The Earth

The book I read to research this post was The Earth A Very Short Introduction by Martin Redfern which is an excellent book which I bought from kindle. This book is of particular to anyone studying anything like geology, astronomy or earth sciences. A lot of geologists are looking at other planets and stars to see what processes originally created the Earth. It's thought there have been many impacts by comets and meteors in the past although mostly in the early history of the Earth. Many bigger comet impacts bigger than the one that probably wiped out most of the dinosaurs. The seas and rivers were probably formed from the ice in these comets. In the earliest history the Earth didn't have an atmosphere that would protect it from most impacts. The Ozone layer which repels most radiation is only 3 millimetres thick hence you can see why it is so fragile and susceptible to attack from the chemicals in aerosols. If you are studying something like rock formation you have to study all the Earth's cycles not just the geological ones either. One thing astronomers want to do is put at least 4 or 5 infra red telescopes in space which would be as Jupiter to avoid the infra red radiation of Earth. These telescopes would be several times the size of Hubble and would look for planets like Earth in other solar systems. A minimum of 4-5 telescopes would be needed to triangulate the location of these planets. They would look for the free oxygen signature on these planets and we know for oxygen to be stable on a planet there must be cycles similiar to Earth's and life.