Stars are formed from clouds of gas and dust that, as they contract, heat up and radiate heat and light. But not all stars are created equal. We can establish relationships between the color we see and the temperature of a star. Check it out:
Stars defined with colors
Red stars Have surface temperature between 3,000°C;
Orange stars - On the surface, its temperature is between 4,000°C;
Yellow stars - Surface temperature of more or less 6,000°C;
White stars - Around 11,000°C on its surface:
Blue stars - Have a surface temperature of around 25,000°C.
As you can see, the "hottest" stars are those with a bluish color, such as Sirius Alpha in the Constellation of Canis Major, which is apparently the brightest in the night sky and is 8.57 light-years away from Earth.
The "coldest" ones are the red ones, like the star Antares, in the Constellation of Scorpio, which despite its "low" temperature, is 700 times bigger than the Sun and is a measly 600 light-years away from US.
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