4.5 million miles may not seem very close, but that is the distance between a huge asteroid and Earth when it moves past the planet. It is 600 feet wide and known as 2021 KT1. Flying at speeds of above...

Most people are unaware of the Earth's second moon. It has recently made its way into Earth's orbit. Between Earth and the moon, this minimoon is actually a rocket booster from the 60s. Although it has...