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When Earth and Mars are furthest apart. On the opposite end of the scale, Mars and Earth can be 401 million km apart (249 million miles) when they are in opposition and both are at aphelion. The average distance between the two is 225 million km. When Mars is Close, Youâre Go For Launch. Mars and Earth reach this closest point to one another approximately every two years. And this is the perfect time to launch a mission to the Red Planet.
At a distance of 5826 miles (9380 km) from Mars, Phobos appears as no more than a tiny, bright dot in the Martian sky. It is so close to Mars that it cannot be seen above the horizon from all points on the planet. Because it is so close, it takes a little more than 7 hours to orbit Mars.