> NASA closely watches Asteroid 4660 Nereus because its size. Asteroid 4660 Nereus is well over 492 feet long and will come within 4.6 million miles of Earth.

> NASA closely watches Asteroid 4660 Nereus because its size. Asteroid 4660 Nereus is well over 492 feet long and will come within 4.6 million miles of Earth. There is a much bigger rock that's much closer to Earth. https://en.wikipedia.org/wiki/Moon https://en.wikipedia.org/wiki/Moon