10 Largest Known Stars in the Universe

The universe is a mystery and no clue how deep our universe is. The Estimation of the real size of the stars and planets are still not confirmed. The radius of the sun is approximately 695,500 km or 432,450 miles. Larger stars are measured in Solar Radii (unit of distance used to express the size of stars), the Magellanic Clouds has the red supergiant stars where 44 of them are larger than 700 solar radii. There is 10 Known Stars estimated size shown below with solar radii. The size comparison of stars and planets image shown below.

UY Scuti - Size Comparison

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10. AH Scorpii

It is a red supergiant star in the constellation of Scorpius, the luminosity, temperature and shrouding gases of dust estimates leads huge different in size.
Constellation: Scorius
Solar radii (R☉): 1,411
Temperature: 3,500

9. VY Canis Majoris

VY is one of the most luminous of its type located in the Canis Major, and 3,900 light years distant from earth, diameter of about 1,976,640,000.
Constellation: Canis Major
Solar radii (R☉): 1420
Solar mass (M☉): 17
Luminosity (L☉): 270,000

8. RW Cephel

RW is one of the brightest stars in the universe over half million times brighter than sun, located in Cepheus, the surface temperature is around 4015 K.
Constellation: Cepheus
Solar radii (R☉): 1,435
Solar mass (M☉): 40
Luminosity (L☉): 555,000

7. VV Cephel A

The VV Cephel A also known as HD 208816 is a red supergiant star located in consellation of Cepheus, and 5,000 light years from earth, temperature of the surface is around 3,800 to 25,000k.
Constellation: Cepheus
Solar radii (R☉): 1,475
Solar mass (M☉): 20-25
Luminosity (L☉): 200,000-320,000

6. VX Sagittarii

It is hypergiant pulsating variable star situated over 1.5 kiloparsec away from sun, and the temperature from around 2,500k to 3,500k.
Constellation: Sagittarius
Solar radii (R☉): 1,520
Solar mass (M☉): 7-11
Luminosity (L☉): 340,000

5. WHO G64

A red hypergaint star is located in southern constellation of Dorado, and 168,000 light years away from earth and 3.65 billion times bigger than the sun.
Constellation: Dorado
Solar radii (R☉): 1,540
Solar mass (M☉): 16-22
Luminosity (L☉): 280,000

4. Westerlund 1-26

It was discovered by the astronomer Bengt Westerlund in 1961, the surface temperature is 3000 K and seems very cool star, located 3.55k Parsec from earth. It has not been seen to change its luminosity, unlike other stars.
Constellation: Ara
Solar radii (R☉): 1,555
Apparent magnitude: 16.79

3. PZ Cassiopeiae

The PZ Cassiopeiae is high luminous, a semi-regular variable star and red supergiant star estimated 7800 light years away from earth, the visual range is 8.75 magnitude.
Constellation: Cassiopeia
Solar radii (R☉): 1,565
Solar mass (M☉): 25
Luminosity (L☉): 240,000 – 270,000

2. NML Cygni

Sometimes considered as largest star, here the size estimated from 1,642 to 2775 solar radius equal to 7.67 astronomical units, and 5,300 light years from earth, 4.5 billion times that of sun.
Constellation: Cygnus
Solar radii (R☉): 1,650
Solar mass (M☉): 25-40
Luminosity (L☉): 270,000

1. UY Scuti

It is the bright supergiant Star, currently largest known star in the universe, 2,378,704,272 in diameter and volume 4,982,686,912 times that of sun , approximately 9,140 light years from Earth.
Constellation: Scutum
Solar radii (R☉): 1,708
Solar mass (M☉): 32
Luminosity (L☉): 270,000