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6. The implication is that solar systems are common, but the argument will be greatly strengthened if there is real agreement on how our solar system came about. national college iasi

12. On the other hand, the major premise, and certainly the most important, is to ascertain the existence of extrasolar planets by direct astronomical observations. national college iasi

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15. national college iasi The notion of planetary worlds orbiting stars other than our Sun is not new. Throughout history, beginning with the Greeks, humans have been pondering over the possibility of other solar systems beyond our own.

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18. http://www.nasa.govhttp://www.nasa.gov/ Diagrame with orbits from our solar system