gravitational force between the Sun and the Earth ?

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Solidsnake B

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what would happen if the Earth was 2 times further away than now?

How would this affect the motion of Earth, if the Sun’s mass didn’t change?
 
The Earth would move much more slowly around the sun if it were twice as far out. The "year" would be much longer. The speed of the orbit depends on the mass of the earth and the gravitational pull of the sun.
Not sure of the formulas, but it may be the square of the distance, so the earth would be moving one forth the speed - that would make the year 4 times as long.
 
Kepler's third law.

Since mass does not change, you can use the simple version.

a^2=p^3

a = distance in AU
p = period in "earth" years.

At two AU, the equation would look like this:

2^2 = p^3
4 = p^3
1.587 = p

It would orbit the sun in roughly 1.587 years.
 
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