A good reason for why aliens want to take over Mars?

In a future where Mars has been abandoned for several thousand years, and Earth has reverted to a somewhat-habitable state, why would aliens choose to live on Mars, rather than more habitable Earth? They are very similar to humans in almost every facet except appearance, and Mars was, before its abandonment, a thriving colony world.

Edit: For clarification, Humans have long been gone from the Solar System, and have moved on to other star systems in the galaxy. The Aliens and humans have not made contact yet, but the aliens are aware of the human's previous habitation of Earth and Mars. Aliens simply want to study the solar system up close and personal.

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A good reason for why aliens want to take over Mars?

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