the side that can't be seen from the Earth. This video answers that question. The imagery was created using Lunar Reconnaissance Orbiter data. Video courtesy of Nasa Goddard Follow BI Video ...

Earth spins on a slight incline. 4.5 billion years ago, after colliding with the protoplanet Theia, the Earth's axis eventually settled into a 23.5 degree tilt. But what if Earth had flipped by 90 ...

The near side is what's visible to us. As the moon orbits the Earth, the sun lights up half of it, and that's when we see the ...