Well all the planets are constantly moving around the Sun, so they get closer and further away from each other at different times of the year. The gravitational pull of the Sun is what determine show planets move, and the Sun is getting lighter by about 4 million tonnes per second – that is the mass lost as the Sun’s nuclear core burns Hydrogen and makes Helium.
So if the Sun is getting lighter, it’s gravity is getting weaker, so th eplanets are slowly drifting further away from it, and so probably getting a bit further apart – so I’m not sure where you saw something about them getting closer?
There are asteroids and comets that can come close to (and even hit) the planets – maybe it was that?
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