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biology-life on mars?

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Introduction

The idea that life begun on mars and travelled to earth is sometimes called panspermia. Here is the definition: Panspermia is a hypothesis that the seeds of life are prevalent throughout the Universe, and furthermore that life on Earth began by such seeds landing on Earth and propagating. The idea has its origins in the writings of Anaxagoras, but was first proposed in its modern form by Hermann von Helmholtz in 1879. Panspermia can be said to be either interstellar (between star systems) or interplanetary (between planets in the same solar system) There is as yet no compelling evidence to support or contradict it, although the majority view holds that panspermia - especially in its interstellar form - is unlikely given the challenges of survival and transport in space. For * "It's surprisingly easy to get material from Mars to Earth," says Gladman. "If you launch stuff off Mars, there aren't a lot of other places to go." He found that up to 5 percent of the rocks launched from Mars land on Earth within 10 million years. ...read more.

Middle

The hottest deserts and deepest ocean are all home to amazing weird and wondrous animals plants, and organisms that the idea of life on mars suddenly is not just nonsense * Due to the ever-cooling solar say piece of rock from Mars, which landed on Earth when a meteor hit Mars and scattered its rocks, contains signs of life. Small fossils and evidence of a basic once-living micro-organism provided the strongest proof yet that life did once exist on Mars billions of years ago universe it has been said that mars would have had a higher temperature, this would have made conditions more suitable for life. * A piece of rock from Mars, which landed on Earth when a meteor hit Mars and scattered its rocks, contains signs of life. Small fossils and evidence of a basic once-living micro-organism provided the strongest proof yet that life did once exist on Mars billions of years ago Against * Mars is made up of mainly Carbon Dioxide. 95.32% compared to a tiny amount of 0.037% that the earth has in its atmosphere. ...read more.

Conclusion

The ice in its ice-caps is frozen Carbon Dioxide (also known as 'Dry Ice'). Water is one of the most important elements for life to exist. * Mars is known as a "self-sterilising" planet. Its surface is saturated by ultra-violet radiation by the Sun. Ultra-violet rays are what can cause skin cancer on Earth although, fortunately, the Earth's atmosphere filters out most of these dangerous rays. The soil is extremely dry on Mars because of the lack of water, and this soil also undergoes an oxidising process, which is what causes the soil to rust (it forms a metal oxide) and appear rusty-coloured. This self-sterilisation of Mars prevents micro-organisms (small and basic but living objects) from forming on or under the surface * If one of the main forms of evidence that shows there is/was once life on mars the ways that it got to earth could have been just as easily an earth rock that went to mars thousands of years ago and then eventually retuned back to earth. Although most scientists agree that the gases trapped in the rock are the same as those present on the atmosphere no still does not prove that life existed on mars. ?? ?? ?? ?? Sarah Mills 10G ...read more.

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