What is the mass of the Sun referred to in scientific terms?

The mass of the Sun is commonly referred to using the symbol "M☉," where "☉" represents the solar mass. In more scientific terms, the mass of the Sun is often expressed relative to a standard mass unit used in astrophysics, which is the mass of the Sun itself denoted as "Mo."

Using "Mo" allows astronomers to discuss and compare the mass of other celestial objects in relation to the Sun. This standardized unit is particularly useful because it simplifies calculations in astrophysical contexts, like determining the gravitational interactions between different planetary bodies or stars based on their mass relative to the Sun.

In contrast, the other choices do not represent standard astronomical units for mass. "Lo" and "Ro" do not have established meanings relating to mass in scientific literature, while "h" typically represents the Planck constant or other quantities irrelevant to solar mass. Thus, "Mo" is the correct and commonly accepted term in scientific discourse regarding the mass of the Sun.