The origin and evolution of the Solar SystemVideo | Updated 3 years ago Alex Bevan, Head of Department of Earth and Planetary Sciences How were the planets constructed? What were the original building blocks? Alex Bevan tackles these enduring questions by unlocking the clues found in meteorites. Journey through space and time to the beginning of the Solar System, 4.56 billion years ago. Chevron are a presenting partner for the "In the Wild West" lecture series. View the discussion thread.