What happened 3.9 Billion years ago?
Was there a fith rocky planet until 3.9 Billion years ago? Mercury, Venus, Earth, Moon, Mars and Planet V? Explaining the large amount of Moon craters dating back that time? I wonder if it can also explain why the Moon's orbit is 5° away from an equatorial one, contrary to all the other moons in the solar system, except those like around Jupiter, Saturn and Neptune that were caught by the planet.
Raoul