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Origin Of life Questions on the origins of things have always fascinated scientists The origin of the universe is the greatest cosmological question with different scientists who all have their own theories and beliefs In our part of the universe the question of the origin of our galaxy still fosters debate among scientists Perhaps the most relevant origin question to the human race is that of the origin of life itself To the joy of scientists it is relatively easy to experiment in this area and there are many plausible explanations 2 Scientists believe that the earth began 46 billion years ago 5 It is thought that our Earth began as cold world 6 Soon after probably because of a very substantial meteorite impact 7 the planet heated up enough to melt and become divided into layers by density It is thought that the very first atmosphere may have been hydrogen gas but hydrogen is a very lightweight gas and is very reactive most of it would have floated off or reacted This hydrogen atmosphere would not have lasted long 6 One of the theories of how life on earth originated is based on the ideas of Alexander Oparin a Russian scientist Mr Oparin wrote a hypothesis in which he described conditions that he felt would have been necessary for life to first come into existence on Earth He theorized that the first atmosphere of earth was made of water vapor H2O carbon dioxide CO2 carbon monoxide CO nitrogen N2 methane CH4 and ammonia NH3 6 This atmosphere is often referred to as a Jovian atmosphere so called because of the relationship the primitive atmospheres of the present day outer planets 1 As the surface of Earth cooled again huge rains created the first seas It is believed that Venus has an atmosphere very similar to the one described by Oparin 6 Lightening ultraviolet radiation and volcanic action all were more
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