by 
Shikimaru
ANSWERS: 1
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Without the sun the planets (including earth) would have nothing to orbit. We would then fly off into the coldest parts of space - temperatures would be so low that nothing would be able to live on the earth (more on life in second). Theory suggests that it was the suns gravitational force that pulled together debris flying through the cosmos and formed the planets to begin with...i.e. if the sun never existed nor would Earth. I can see this is listed in Biology so will now be a little more relevant. The heat from the sun hits the Earth and is then trapped (greenhouse effect). This allows the temperature on Earth to be higher than that of the space surrounding it (ie space). The temperature on Earth is right to sustain life (obviously). Without the sun the temperature would plummit too low to continue supporting life. If there was no sun then Photosynthesis could not happen. Without Photosynthesis plants would die...Plants make oxygen (through photsynthesis)...so without plants life as we know it would end on Earth.
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