How to Measure the Earth’s Radius With Legos

Make sure your angles are in units of radians (not degrees), where 2Ï€ radians = 360 degrees. But after that you will get the ...
Smithsonian Magazine

A Planet Slammed Into Earth 4.5 Billion Years Ago, Forming the Moon. The Projectile May Have Been Our Neighbor

Little is known about the long-destroyed moon-forming planet, Theia. But it may have been born in the inner solar system—just like Earth—a new study suggests ...