NhStars= number of stars with human habitable planets Given the radius, the number of stars or habitable stars will be: Nstars= Rpc^3 * 0.35 Nstars= Rly^3 * 0.01 NhStars= Rpc^3 * 0.075 NhStars= Rly^3 * 0.0022 If your calculator does not have a cube root button, you can use th...