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## Homework Statement

Assume that a planet just like earth is orbiting the bright star vega at a distance of 1AU. The mass of vega is twice that of the sun.

a. How fast is the earth like planet traveling around vega?

b. How long will it take to complete one orbit around vega?

## Homework Equations

P2= r3 x (4x3.14/GM2)

## The Attempt at a Solution

Is the relationship directly proportional? will the speed of the planet be 365.24days per period/2 ? or does the formula above need to be pluged into a seperate formula to determin speed? Or is the escape velocity formula needed?