theoretically if an alien from another exoplanet with a much stronger gravity from ours comes here could that alien be able to levitate/fly on Earth?
In: Physics
No.
It is not different from when humans visited the moon with 1/6 the gravity of earth,. Humans on the moon could jump higher and carry more mass than down here on earth but not fly or levitate. The astronauts were limited by stiff and heavy spacesuits.
As long as there is any gravity to fly or levitate you need to be able to apply a fore to counteract it. So you need wings or something similar to create a downward force. So at best, the aliens would be able to jump very high and very far but not fly.
There might be an exception and that is if you could jump so you reach escape velocity. You would then be able to jump and orbit the sun or the object you jumped from orbited. I would not call that flying or levitation. Humans could do that too on a small enough object like a comet.
From earth, you need to jump at above 11.2km/s, the problem if you could is to survive the forces from the air and not be evaporated by the generated heat.
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