The graph below plots the escape velocity of several solar system objects along the vertical axis and the surface temperature along the horizontal axis. The lines plotted in the figure are the speeds of the fastest gas particles as a function of temperature for various gases. Which of the objects in this diagram has the greatest surface temperature 
Definitions:
Regressive Tax
A taxation system where the tax rate decreases as the taxable amount increases, leading to a higher tax burden on lower-income individuals relative to higher-income individuals.
Progressive Tax
A tax system where the tax rate increases as the taxable amount or income increases, placing a larger burden on those who have the ability to pay more.
Federal Income Tax
A charge imposed by the US federal government on the yearly income of persons, companies, trusts, and various legal bodies.
Excise Tax
A tax on the sale or consumption of a specific product or service, often levied at the point of manufacture or sale.
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