- #1
season89
- 3
- 0
After looking at where the isogravitational point between the Earth and the moon was, I thought about practically what sort of speed you would want to cross it at.
Of course, if time is not a factor, I imagine you would ideally want to expend as little fuel possible in getting from planet to planet (or planet to moon etc. etc.). Therefore you would want to cross this point at which the gravitational pull from both bodies cancel each other out at the slowest possible rate. I guess this would theoretically mean that you would spend eternity at the point.
In a practical sense though time is a factor, and more importantly if you have manned mission then there would be a trade off between the amount of fuel spent on getting to (and past) this point and completing the journey in a timely manner so that your crew don't starve. This brings up the other problem of time spent in space proportional to the amount of food (payload) needed in the shuttle, thereby requiring more fuel achieve escape velocity from the Earth.
Question:
I was wondering if anyone knew (for example on journeys to the moon) what speed at which this iso-gravitational point would be passed so as to minimise both fuel use and time spent on the journey. And if so, would there be a formula based on the distance between, and sizes of, both bodies. Finally I would love to find out whether there is a proposed limit to how far manned journeys could be (and the crew still be alive at the end of the journey).
Thanks,
Warwick
Of course, if time is not a factor, I imagine you would ideally want to expend as little fuel possible in getting from planet to planet (or planet to moon etc. etc.). Therefore you would want to cross this point at which the gravitational pull from both bodies cancel each other out at the slowest possible rate. I guess this would theoretically mean that you would spend eternity at the point.
In a practical sense though time is a factor, and more importantly if you have manned mission then there would be a trade off between the amount of fuel spent on getting to (and past) this point and completing the journey in a timely manner so that your crew don't starve. This brings up the other problem of time spent in space proportional to the amount of food (payload) needed in the shuttle, thereby requiring more fuel achieve escape velocity from the Earth.
Question:
I was wondering if anyone knew (for example on journeys to the moon) what speed at which this iso-gravitational point would be passed so as to minimise both fuel use and time spent on the journey. And if so, would there be a formula based on the distance between, and sizes of, both bodies. Finally I would love to find out whether there is a proposed limit to how far manned journeys could be (and the crew still be alive at the end of the journey).
Thanks,
Warwick