In terms of the radius, the biggest star is UY Scuti, a giant celestial color constellation Scutum red in. Located 9,500 light-years from Earth, UY Scuti include hydrogen, helium and heavier elements similar to the chemical composition of the sun. However, this star has a diameter greater than 1,708 times that of the sun.
The Epoch Times, a diameter of nearly 1.2 billion UY Scuti km, while the length of the circumference is 7.5 billion km. One needs 950 years to fly around the stars by commercial aircraft. Even light takes 6 hours and 55 minutes to move around UY Scuti. If replacing the Sun, the surface of UY Scuti would lie between the orbits of Jupiter and Saturn and the Earth will be swallowed by the star.
With its huge size and weight than 20-40 times the Sun, UY Scuti gas molecule density is 7 × 10⁻⁶ kg / m³, ie more than a billion times less dense than water. Theoretically, if you can put in a water tank big enough, this planet will emerge.
UY Scuti can own maximum size but not the head space volume. Champion comment by mass in the universe is an r136a1 star, located in the Large Magellanic Cloud, 165,000 light-years from Earth in the morning.
The r136a1 atmosphere also consists of hydrogen, helium and heavier elements. Its radius 35 times greater than the Sun but much more mass than 265 times. According to scientists, the star has lost weight by 55 Sun in 1.5 million years of existence. R136a1 kind of unstable star. It has the atmosphere, blue and emit super strong solar winds, moving at the speed 2.600km / s.
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