How could a creature move through space realistically without any additional technology?

I would like to have a space whale type creature that can fly through space. It would be very large and fly from planet to planet using orbital maneuvers. I want this creature to be able to do it naturally as if the species evolved in space as apposed to on a planet. I imagine wings wouldn't work as there is no air to push against. The only thing I can think of is it spitting in one direction to propel it in the other but I don't love that idea.

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How could a creature move through space realistically without any additional technology?

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