Lots of these things could add up to the extra unknown gravity source.
“Lots of these things could add up to the extra unknown gravity source.”
That is what they are implying. But the Sumerians could not be wrong... :)
Maybe if we could “gently” crash a few of these large icy asteroids into Mars, increase its gravitational field, create a nice ocean and atmosphere, we’d be well on our way to some useful terraforming!