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The object is thought to have plunged into Lake Chebarkul in central Russia leaving a 6m-wide hole in the ice.
If confirmed, it would be the largest fragment of the meteorite yet found.
More than 1,000 people were injured when a 17m, 10,000-tonne space rock burned up over Russia on 15 February.
Live footage showed a team pull out a 1.5-metre-long (five-foot-long) rock from the lake after first wrapping it in a special covering and placing it on a metal sheet while it was still underwater.
The boulder was then pulled ashore and placed on top of a scale for weighing, an operation that quickly went wrong.
The rock broke up into at least three large pieces as it was lifted from the ground with the help of levers and ropes.
Then the scale itself broke, the moment it hit the 570kg (1,255lb) mark.
But scientists cautioned that it would take time before they could verify that the rock pulled from the lake had indeed come from space.
reply to post by j.r.c.b.
Firstly, how have you not heard of this before? it was all over the news and web! looks like your son is well clued in
Astronomers have the resources these days to spot almost all the kilometer-size near-Earth asteroids that could wipe us out, its the smaller ones that are tricky to spot, but after the Russian meteorite our governments are more aware than ever.
What else can we do, we sit in a cosmic shooting gallery.