- #1

Dr Wu

- 174

- 39

On the same scrap of paper I copied the above quote, I also jotted down the following formula: R2/M (meaning radius squared divided by the mass of the object). Now I'm not sure if this formula actually belongs to the quote, but I've tried using it anyway, applying it in this instance to the Sun as a test case. I already know that the focal distance for the Sun tallies out at 550 AU. Unfortunately, I can't make the formula work. All I get are impossible answers - anything from between tens of thousands of light-years down to a measily 27 AU. . . not the required 550 AU. (I assume all measurements are supposed to be in metres and kilograms).

I would therefore be extremely grateful if someone knowledgeable on this subject can point me in the right direction. Many thanks.