Main sequence stars are comprised chiefly of the same materials as most other stars: hydrogen and helium gas. In big old stars the ratio of heavier elements increases, due to nuclear fusion.
First of all, there cant be a white main-sequence star. White would be a white dwarf, red a giant or super giant. There can be blue, yellow, orange, red and anything in between those i guess. The...
Generally a blue star is on the main sequence. However, the colour of a star is related to its temperature. It's temperature is related to the mass of the star - the higher the mass (Size) the hotter...
Useless answer: Because there is an infinite number of stars there is also an infinite number of any subgroup of stars; Infinity divided by 5 billion = infinity ^^They mean the number of stars you...