One asteroid's diameter was between 5 and 8 kilometers (3-5 miles) and created the Popigai crater in Siberia, a depression 100 kilometers (60 miles) across. Another asteroid 3 to 5 kilometers (2-3 ...

That impact left a 60-mile-wide crater - known today as the Popigai crater - in northern Siberia. These two asteroid strikes formed the fourth and fifth largest known craters on Earth, and yet ...