Skip to main content

When Meteors Explode: Full Account of a Wild Chicago Night

space.com: "It hit the atmosphere at about 40,000 mph,' Simon said. 'At this great speed, air pressure builds up in front of the object and is much greater than the pressure behind it. This will pull apart many meteors, especially if they already had some cracks. This object probably went though four fragmentation events as it passed through the atmosphere.'

Tremendous heat created by the pressure lit much of the object in a fiery display.

Park Forest resident Noe Garza was asleep when a fragment burst through his ceiling, sliced some window blinds, then bounced across the room and broke a mirror. 'I thought somebody was breaking in,' Garza told a new agency the next day. 'It was a big bang. I can't really describe it.'

Another resident whose home was hit said the room lit up and it sounded like a plane had crashed.

Simon's team examined hundreds of fragments -- 65 pounds worth that were picked up and delivered to the scientists -- to estimate the original rock's size and weight.

The measurements are difficult to pin down, he explained, because a lot of fragments probably hit wooded areas and were not found. And some of the original meteor was probably broken into particles too small to notice. The scientists also analyzed the fragments for a certain radioactive form of cobalt, which can reveal the rock's minimum size. 'If the object is too small [while in space for eons] the cosmic rays will just pass through and not make 60 cobalt,' Simon said.

He said the original rock weighed at least 1,980 pounds as it entered the atmosphere. Long ago, the analysis shows, it was probably heated for a long period of time inside a larger parent asteroid. That asteroid then broke apart, again a long time ago, perhaps in a collision with another asteroid."

Comments

Popular posts from this blog

Artist turns animals into everyday objects

Ananova - A Chilean artist is making a name for herself with an exhibition in which stuffed animals are transformed into household objects. Artworks on display include a chick turned into a lamp, and 'sheep bag' - a lamb carcass fitted with handles. Artist Caterina Purdy says her exhibition at the Experimental Arts Centre in Santiago is intended to be humorous but also makes a serious point. She told Las Ultimas Noticias online: 'It is possible to see my work as something scary, but I find it beautiful. 'There is also irony and humour in my objects as well as a criticism of the way animals are treated by society.'"

Josh Nimoy @ ITP - BallDroppings

Josh Nimoy @ ITP - BallDroppings : "BallDroppings is an addicting and noisy play-toy. It can also be seen as an emergence game. My brother Marc takes this software seriously as an audio-visual performance instrument. Balls fall from the top of the screen and bounce off the lines you are drawing with the mouse. The balls make a percussive and melodic sound, whose pitch depends on how fast the ball is moving when it hits the line."

W Ketchup™

W Ketchup™ : "You don’t support Democrats. Why should your ketchup? W Ketchup™ is made in America, from ingredients grown in the USA. In side-by-side taste tests of five leading brands, we found that W Ketchup is second to none. You'll never go back to Heinz again! W Ketchup is America’s Ketchup™"