Earth and Moon Once Shared a Magnetic Shield | NASA

Four-and-a-half billion years ago, Earth’s surface was a menacing, hot mess. Long before the emergence of life, temperatures were scorching, and the air was toxic. Plus, as a mere toddler, the Sun bombarded our planet with violent outbursts of radiation called flares and coronal mass ejections. Streams of charged particles called the solar wind threatened our atmosphere. Our planet was, in short, uninhabitable… More about this in the link below…

“Earth and Moon Once Shared a Magnetic Shield | NASA” https://www.nasa.gov/feature/earth-and-moon-once-shared-a-magnetic-shield-protecting-their-atmospheres