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A Danish astronomer made the actual calculation that where mars is in 1500?s. Galileo Galilei was the first person to see mars with a telescope 1609. Mars is a fourth planet from the sun and it rotates around the sun in earth' 687 days and rotates around it?s axis in 24 hours and 40 minutes. Mars is about ? of the earth's size and 1/10 the mass. There has been many ships to mars in last 40 years.
Many countries have sent spaceships to mars to study the planet. Two-third failed and some spaceships was able to complete their mission. Part of this high failure rate can be ascribed to technical problems, but enough have either failed or lost communications for no apparent reason that some researchers half-jokingly speak of an Earth- Mars " Bermuda Triangle" , or a mars curse 2...
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