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When arguing about science, there are many uncertainties. You must be able to prove your idea through well re-enforced facts and proof. Whenever a scientist comes up with a hypothesis they must be able to show how that came to his conclusion.

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The universe is so large, that there is bound to be life somewhere else. Using Keplers methods to find other planets we have discovered thousands of planets outside of our solar system. Scientists have to narrow down the planets they look at because it is impossible to look through all of them. Scientists try and find evidence of life such as affect on atmosphere and change of environment to detect life without having to go on the planet. Scientists are convinced that there will be other life, even if it is non-intelligent. Life has proven itself to be able to survive in the most deadly places.

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As planets get larger they affect their sun's orbit more. When a planet becomes about 13,000 times larger then that of the earth's. They start to move the star around. When looking for planets, astronomers have to start with looking for the planets stars as the planets are too dark to be seen from a telescope. The scientist find the color of the wave length to figure out how fast the star is moving to determine more about the planet. Depending on the tilt from the planets they are able to see a difference in the wave length from a planet going around the sun. If there is 0 movement from stars if nothing is pulling on them at all.

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Scientist have a vast array of tools that help them find planets, one of these is the use of measuring light of stars. When looking for planets, to be classified as one, they must revolve around a star. As a planet goes around a star for a brief period of time it ellipses, when it does so, the luminosity of the star goes down and then back up, showing waves on scientists luminosity measures. If looking at a star, the stars luminosity stays the same for a very large period of time, it can be assumed that there are o planets present.

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When looking for planets that may host life, or be able to host Human life in the future. Scientist must look at planets that revolve stars that have a specific heat size and luminosity. When a star is too hot, it will evaporate the water on the surface, when it is too cold, the water will freeze and life will be unsustainable. Finding the goldelox zone for stars is imperative to finding an exo planet.

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In another attempt to search for life, scientist will reduce their range of possible planets that could host life. They do this by measuring the atmosphere of what it contains, they use the color spectrum to see how the light will reflect off of the planets atmosphere, using something called spectroscopy. By seeing how large the color spectrum is, the scientist can see what the main element present is.