1. A comet with a period of 125 years moves in a highly elongated orbit around the sun. What is it's semimajor axis in AU? What is the whole length of it's axis in AU?

2. If a comet is 75 AU from the Sun at it's closest approach. How far away from the sun is it at it's farthest approach.

3. A line joining the sun and a planet swept out an area of 6.3 AU2 in 2010. How much did it sweep out in 2021? How much would it sweep out in 5 years?

4. If the Earth was suddenly moved to three times its orbit from the sun, how would the gravitational force change? Express your answer in terms of a fraction of the original.