SOLAR SYSTEM

Detailed explanation-1: -You can tell the temperature of the star. Red stars are the coolest. Yellow stars are hotter than red stars. White stars are hotter than red and yellow.

Detailed explanation-2: -Any colour that is present is an indication of how hot a star’s visible ‘surface’ is. The coolest stars are red with surface temperatures of about 3, 000ºC. As a star’s temperature increases, as a result of there being more gas in the star – and hence more fuel to burn – it becomes hotter.

Detailed explanation-3: -They start out as regular stars, but they grow to such an enormous size that their heat is spread out across a much larger surface area. This is why they appear very bright, but still have a red color.

Detailed explanation-4: -Red dwarfs are the coolest main-sequence stars, with a spectral type of M and a surface temperature of about 2, 000–3, 500 K. Because these stars are so cool, spectral lines of molecules such as titanium oxide, which would be disassociated in hotter stars, are quite prominent.

Detailed explanation-5: -The fact that stars come in different colours is not a mere curiosity. The colour provides a fundamental piece of data in stellar astrophysics-the surface temperature of the star. The hottest stars are blue and the coldest are red, contrary to the use of colours in art and in our daily experience.

Detailed explanation-6: -Aldebaran and Betelgeuse are cool stars and appear as reddish stars.