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Planets don't have elliptical orbits any more than they have circular ones. Elliptical orbits are more useful tools for thinking about their orbits, not ultimate truth.

So are astronauts in the ISS’s circular orbit, so would they if they were in an elliptical orbit.

So only if they are in fairly circular orbits can they keep orbiting the magnet for a long time. Similarly one reason that the planets have fairly circular orbits is so that they dont crash into each other.

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