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Because they have such a large surface area.
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Large bright stars that are fairly cool are called?
Red giants.
Why are red giants so bright if they are so cool?
Red giant stars emit less light per square meter of surface area than smaller, hotter stars, but their larger size means they have a larger surface area from which to emit light, so they emit more light overall.
If red giants are cool stars why are they so bright?
Red giant stars emit less light per square meter of surface area than smaller, hotter stars, but their larger size means they have a larger surface area from which to emit light, so they emit more light overall.
Are red giant stars the largest?
Yes red giants are the largest. But the bigger stars of red giants can be called red hyper giants.
Why are red giants bright?
A star's magnitude is assosiated with its surface area/size. The reason Red giants may be brighter than those within the same colou (B-V), is simply due to the fact that it is much larger. (which results in an increased magnitude/brightness/luminosity.)
What are Large stars that are bright but not hot are called?
They are red giants.
Large bright stars that are fairly cool are called?
Red giants.
What cool and bright stars are located in the upper right of the H-R diagram?
In the usual position of the axes, the upper-right is populated by giants and supergiants.
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 a crimson horn?
Crimson is a bright red color, so a crimson horn would be a bright red colored horn.
What color is red giants?
I'm going to have to go with red because in the question, it says "What color is a red giant?"Well its not always red, it might also be white or blue indicating that its bright and hot. But it is also red.
Why are red giants so bright if they are so cool?
Red giant stars emit less light per square meter of surface area than smaller, hotter stars, but their larger size means they have a larger surface area from which to emit light, so they emit more light overall.
What color is haemoglobin?
haemoglobin is blue in colour
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.
Why do hummingbirds like the color red?
No, they don't, but the bright colors attract them more
