The Sun has been a main-sequence star for about 4.5 billion years and it will become a red giant in 6.5 billion years,[52] for a total main sequence lifetime of roughly 1010 years.
While the sun's transition into a red giant is sad news for Earth, the icy planets in the most distant regions of our solar system will bask in the sun's warmth for the first time.
Alpha Herculis, a red giant star that varies from third to the fourth magnitude, is called Rasalgethi, from the Arabic meaning'the kneeler's head', which it marks.
When the sun becomes a red giant in about 4 billion years, our familiar yellow sun will turn a vivid red, as it mainly emits the lower frequency energy of infrared and visible red light.
Wolf-Rayet star WR 136(HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 400,000 years ago.
Some hypothesize that after the Sun becomes a red giant, its surface rotation will be much slower and it will cause tidal deceleration of any remaining planets.[27].
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