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Visibly the brightest star in our night sky is Sirius. It has a luminosity 23 times that of our Sun. Sirius is an example of a type of star called main sequence stars and has a surface temperature of 10 000°C. The type of star known as supergiants, e.g., Antares and Betelgeuse, are much cooler (under 3 000°C) but have a greater luminosity (700 times) because of their size. Another star type, the white dwarfs, e.g., Procyon B have temperatures around 15 000°C but are only 1/100 the brightness of the Sun.
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