Paleoclimate and archaeological evidence tells us that, 11,000-5,000 years ago, the ... variations in the Earth's orbit around the Sun that recur roughly every 20,000 years. Impressively, the ...

Fossilized teeth from two ancient megafauna suggest they roamed Brazil 3,500 years ago. The find “opens the door to rewrite South American history.” ...

have discovered that between 650 million and 280 million years ago, the Earth-Moon distance increased by approximately 20,000 km, and the length of a day extended by roughly 2.2 hours, the Science ...

During the past billion years, the Earth's climate has fluctuated between ... as the "Ice Age", was at its height approximately 20,000 years ago. Although the exact causes for ice ages, and ...