I'm working on a problem that has me baffled mathematically. What equation can I use to calculate the future distance between two galaxies not gravitationally bound receding at a hubble constant of 70km/sec/Mpc as a function of time. Stated in another way, if two distant galaxies start off today at a separation of 1.46Mpc, how far apart will they be in 4 billion years, assuming a hubble constant of 70km/sec/Mpc?. I know as a function of distance how to calculate the veloicty V = Hd but how can I write an equation to calculate distance between galaxies as a function of time?. Thanks anyone have any sugggestions? hopefully this wont involved integrals or diff eq...(adsbygoogle = window.adsbygoogle || []).push({});

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# Calculate separation of galaxies as a function of time

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