What could lead to the appearance of a wormhole relatively close to our planet?

I was thinking of different ways a wormhole could appear relatively close to our planet but even reading much about wormholes I can't think of any possible conditions.

I need some theoretical or even better a more relatively scientific explanation (for a sci-fi), or conditions at which a wormhole could appear relatively close to our planet.

If anyone knows of a different body than a wormhole for space and time travel then please include that.

I need to somehow have a body like a wormhole appear in the solar system within reach. But this body should be able to do bad things to our planet and maybe the solar system itself. This body should allow time and space travel and have an entrance and an exit (which doesn't work vice versa).

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What could lead to the appearance of a wormhole relatively close to our planet?

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