Also the second largest impact structure on Earth, the 1.85 billion years old Sudbury crater in Canada, hosts world-class mineral deposits - in this case nickel-rich minerals that were melted and concentrated by the extreme heating caused by the impact.
The circumference of Earth at the equator is about 24,902 miles (40,075 km), but from pole-to-pole â the meridional circumference â Earth is only 24,860 miles (40,008 km) around. This shape, caused by the flattening at the poles, is called an oblate spheroid.
The observable universe is approximately 90 billion light years in diameter and the Earth is approximately 12000km in diameter. Let's assume that a grain of sand is 0.5mm in diameter. If we shrink the Earth down to the size of that grain of sand it would become 1/24000000000 (one 24 billionth) its original size. The observable universe, shrunk down by the same factor, would become 3.75 light years in diameter.