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Red dwarfs are small cool stars that usually have less than 10 per cent the mass of the Sun with surface temperatures ranging between about 2,500K and 4,000K. Although they are the most common type of star in the Universe they are intrinsically faint and not a single red dwarf is visible to the naked eye from Earth.

Examples include, Proxima Centauri (mag. +11.1) and Barnard's star (mag. +9.5).

The two bright stars are Alpha Centauri (left) and Beta Centauri (right). The faint red star in the centre of the red circle is Proxima Centauri.

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