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39.48, -82.98 | An expanding universe, along with relative motion, is what keeps things apart...for the most part. Everything that's on a collision course has mostly collided already.
Stop all motion for an instant and gravity will begin pulling mass toward mass everywhere. Our moon would fall toward Earth, as we plunge into our sun...which, in turn, would begin its slow descent toward the massive black hole at the center of our galaxy.
Of course, by the time our sun reached where that black hole was, it will have moved...drawn toward the center of mass for our local group of galaxies. Likewise, other bodies will miss each other as the whole system of motion gets restarted. But you could count on a lot of fireworks for a few million years. | |
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Is the sun stationary or does it move around?
