NASA also explains that as meltwater sloshes toward the equator, it will slow down Earth's spin. The animation by Insider zooms into a 3D Earth, and demonstrates how and when the cities will start ...

What if the moon and planets were closer to Earth? That's what Nick Holmes decided to find out. Holmes, AKA "yeti dynamics" on YouTube, animated these 3D models. He is an amateur astronomer and is ...