Obviously, that is the time when it is sensible to launch a rocket towards it and the next window that is happening is in July 2020. Mars is the closest to earth in terms of its environment. Then it is about half the size of earth and so it has a gravity that will be familiar to us, though it is less. This means that they are trying to transform the planet to make it earth-like, with an atmosphere that resembles ours and with a surface that is green. All of these factors make Mars attractive as a destination and that explains the deep interest in it and the many missions going there.
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