Look at Saturn and it is difficult not to wonder what Earth would look like with rings. A vast band of ice and rock stretching across the sky. A permanent feature visible from the surface. Shadows moving across the planet as the ring system changed with the seasons. It sounds like science fiction. But Earth may actually have had something resembling a ring system in its distant past. Not necessarily a beautiful, permanent structure like Saturn's — but a temporary ring of debris could have formed around our planet after a massive collision. And the most intriguing possibility is that such an event may have played a role in creating the Moon. Earth wasn't always the quiet planet we know today The young Solar System was a chaotic place. Planets were still forming. Asteroids and planetary embryos were moving through unstable orbits, occasionally crossing paths. Collisions were not unusual. Some were relatively small. Others were catastrophic. The leading explanation for the Moon...
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