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A relatively low surface temperature means that reg giants radiate relatively little energy per area unit, but since they have a very large surface area, the total amount of energy radiated is enormous.

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Q: Why are the supergiant stars so bright even though they are not very hot?
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Related questions

How do you explain what the differences are between main sequence stars white dwarf stars and supergiant stars?

A star on "main sequence" is a period in a stars evolution.A white dwarf is a stellar remainA supergiant star is the size of a very big star.So they are completely different and not even related.


What stars are cool and bright stars?

To be bright you need to be hot, close or have a large surface area. The brightest coolest stars are red super giants. They have such a large surface area, that even though their surface temperature is cool - in star terms - their large surface area makes them appear bright.


Which of stars is a super giant?

For example, Antares and Betelgeuse. (Even though the Sun is not categorized as a supergiant, don't forget that compared to anything on Earth, and to the whole Earth itself, the Sun is not a small thing.)


Why do you see other stars?

The sun is not the only star... There are many many others in the universe, they shine so bright that you can see them in the night sky even though they are very far away...


Why are other stars not bright like the sun?

The other stars do not appear as bright as the sun because they are much farther away. Even the closest stars apart from the sun are hundreds of thousands of times farther away. In terms of actual brightness, some stars are brighter than the sun.


How come you can't see the stars during the day?

Its callled light pollution, the sun shines so bright the it obscures even the brightest of stars.


What are bright cool stars?

To be bright you need to be hot, close or have a large surface area. The brightest coolest stars are red super giants. They have such a large surface area, that even though their surface temperature is cool - in star terms - their large surface area makes them appear bright.


What is the most common star category?

Bright stars are rare, dim stars are common, so class M are the most common that we can see, but even dimmer ones are postulated to be even more common.


The Clouds' Veil lyrics?

Even though the rain hides the stars, even though the mist swirls the hills, even when the dark clouds veil the sky, God is by my side. Even when the sun shall fall in sleep, even when at dawn the sky shall weep, even in the night when storms shall rise, God is by my side. God is by my side. Verse 1 Bright the stars at night that mirror heaven's way to you. Bright the stars in light where dwell the saints in love and truth. Verse 2 Deep the feast of life where saints shall gather in deep peace. Deep in heaven's light where sorrows pass beyond death's sleep. Verse 3 Blest are they who sing the fellowship of saints in light. Blest in heaven's King. All saints adore the Lord, most high.


Is Orion visible near city lights?

Yes; its main stars are bright enough to be seen even with normal city lights.


What happens to very massive stars when they die?

Smaller stars like our own expand into a red giant and then eventually collapse into a white dwarf, the more larger stars like a bright giant star expand into a hyper giant or a super giant. Super giant stars can go supernova and collapse into a neutron star, a white dwarf, or a black hole. The hyper giant stars go hypernova and make a gamma ray that eventually ends into a black hole.


Why does Rigel shine as bright as Betelgeuse even though Rigel is much smaller than Betelgeuse?

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