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The heliosphere starts right here (or, you might say, at the Sun). Sedna is much further out.

However, the heliosphere extends far out beyond Pluto. So the outer boundary of the heliosphere can be beyond Sedna.

Sedna has an orbit that is very "eccentric" (highly elliptical). It's distance from the Sun varies greatly as it orbits.

So, whether Sedna is inside or outside of the heliosphere changes with time.

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