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Meteorite crash in Russia

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Re: Meteorite crash in Russia

#111
post #37

Earlier quoted context omitted.

Two more good videos (high quality, trail/train detail, booms, etc): http://www.youtube.com/watch?v=XDqYclzto7k http://www.youtube.com/watch?v=0ozSq3yEm3g

Why do you suppose there would be two contrails?

I wouldn't think they are contrails. One would expect them to mainly be smoke and dust from the disintegration/combustion/ablation during the descent.

Re: Meteorite crash in Russia

#112
post #84

Do meteorites really do this? I've never heard of another like this event before, and I always hear reports about meteors 'almost' hitting earth well in advance of the possible collision date. I didn't think the sky could simply open up and rain down hellfire without anybody spotting it beforehand.

> Do meteorites really do this? I've never heard of another like this event before ...

In that case, it's time for you to read about Tunguska in 1908:

http://en.wikipedia.org/wiki/Tunguska_event

Re: Meteorite crash in Russia

#113

I suspect the meteorite and earthquake are not related. The only recent earthquake that fits your description was M6.6 at 67.580°N 142.593°E [1], that's about ~2630 miles away from the reported meteorite impact in Chelyabinsk, Russia [2]. [1] http://earthquake.usgs.gov/earthquakes/eventpage/usc000f76f#... [2] http://hosted.ap.org/dynamic/stories/E/EU_RUSSIA_METEORITE?S...

> I suspect the meteorite and earthquake are not related.

It wasn't an earthquake -- it was a very powerful sonic boom, and yes, it was caused by the meteorite's passing. A similar sonic boom flattened hundreds of square miles in Tunguska in 1908, after a much larger space object fell there:

http://en.wikipedia.org/wiki/Tunguska_event

Re: Meteorite crash in Russia

#114

Earlier quoted context omitted.

Great video except for the Vertical Video Syndrome [1]. Is that glass breaking right after the shockwave? I wonder what kind of overpressure it generated. eta: ghshephard posted a link to a better video with the clear sound of glass breaking. https://news.ycombinator.com/item?id=5224858 [1] http://www.youtube.com/watch?v=Bt9zSfinwFA

Maybe the sound that we heard traveled faster than the acoustic waves that broke the glass due to having different frequencies.

> Maybe the sound that we heard traveled faster than the acoustic waves that broke the glass due to having different frequencies.

Unlikely. A powerful sonic boom could cause all that damage, and collapse an aging brick structure, and yet travel at or near the speed of sound.

Re: Meteorite crash in Russia

#115
post #45

I don't get why everyone seems to be running out of (what appear to be) fairly sturdy concrete buildings and into the street. Sure, a building won't protect you from an incoming meteorite of any size, but being indoors might protect from fragments if an incoming meteor hits something else.

Why not run outside? I haven't heard anyone killed by meteorites, so I wouldn't consider them very threatening. If it's not threatening then why not go out and enjoy the show?

Re: Meteorite crash in Russia

#116
post #45

I don't get why everyone seems to be running out of (what appear to be) fairly sturdy concrete buildings and into the street. Sure, a building won't protect you from an incoming meteorite of any size, but being indoors might protect from fragments if an incoming meteor hits something else.

> I don't get why everyone seems to be running out of (what appear to be) fairly sturdy concrete buildings and into the street.

Well, since one brick structure collapsed, and since one's immediate impression was that it was an earthquake, running out into the street seem perfectly reasonable. The fact that it was a powerful sonic boom, not an earthquake, would be something I might figure out at my leisure only after running outside.

Re: Meteorite crash in Russia

#117

Here's a collection of insane videos of the event, some with the enormous sonic boom: http://www.youtube.com/watch?v=XIAm5hq8WWc http://www.youtube.com/watch?v=b0cRHsApzt8 http://www.youtube.com/watch?v=Np_mpGYSBSA Can anyone translate what they are saying in the first one? You can get a good idea of the new videos being posted using YouTube's "last hour" filter: http://www.youtube.com/results?search_query=%D0%BC%D0%…

Here's a great dashcam video that captures the meteor arcing across its field of vision and lighting up the scene more brightly than the sun like a nuclear blast (first submitted to HN by dennisgorelik). I almost thought it was a hoax, and even tried to examine the video for signs that it was CGI. http://www.youtube.com/watch?v=tJOJ6B2XOyA The guy doesn't even say anything for a long while, just starts speeding up. e…

Why does the timestamp on the video say December 31st 2012?

Re: Meteorite crash in Russia

#118
post #10

Earlier quoted context omitted.

Does everyone in Russia have a dashcam or something? It seems like every other video I see on YouTube was recorded on one, and yet I don't know of anyone in Japan or the US with one installed (parking cams don't count). It's a great idea– I would probably get one if I still had a car, but it's amazing to me just how prevalent they seem in Russia. (Elsewhere too? I don't know. I'd love it if someone could enlighten me…

It's a byproduct of Russians using them to combat corruption and scammers on the road. It's a fad that caught on based upon the underlying need. In the US most citizens don't have that underlying need. The cops, on the other hand, do have burden of proof and liability concerns, so police cars do have them. If the average citizen could be extorted on the highway they'd start to catch on here too :)

> If the average citizen could be extorted on the highway they'd start to catch on here too :)

Actually, after having driven tens of thousands of miles on the interstates a number of years ago I think they would be a tremendous improvement on rest stop safety at the very least. That may be better served by an omnidirectional parking cam (and it would have to be running all the time, or you would need to flip it on), but I don't think it's a bad trend. It's certainly more appropriate than asking the state to manage/install even more surveillance nodes...

Edit: by 'it' I meant recording devices in vehicles, put there by the vehicle owner.

Re: Meteorite crash in Russia

#119
post #117

Earlier quoted context omitted.

Here's a great dashcam video that captures the meteor arcing across its field of vision and lighting up the scene more brightly than the sun like a nuclear blast (first submitted to HN by dennisgorelik). I almost thought it was a hoax, and even tried to examine the video for signs that it was CGI. http://www.youtube.com/watch?v=tJOJ6B2XOyA The guy doesn't even say anything for a long while, just starts speeding up. e…

Why does the timestamp on the video say December 31st 2012?

I have also seen videos of this event dated by January 1970. The explanation is silly: most of the drivers don't care to set the correct date on their dashcams.

Re: Meteorite crash in Russia

#120
post #84

Do meteorites really do this? I've never heard of another like this event before, and I always hear reports about meteors 'almost' hitting earth well in advance of the possible collision date. I didn't think the sky could simply open up and rain down hellfire without anybody spotting it beforehand.

Sure. There was one like this in the US in the early 1990s - the Peekskill fireball. There was also the Great Daylight 1972 Fireball, where the meteor entered and then exited the atmosphere.

The Peekskill meteorite was estimated to be 26 pounds and 1 ft across before it entered the atmosphere. Spotting something like that in space is hard.

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