blue stars
what is the size of a blue star
25 times larger than the sun
why these stars are red?
because they have low temperature
what is the temperature of red stars?
2000-3000 C
how old are red stars?
billions of years old
what is the size of red giant stars?
100 billion to 1 billion kilometers
what is a red giant star?
is a luminous giant star of low or intermediate mass