How would Baseball be different if it were played in space instead of earth
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Answer:
Only if you threw it in exactly the right way. If you threw it mostly normal or antinormal, it could return after one orbit. The exact vector would require math, but the idea is to keep the orbital period 90 minutes exactly, but only change the inclination. In fact, one could have it return 45 minutes later if one was careful. But if one throws it in any direction but the perfect vector, it will not return to the same spot. If one throws it in the direction of motion, it will speed up and go further out, causing the orbital period to lengthen. It would be at the same spot later then the station. Throwing the opposite direction will cause it to slow down, lowering it's orbital period, and the ball will arrive first at the spot. Throw it radial or anti-radial will also change the orbital period slightly. Only at one of the perfect directions could the ball actually return, and the perfect angle is likely dependent on the velocity.
As an experiment, try launching a "ball" in to space with Kerbal Space Program, with objects facing many different directions. Have them deploy all at the same time, and see if any of the objects closely approach the original object after an orbit. Some of them should return close, but most of them will go far away.