History of the Earth How it all began

History of the Earth

How it all began…

In what order do you think these important events in Earth’s history occurred? • • • Homo sapiens appeared (humans) The big bang Air breathing life appeared First life on Earth First galaxies formed Earliest dinosaurs appeared First human hunter gatherers Marine plant & animal life formed Globular clusters formed Solar system formed

If the events of Earth occurred in one year… • To comprehend this huge span of geologic time we will compress 15 billion years = 1 year • 1 sec is about 475 days

The Big Bang – January 1 st 15 billion years ago • All matter and energy in the universe were once condensed into a very small mass and a huge explosion sent matter flying out in all directions.

First Galaxies Formed – Feb. 9 13 Billion years ago

Globular Clusters Formed – March 14 12 Billion years ago

Solar System Formed – Sept. 13 4. 5 Billion years ago

First Life on Earth – Sept. 25 4 Billion years ago

Air-Breathing Life Appeared – Dec. 6 3. 5 Billion years ago

Marine Plant & Animal Life – Dec. 18 560 Million years ago

Earliest Dinosaurs Appeared – Dec. 25 248 million years ago

Homo Sapiens Appeared – Dec. 31 st (11: 53 PM) 200, 000 years ago

1 st Human Hunter-Gatherers –Dec. 31 st (11: 59 PM) 30, 000 years ago

• • • The big bang – 15 Billion – Jan 1 st First galaxies formed – 13 Billion – Feb. 9 Globular clusters formed – 12 Billion – Mar 14 Solar system formed – 4. 5 Billion - Sept. 13 First life on Earth – 4 Billion - Sept. 25 Air breathing life appeared – 3. 5 Billion – Dec. 6 • Marine plant & animal life – 560 million – Dec. 18 • Dinosaurs appeared – 248 million – Dec. 25 • Homo sapiens – 200, 000 yrs – Dec. 31 (11: 53 pm) • 1 st human hunters – 30, 000 yrs - Dec. 31 (11: 59 pm)