You can work it out on a piece of paper in a laboratory, get a telescope, swing it to the sky, and you find that there are no dead stars bigger than 1.4 times the mass of the Sun.
Možete to izračunati na komadiću papira u laboratoriju, uzmite teleskop, okrenite ga ka nebu i vidjeti ćete da nema mrtvih zvijezda većih od 1.4 puta mase Sunca.