Space Today Online -- Solar System Planet Earth -- Ancient Astro A European researcher has interpreted carvings in a 32,500-year-old ivory tablet as a pattern of the same stars that we see in the sky today in the constellation Orion. The tablet is a sliver of ivory from the tusk of a mammoth — a large woolly animal like an elephant. Mammoths are extinct today.
Extrasolar Planets - Explore the Cosmos
The Twelfth Planet : Book I of the Earth Chronicles by Zecharia Sitchin; This is Sitchin's first book. By translating Sumerian texts he was able to come up with the history of aliens visiting our planet about 450,00 years ago. They came from a planet called Marduk or Nibiru which is on a huge eliptical orbit around our Sun. It takes about 3,600 years for one orbit. Some of them apparently jump over to our planet as theirs approaches then leave as it leaves this part of the solar system.