Tom Cravens Origins web site
This web site is about Origins. It is designed to enable the user to
explore web sites which will provide information about our current
scientific understanding about the origins of the universe, our solar
system, our planet, life, our species and our culture.
Current evidence indicates that our universe began
13.7 Billion years ago with a "Big Bang".
Click here to find out about the Big Bang
We think that the First Stars formed between
200 and 400 Million years after the Big Bang.
Click here to find out about the First Stars
Click HERE To See The size of the Universe
The life span of a star is inversely proportional to it's mass.
Massive stars have short lives and small stars have long lives.
Some stars end their lives with a massive explosion called a
Super nova.
Click here to find out about Super nova
Our Sun and it's solar system including our earth came
into existence about 4 1/2 Billion years ago.
Click Here to see the Birth of the Solar System
Click here to view the evolution of our Solar System
Life on earth came into existence approximately
4 Billion years ago.
Click here to find out about the evolution of life
Click here to see Origin and Evolution of Life
Mammals appeared on earth about 200 Million years ago
Modern humans appeared in Africa about 100,000 years ago.
Click here to find our about Human evolution
Date of Last change 5-3-11