----------------------------------- 2SKY 18 Ian 2016 22:01 ----------------------------------- Dar asta cu Sirius sa fie albastra , din cauza stelei sau e si modificata ? . Iar focalizarea la fel . http://www.universetoday.com/11185/sirius-white-dwarf-companion-weighed-by-hubble/ . Aici zice ca masoara masa stelei prin , intensitatea cimpului magnetic care altereaza undele de lumina emise de stea. :shock: .Now, an international team of astronomers has used the keen eye of NASA’s Hubble Space Telescope to isolate the light from the white dwarf, called Sirius B. The new results allow them to measure precisely the white dwarf’s mass based on how its intense gravitational field alters the wavelengths of light emitted by the star