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AU(astronomical unit) is not an unit of time but distance. It is a mean distance between Earth and Sun and it's roughly equal 150 million kilometers. If you are asking for straigth line distance between Mars and Earth, it can be anything between about 0.52 AU, when the planets are closest together and 2.52 AU when they are on opposite sides of Sun.

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16y ago

What else can I help you with?