Trip to Mars Footnote

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Why does the trip occur every 26 months?

 Short answer: Earth and Mars are only lined up once every 26 months. When this happens, the distance between Earth and Mars is the closest, so the trip will be the shortest.

Why is it 26 months, and not some other amount?

 Math.

A year on Mars is about 687 days, and a year on Earth is around 365 days.(We assume a month is 30 days.) After 26 months, the Earth has traveled about 769 degrees, or 2 complete revolutions and 49 degrees. Mars has traveled about 408 degrees, or 1 complete revolutions and 48 degrees. It is not exactly 22 months, but about 22 months.

How do you know how long a year on Mars is?

 Science.

How do you know that is accurate?

Stop asking so many questions! We're trying to keep this simple!

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