Planet Earth, which we humans and all currently-known forms of life
call home, is the third planet from the Sun, and the largest of the
terrestrial planets. With a mean radius of 6,371 km (3,958.8 miles), it
is slightly larger than Venus (which has a radius of approx. 6,050 km), almost twice the size of Mars (~3,390 km), and almost three times the size of Mercury (~2,440 km).
Basically, Earth is a pretty big world. But just how big if one were
to measure it from end to end? If one were to just start walking, how
many kilometers (and/or miles) would they have to go before they got
back to where they started. Well, the short answer is just over 40,075
km (or just over 24,901 miles). But as always, things get a little more
complicated when you look closer.
<span />
