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Why are red dwarf stars the most common star in the Galaxy?

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NASA's Hubble Space Telescope captures the image of the red dwarf star CHXR 73 and its companion, thought to be a brown dwarf. CHXR 73 is one-third less massive than the sun. Credit: NASA, ESA and K. Luhman (Penn State University). read more

The closest star to the sun, Proxima Centauri, is a red dwarf. Despite its frequent appearance, the term "red dwarf" does not refer to a single kind of star. It is frequently applied to the coolest objects, including K- and M-dwarfs, which are true stars, and brown dwarfs, often referred to as "failed stars" because they do not sustain hydrogen fusion in their cores. read more

In other words, no red dwarf has yet died, the Universe isn’t old enough! The Sun is expected to exist as a main sequence star for some 10 billion years, but a red dwarf one tenth its size ought to shine on for a thousand times longer, ten trillion years. In our galaxy, the Milky Way, red dwarfs are the most common type of star. read more

Red dwarfs are by far the most common type of star in the Milky Way, at least in the neighborhood of the Sun, but because of their low luminosity, individual red dwarfs cannot be easily observed. From Earth, not one is visible to the naked eye. read more

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