Can someone check my math? I want to be sure I understand Hubble’s Law. I know it’s not exact since there’s acceleration, inflation and flatness. But let’s leave all that out just to understand Hubble’s Law. The formulas are pretty simple. There are 2 parts one is for finding the recession velocity between objects and the other is Hubble’s Constant, which is not constant. It shrinks as the universe ages. H = 1 / UniverseAge V (km/s) = H (km/s/Mpc) * D (Mpc) The tricky part is converting H to km/s/Mpc. So here’s a better version. You can use any time frame in place of years. H(km/s/Mpc) = C(km/s) / C(Mpc/yr) * UniverseAge(yr) For an object 1 billion light-years (307Mpc) away today: H(0) = 300,000km/s / 307Mpc/Gyr * 13.7Gyr, H(0) = 71.4 v = 71 * 307, v = 22,000 km/s That looks good. Here’s another one. For an object 1 kilometer away 1 second after the Big Bang started: H = 300,000km/s / 9.72e-15Mpc/s * 1s, H(0) = 3.09e19 v = 3.09e19 * 3.24e-20, v = 1 km/s Wow, funny how that works out. So 1 second after the Big Bang, an object 1 kilometer away is receding away at 1 kilometer per second. That has nothing to do with reality since that’s still in an inflation period. But I just want to know if that’s right according to Hubble’s Law.