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What is the luminosity of Betelgeuse?
Betelgeuse has about 140,000 times the luminosity of our sun or about 5.37×1031 watts.
Why might a Proxima Centauri look dimmer than a Betelgeuse?
Proxima Centauri has an insignificant luminosity to Betelgeuse. Although it is the closest known star(4.2 light-years) to our Sun, it is virtually impossible to see because it is so dim. Betelgeuse, on the other hand, is a lot farther (640 light-years). Yet, it is one of the brightest stars in our night sky. This is because Betelgeuse has an extremely high luminosity.
Why do cool stars have greater luminosity than our sun?
They do not necessarily have greater luminosity, it depends on their size. Betelgeuse is cooler and brighter; a red dwarf is cooler and less bright.
How can you tell that Rigel is brighter than Betelgeuse?
The simple answer is by looking at them.The technical answer is by analysing their bolometric luminosity with a bolometer.
Betelgeuse is the brightest star in the constellation Orion However Betelgeuse is a cool red star that is 520 light years from Earth How can Betelgeuse look so bright if it is that far away?
It isn't the brightest star - at least, usually Rigel is brighter. However, Betelgeuse is variable, and can sometimes be brighter than Rigel. Wikipedia lists its luminosity as 105,000 times the luminosity of our Sun; and the distance, as 640 light years. Assuming these numbers, this would make it as bright as a star that is 10.5 times as bright as our Sun, at a distance of only 6.4 light years. In other words, the extreme luminosity compensates for its distance.
Is there a second star that is like the sun?
Betelgeuse, part of Orion, the Hunter shines with 60 000 times the Sun's luminosity.
What type of stars has low temperature but high luminosity?
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
What type of stars has high temperature but high luminosity?
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
What type of stars low temperature but high luminosity?
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
What is the definition of a supergiant?
Any of various very large bright stars, such as Betelgeuse, having a luminosity that is thousands of times greater than that of our sun.
Is Vega or Betelgeuse the brightest star?
Brightness is a function of a stars luminosity as observed from Earth. So our Sun is the brightest. Vega has an apparent magnitude of: 0.03 Betelgeuse has an apparent magnitude of 0.42 So, in apparent magnitude, Vega is brighter.
What is the size of the betelgeuse?
Betelgeuse boasts the diameter greater than the orbit of Jupiter. It has a mass of around 20 times the mass of the Sun, and its luminosity is almost 200,000 times greater than the Sun. So really, it is one of the biggest and brightest stars ever observed.
