend dem sichtbaren Ereignis großer Krater nicht entdeckt wurde. Ein Foto was bei den vielen Websiten gerne vergessen wird ist dieses:


Doch nur ein Flugzeug mit Kondensstreifen?
Zwirni ist offline   Mit Zitat antworten
Alt 13.10.2003, 20:00   #4
Lebendes Foren-Inventar
Registriert seit: 25.09.2002
Beiträge: 2.497

kann dir nur zustimmen zwirni.ist auch am wahrscheinlichsten.
wenn es weltraumschrott wäre müsste es ein ziemlich grosses teil gewesen sein.dieses wäre dann auch auf der erde eingeschlagen.aber meines wissens nach ist das hier nicht passiert.
Sereck ist offline   Mit Zitat antworten
Alt 15.10.2003, 18:27   #5
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UFO News
Fiery Object Mystifies Scientists

Was it an asteroid, a meteor - or was it just a plane?

Dateline: Tuesday, October 14, 2003

By: Phenomena News Editor
Source: Space.com

A recent photo of a fireball in the sky, taken by a skateboarding teenager, has made news across the globe - but still has scientists mystified. Most assumed that the fireball was a daylight meteor explosion , including the staff at NASA's popular website 'Astronomy Picture of the Day'. The APOD website posted the photograph on October 1st, writing that "a sofa-sized rock came hurtling into the nearby atmosphere of planet Earth and disintegrated...one of the more spectacular meteor images yet recorded."

The folks at APOD have been left with egg on their face however, as it turns out that the fireball was not a meteor at all. But while other scientists have fired off criticism at the APOD website for unprofessional conduct, they themselves remain mystified as to the origin of the spectacle.

Allegations that the image - taken by 16 year-old Jonathan Burnett - was a hoax were thrown out when a second photo of the event surfaced. The new image had been taken at the same time by Julian Heywood, about 10 miles from the original location.

The best guess doing the rounds for the moment is that put forward by Steve Salter, an aircraft engineer in the UK, who has suggested that the 'fireball' may in fact be a contrail from the Concorde , whose flight path showed it in the vicinity at the time. As for the fiery look to the contrail, others also have put forward suggestions. Marco Langbroek of the Dutch Meteor Society says that the image could portray what's known as a "False Sun". This spectacle is created when light from the setting sun is refracted by ice particles within a high-altitude contrail.

... was den nu? *g*

Ich bin mal gespannt wie sich das hier weiter entwickelt
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Alt 15.10.2003, 18:42   #6
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Aber Leute es wird sich aufklären wie immer.Es war doch nur Wtterballon der sich entzündet hat.
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