The least massive red main- sequence stars may have lifetimes of a trillion years.
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Q7: About 90% of the star's total life
Q8: The luminosity of the red giant during
Q9: The main reason that stars evolved off
Q10: Helium fusion requires a higher temperature than
Q11: The helium flash increases the star's luminosity.
Q13: The helium flash stage lasts several thousand
Q14: Low- mass stars may become hundreds of
Q15: A star system may undergo two or
Q16: As a main- sequence star, the Sun's
Q17: The helium flash shows up on the
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