An asteroid that recently passed by Earth is about twice as large as originally estimated, and it would have had serious global consequences if it had impacted Earth. Asteroid 2012 LZ1 was only discovered on June 10, 2012 by Rob McNaught at the Siding Spring Observatory in Australia.
This Near Earth Object was thought to
be fairly large, 502 meters (1,650 feet) wide, and quite bright. But
astronomers using the planetary radar system at Arecibo Observatory were
able to better determine the asteroid’s size, rotation rate and shape
and found it to be about 1 kilometer (0.6 miles) wide and actually quite