$${\frac{dM}{dt} = (1,33 \times 10^{20}\, \mathrm{aatomit/s})(3,90 \times 10^{-25}\, \mathrm{kg/aatom}) \\ = 5,19 \times 10^{-5}\, \mathrm{kg/s} \approx \underline{\underline{4,5\, \mathrm{kg/\text{päevas}}}}}$$