View Full Version : Canadian Meteor Update: 10-Ton Rock Responsible

2008-Nov-26, 02:30 PM
The search is on for fragments of a 10-ton rock that lit the sky over western Canada last Thursday evening. Scientists estimate that at the time it hit Earth's atmosphere, the asteroid fragment weighed approximately 10 tons and was probably about the size of a desk. It exploded with the force of 300 [...]

More... (http://www.universetoday.com/2008/11/26/canadian-meteor-update-10-ton-rock-responsible/)

2008-Nov-26, 11:42 PM
What causes a meteor to explode as it enters the atmosphere? Is it entrained ice that turns to steam and produces a steam explosion?

2008-Nov-27, 12:32 AM
If exploded into many fragments the meterite hunters are starting [Canadian]
to gather them which just happen to be hunters thats familiar with the area.

If allowed by law and a good thing.

Tax officials will take their cut.

I would declare it as a possible tax capital gain, when sold.

Which simply would increase interest as the Tax vultures are only intersted in cash future sale makes the price go up so not actually losing anything.

And can always use it for barter.

No tax problems there.

One can only imagine a barter for a meteroite fragment for what.

If not a hunter and not familiar to the area it might just look like a moose track as might have penertrated 3 feet beneath the soil.

With a few months, the vegetation would grow over the impact sites, so as thousand metal detectors can't search a area that size if not on a trail.

Tim Thompson
2008-Nov-27, 03:23 AM
What causes a meteor to explode as it enters the atmosphere?
As the meteor enters the atmosphere friction not only superheats the meteoroid surface, but also seriously stresses the meteoroid so that it changes shape. That stress causes micro- (and macro-) cracks that "spider-web" throughout the rock, and it consequently explodes as the atmosphere is rammed through the cracks at high speed.

2008-Nov-27, 03:54 PM
Hey guys, I wonder... How often do rocks that size hit the planet?

2008-Nov-27, 04:20 PM
Actually hit, probably not that often. For a 10 ton fragment to make it to ground, it would have to come from a much larger body. But I had read that fireballs from similar sized meteors occur rather often, weekly, somewhere around the planet. Most of the time they're over ocean, obviously, and those over populated areas just aren't seen, maybe because of the time they're more likely to occur (early AM).

2008-Nov-27, 05:05 PM
Hey guys, I wonder... How often do rocks that size hit the planet?

If hitting includes burnng up in the atmosphere, often.

I checked Google News for fireball meteor to see if the Edmonton event was the most recent in print. Nope. There was at least one since; I didn't look further.

Prince George Citizen: Meteor brightens northern B.C. sky (http://www.princegeorgecitizen.com/20081126163265/local/news/meteor-brightens-northern-b.c.-sky.html) (Wednesday, November 26)

It's interesting the meteor came on the heels of the big meteor that brightened the skies over Alberta and Saskatchewan last week. "This one must have been fairly big to be visible this far north," he said.
"It's fairly rare to see a fireball like that," Nash said. "Meteors are common, but fireballs are not. It means this was something fairly big."

Maybe it wasn't quite as large or as newsworthy. But Earth is a big planet and there's lots of small harmless bits floating about, so there are frequent encounters.

Edit: for instance, Meteorite Falls and Finds, Some Statistics (http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?letter=.&classic=YES&bibcode=1981Metic..16..269H&page=&type=SCREEN_VIEW&data_type=PDF_HIGH&send=GET&filetype=.pdf) (PDF) by David W Hughes, reports a formula that would predict 5000 meteorites in the British Isles in 200 years, about 25 per year, 2 per month. That's meteorites, meteors reaching the ground, something not yet determined to have happened for the Edmonton meteor. The paper is full of charts and equations and tables and histograms for rates and types... with circles and arrows and a paragraph on the back of each one explaining what each one was.

2008-Nov-28, 09:56 AM
(Alice's Restaurant)

2008-Dec-04, 08:06 AM
(Alice's Restaurant)

(Very good.)

Latest meteor in the news: 3News New Zealand: Meteor burns up over Auckland (http://www.3news.co.nz/ScienceTech/Story/tabid/412/articleID/82891/cat/73/Default.aspx)

Star spotters were served up a treat in the skies over Auckland last evening. The tail of a meteor was seen for several minutes just after sunset.

Astronomers say meteors are a rare treat, and even rarer is managing to catch one on camera.
One of the possibilities is it could be is a meteor from outer space. When they fall into the Earth's atmosphere they start to burn up. Meteors hit the Earth's atmosphere every day, but bigger ones like last night's are only spotted about once a day anywhere in the world.