Most of them look white, but some are distinctly red in color while others are blue. A star's color tells us about its temperature and mass, and blue stars are the hottest and most massive...
The hottest stars, blue horizontal branch (BHB) stars, are called extreme horizontal branch (EHB) stars and can be hotter than main sequence stars of the same luminosity.
The hottest stars are blue, with temperatures around 25,000 K. Red is the color of the coldest stars, which have surface temperatures of approximately 3,000 K. While the five star colors are blue, white, yellow, orange, and red, there are in between colors.
A list of the brightest blue giant, supergiant, hypergiant and other blue colored stars that can be found in the night sky by eye, binoculars, or modest sized telescope.
A blue giant star is amongst the hottest and largest stars in the Universe, with red stars being the coolest. A red giant star can be larger than the largest blue giant star.
In summary, blue stars are the hottest type of stars in the universe due their massive size and rapid fusion rate. Surface temperatures over 30,000 K allow blue stars to burn through their fuel in only millions of years before dying in spectacular supernovae.
Blue stars are real, representing the most luminous and energetic stars in the cosmos. They dominate the faint background light of galaxies. Their color is a direct consequence of having the highest surface temperatures in the universe, not atmospheric effects.
Some stars appear to defy time itself. Nestled within ancient star clusters, they shine bluer and brighter than their neighbours, looking far younger than their true age. Known as blue straggler stars, these stellar oddities have puzzled astronomers for more than 70 years. Now, new results using the NASA ESA Hubble Space Telescope are finally revealing how these “forever young” stars come ...
Elephant trunk–like dust pillars point toward the hot blue stars and are telltale signs of their eroding effect. Star formation started at the center of the cluster and propagated outward, with the youngest stars still forming today along the dust ridges.
The hottest stars tend to appear blue or blue white, whereas the coolest stars are red. A color index of a star is the difference in the magnitudes measured at any two wavelengths and is one way that astronomers measure and express the temperature of stars.
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