Earth facts

It is a 4,550,000,000-year-old, 5,973,600,000,000,000,000,000-tonne ball of iron.

A new study finds:

According to the new figures, the Earth weighs 5.972 sextillion -- that’s 5,972 followed by 18 zeroes -- metric tons. Previous estimates put the globe’s mass at 5.98 sextillion metric tons.