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## Homework Statement

The asteroid Ceres has a mass of 7x10^20 and a radius of 500km

a. what is the gravity on the surface

b. How much would a 85kg astronaut weigh in ceres

## Homework Equations

Fg = (Gm1m2)/r^2

## The Attempt at a Solution

None, where do I get the seccond mass value from? or am I using the wrong equation?

pls help, all constructive input appreciated :)