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What speed must you travel in order to get to mars in order to get there in four years?
It depends. Because the distance between the Earth and the mars varies, the speed will also change if the time is given.If the mars is in perihelion and the earth in aphehelion, then you will have to go at speed of 1558.21917808 km/hr. But if the earth is in perihelion and the mars in aphehelion, then you will need a speed of 2916.66666666666........ km/hr in order to reach the moon in 4 years.
What's the perihelion distance of Mars?
The difference between the earth's closest approach to its star and its furthest distance away from it depends on how "out of round" or how eccentric is the earth's orbit around the Sun. Simplistically, this eccentricity varies periodically with a period of about 100 thousand years from 0.005 (almost perfectly circular) to about 0.058. The present eccentricity is 0.017 which yields a perihelion of about 91.405 million miles and an apelion of about 94.512 million miles. This varies from year to year.
