Just pause for a moment...
and imagine what violence it would take to strip the mantel Lithosphere and Asthenosphere from the iron core of a Mars size planet? It boggles the mind!
To add to that, it would have to have been an older planet, because most planets in the solar system developing during this period would have been massive balls of lava. The only reason Earth is late in cooling off, is supposedly because of the Earth Moon collision around 4.5 billion years ago.