The graph below plots the escape velocity of several solar system objects along the vertical axis and the surface temperature along the horizontal.The lines plotted in the figure are the average speeds of gas particles as a function of temperature for various gases.Which of the objects in this diagram has the lowest surface temperature? 
Definitions:
Satyriasis
A condition of compulsive sexual desire in men.
Klismaphilia
A paraphilia in which a person gets sexual pleasure from receiving enemas.
Nymphomania
An outdated term historically used to describe excessive or uncontrollable sexual desire in women; now more appropriately referred to as hypersexuality.
Necrophilia
A paraphilia involving recurrent, intense urges to engage in sexual activities with a corpse.
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