Size of the Stars

Due to their great distance from the Earth, all stars except the Sun appear to the human eye as shining points in the night sky that twinkle because of the effect of the Earth's atmosphere. Astronomers measure the size of stars by comparing with sun's radius. Alpha Centauri A, with a radius of 1.05 solar radii, is slightly bigger than sun. Rigel is much larger at 78 solar radii, and Antares has a huge size of 776 solar radii, and the super giants like Betelgeuse in the Orion constellation is nearly 1300 solar radii imagine it’s 1300 times bigger than the sun, however Betelgeuse has lesser density than sun.
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