What if an 'unknown planet' passed right by Earth? The terror of gravity, which changes the world even without a collision

A planet with the same mass as Earth approaches near the Moon's orbit.If such an event were to occur, what would happen to ...
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What if every planet in the solar system could support life?

Make room, earthling. We’re moving the other planets in our Solar System into our planetary neck of the woods. Would all the planets fit into this Goldilocks zone? What kinds of gravitational chaos ...
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What if Jupiter swallowed every other planet in the solar system?

You start your day hearing wild news. Jupiter has just swallowed Saturn. And it doesn’t stop there. Jupiter is on its way to ...