Question

In cat timp ajunge lumina de la o stea la noi daca distanta e 144×10 la a 16 km?

Answer 1

$\displaystyle c=300000km/s \\ \\ t=\frac{d}{c}=\frac{144\times 10^{16}}{3\times 10^5}=4,8\times 10^{12}s$