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.
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Red Giants
the ones in the sky
Red giants.
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.
Hot stars are found in the left hand side of the diagram, cool stars the right, bright stars at the top, and lastly the faint stars are located at the bottom.
top,right
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
The flag has strips and bright stars
The celestial bodies are especially bright on a cool, clear night.
The ISBN of The Stars in the Bright Sky is 9780099461821.
The Stars in the Bright Sky was created in 2010.