noun
solar mass
Astronomical unit of mass equal to the mass of the Sun, used to express the mass of stars, galaxies, and other celestial bodies.
この星の質量は太陽質量の約10倍です。
The mass of this star is about 10 solar masses.
Compound of 太陽 (taiyō, 'sun') and 質量 (shitsuryō, 'mass').