1) Astronomers estimate that a low-mass red dwarf star like Proxima Centauri will shine on the main sequence for four trillion years. Speculate why this star would last so much longer than the estimate in the table.

2) The star Mira is 1.2 times the mass of the Sun and about 10,000 times more luminous than the Sun. Would Mira fit into the table above? Why or why not?

 

Mass Life time, (Solon) Luminosity Luminsitg in Selan Luminosity (Solan Litetime) Name Mass in Solon Lite time in Mass Lite time The Sun 1. 1 10 year . Eda caninae. ISO 5,000, 00 0 O.00003 Rigel 18 120,000 O' 00015 15 x 10 4 Spi ca 10 833X10'g T, 0. 000833 Bellatnix 8. 6,400 U. 001 as 1as x 18 y A Chennan 3 000 O'002 2x10'y Sinius 2 25 O. 08 8 x 10'y Alpha Centaum A 1.1 1.5 0.733 733 X10 E psilon Enidan 0.33 0.8 242 x10y 2.42 Lacaille 935a 0.033 - 10 15.151 IS.IS XI0 y. 0.12 0.002 10 proxima Centaun, 6ox10" 60