A meteor crashing in Russia's Ural mountains has injured at least 500 people, as the shockwave blew out windows and rocked buildings.

Most of those hurt suffered minor cuts and bruises but some received head injuries, Russian officials report.

A fireball was seen streaking through the clear morning sky above the city of Yekaterinburg, followed by loud bangs.

President Vladimir Putin said he thanked God no big fragments had fallen in populated areas.

A large meteor fragment landed in a lake near Chebarkul, a town in the neighbouring Chelyabinsk region.

Much of the impact was felt in the city of Chelyabinsk, some 200km (125 miles) south of Yekaterinburg.

There are three factors which combine to create a meteor's starting speed
in the atmosphere. The minimum speed is around 11 kilometers per
second...this is due solely to the earth's gravity. A particle that has a
speed of zero relative to the earth, will be drawn in by gravity until it
is traveling just over 11kps when it reaches meteor height (~100km). The
second factor is the particle's motion around the sun, and can range up to
42 kps at the earth's orbital distance. Anything moving faster is not in
orbit around the sun, and is either passing through the solar system or has
been accelerated by interaction with a solar system object and is on it's
way out. These are VERY rare. Meteor shower particles must be in orbit,
since we pass them as our orbits intersect each year. Finally there is the
earth's motion around the sun..we are moving around 30 kps in our own
orbit, so we are adding our own motion to that of the particle around the
sun. So showers with slow speeds (< 30 kps) are catching up to us from
behind. Meanwhile, the fastest showers, such as the leonids, are moving at
high speed in a retrograde orbit (opposite that of the earth) and smash
into our windshield (the atmosphere) at the highest speed. (~72 kps). (BTW,
the theoretical fastest speed is not 72+30+11 kps, rather it is about 72.9
kps...the speeds are not added directly....it is the square root of the sum
of the squares....to explain it simply, a particle moving 72 kps has less
time to be accelerated and only reaches 73, whil a particle whose speed is
zero has lots of time to be accelrated by gravity so winds up at 11 kps)

Prije nego je pao na Zemlju, meteor je eksplodirao čak devet puta, citira Lifenews izvore iz Ministarstva za hitne situacije.

NASA će komentarisati i prenositi ovaj događaj, kako na tv-u tako i na internetu, više informacija :

http://science.nasa.gov/science-news/sc ... dcoverage/

ček ček,ja imam drugi link.
http://www.ustream.tv/nasajpl2