What would happen if a new planet appeared in our galaxy directly next to earth? What would be the consequences and impacts?

Answer from: Eugene Ch:

Since gravitational forces decrease inversely to the square of the distance, everything depends very much on where exactly it will appear and what its mass and speed will be. If you put it near Mars, the orbits of the planets will be unpredictably disturbed with all the chaos that ensues, and if somewhere in 100 astronomical units, then except for a possible comet rain in a very many years nothing should happen.

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