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Quite simply because Rigel is still on the main sequence whereas Betelgeuse has come off the main sequence and is only fusing helium in it's core, whereas Rigel is still fusing hydrogen in it's core.
This is the reason for the difference in temperature.
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∙ 13y ago
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Is Betelgeuse hotter than Rigel?
No, Rigel is hotter. Rigel is a blue star with a temperature of about 11,000 K, and Betelgeuse is a red star with a temperature of about 3,500 K.
Why does rigel shine as brightly as betelgeuse even though rigel is much smaller than betelgeuse?
Simply because Rigel is hotter.
Which is larger Rigel or Betelgeuse?
Betelgeuse is much larger than Rigel.
Which star is brighter Betelgeuse or Rigel?
Rigel is brighter than Betelgeuse.
Why does Rigel shine as brightly as Betelgeuse even though Rigel is much smaller?
It's hotter
Is Betelgeuse hotter than Rigel?
No, Rigel is hotter. Rigel is a blue star with a temperature of about 11,000 K, and Betelgeuse is a red star with a temperature of about 3,500 K.
Why does rigel shine as brightly as betelgeuse even though rigel is much smaller than betelgeuse?
Simply because Rigel is hotter.
How can you tell if Rigel or Betelgeuse is hotter?
Rigel is hotter by a long way with a temperature of 11,000 Kelvin, whereas Betelgeuse is a cool 3,500 Kelvin
Which star is brighter Betelgeuse or Rigel?
Rigel is brighter than Betelgeuse.
Which is larger Rigel or Betelgeuse?
Betelgeuse is much larger than Rigel.
Why does Rigel shine as brightly as Betelgeuse even though Rigel is much smaller?
It's hotter
How big is Betelgeuse compared to Rigel?
Betelgeuse is much larger than Rigel. Betelgeuse has a radius about 15 times the radius of Rigel, and a volume of about 3500 times Rigel.
Why does Rigel shine as bright as Betelgeuse even though Rigel is much smaller than Betelgeuse?
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Betelgeuse appears red in the sky Rigel appears very white Which one is hotter?
Rigel is much hotter. Red is the lowest temp. blue and white are the hottest
How many times larger is Betelgeuse in terms of diameter than Rigel?
Betelgeuse is around 10 times greater in diameter than Rigel.
What are the colors of Rigel and Betelgeuse?
Rigel is blue and Betelgeuse is red.
Is the star Betelgeuse hotter than our sun?
No. The sun is actually hotter than Betelgeuse, but much smaller.
