"Gunner" wrote in message
...
On Wed, 27 Feb 2013 20:03:55 -0600, Ignoramus15027
wrote:

http://www.cnn.com/2013/02/27/world/...eor/?hpt=hp_t2

Margaret Campbell-Brown, an astronomer at Canada's University of
Western Ontario, says that the Russian meteor was "56 feet (17
meters)
across, weighed more than 700,000 tons and was moving about 18
kilometers per second (40,000 mph) when it blew apart, she said."

What her saying implies is that, if the meteor was a cube 17x17x17
meters, which is the largest object of 17 meters in size, then its
density was 142 tons per cubic meter.

For comparison, gold is only 20 tons per cubic meter.


I just read an estimate that works out to density of around 4,
assuming it's a 17m sphere which is ~half (pi/6) the volume of a 17m
cube. That suggests it is either a mix of rock and iron, or titanium.
jsw