This would explain a lot.
explaining their own theory: that instead of burning up, smaller and less dense exoplanets may become involved in horrifying interplanetary collisions that destroy them as individuals and reassemble them into larger bodies., this new theory is based on the understanding that as the smaller rocky planets drift closer to their stars, their orbits become more unstable and put them on a potential collision course with one another.
According to the Rice researchers' simulations, two rocky planets smashing together would increase their total mass, but because they would lose gas layers in doing so, it would also decrease their radii and cause them to form a single, more massive planet., but because "their size does not change that much because water is less dense," those types of collided planets would still "stay above the radius valley.
All said, it certainly seems plausible that out in the great beyond, planets are smashing into each other and creating single, bigger planets — or at least, as plausible as any of the
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