A red star is fusing mostly hydrogen while a blue star has depleted its hydrogen supply and is fusing helium into heavier elements.
The red star is the coolest and the blue star is the hottest
The blue star is hotter than the red star.
Blue stars are the hottest, and red stars the coolest. Our sun is orangey, so it's kinda in between blue (hot) and red (cool).
blue and white stars are hotter than red stars (and newer).
It depends on what kind of red star you are referring to. There are red dwarfs and red giants. A blue star is larger than a red dwarf but smaller than a red giant.
Simple one is a black-red star and the other is black-blue star. The only difference is the color.
The mass of the star.
The differences between red and blue light are Red stands for n00b and blue stands for b00b! your mum
The red star is the coolest and the blue star is the hottest
the color
The blue star is hotter than the red star.
A red star is cool whereas a blue star is hot.
Blue stars are the hottest, and red stars the coolest. Our sun is orangey, so it's kinda in between blue (hot) and red (cool).
red has a lower frequency and a longer wavelength than blue
blue and white stars are hotter than red stars (and newer).
The blue star is the hottest star.
The only difference is the colour of the external shell.