Red+Giants+4A



The red giant is a stage of a star that occurs because the area of hydrogen fusion constantly moves outward, which leaves a helium core.

=Red Giants= For stars of less than 4 solar masses, hydrogen burn-up at the center triggers expansion to the red giant phase.

The sun as a red giant in about 5 billion years, when it will be about 2,000 times brighter and 100 times larger. Red Giants are 1000 times bigger than our sun. They are also 10,000 times brighter than the sun.

An evolved giant star with a surface tempature of 2,500 to 3,500 degrees celcius, a special type of M or K, and a diameter between 10 and 100 times that of the sun