The asteroid, named 2012 BX34, measured between six and 19 meters in diameter (20 to 62 feet), said Gareth Williams, associate director of the US-based Minor Planet Center which tracks space objects.

Did a collision with a giant asteroid or comet change the shape of ... 30 times greater than average in the Cretaceous/Tertiary (KT) boundary, the layer of sedimentary rock laid down at the ...

Astronomers around the world aimed their telescopes to catch a glimpse of the 2005 YU55 asteroid, which is about as big as an aircraft carrier but was not visible to the naked eye when it passed ...