Chances are nothing would happen as space is vast, but if it did get too close, it would be going way faster than anything around it, as it would be on a differ

Chances are nothing would happen as space is vast, but if it did get too close, it would be going way faster than anything around it, as it would be on a different plane. It would just scanner whatever is nearby like a big boat in a small pond. The heliosphere would look normal because there would be no drag on it. A comet has a tail because the sun is both melting and pushing material away from it. Lastly, we could probably heat our homes with the core of the planet for a little while, but everything would be dead within a few years. I think the Twilight Zone covered this scenario in an episode! In it the Earth started moving away from the sun for no good reason.