550 million years ago, the Earth's magnetic field plunged by 90%
Mars, which is at its closest 55 million kilometers from Earth, has long been considered by astronomers to be the best place for human colonization in the solar system because it has almost no atmosphere and is easier to land on than Venus. But Mars wasn't born the way it is today. During the first …
550 million years ago, the Earth's magnetic field plunged by 90% Read More »