Tim Sayell sends in a Yahoo News article that makes some startling conclusions - Earth at one point in its early history had more than one moon. The second moon was most likely very small and may have collided with its larger Luna companion. This would go a long way towards explaining why the Moon's surface is so different from one hemisphere to the next.
From the article:
The second moon ... would have been about 750 miles wide and could have formed from the same collision between the planet and a Mars-sized object that scientists suspect helped create the moon we see in the sky today
The Wikipedia has a great article dealing with the science of Earth having more than one moon here
picture from popsci
From the article:
The second moon ... would have been about 750 miles wide and could have formed from the same collision between the planet and a Mars-sized object that scientists suspect helped create the moon we see in the sky today
The Wikipedia has a great article dealing with the science of Earth having more than one moon here
picture from popsci
