Q. Why do things weigh differently on other planets?
A. Things weigh differently because other planets have different gravitational forces.
Q. On which planet would you weigh the most? The least?
A. On the Jupiter I would weigh the most, but on Mars and Mercury I would weigh the least.
Q. Why are ages different on different planets?
A. Everyone has a different age on other planets because planets have different time lengths in their year. It takes longer for planets to orbit the sun depending on their distance from the sun. The further they are, the longer it takes.
Q. On which planet would you expect to be the youngest? The oldest?
A. On Neptune I would be youngest and on Mercury I would be the oldest. Neptune has the longest year and Mercury has the shortest year due to their distances from the sun.