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HOME  >  SCIENCE  >  ASTRONOMY

Size comparison: Betelgeuse vs VY Canis Majoris



Size comparison between two super giants, Betelgeuse and VY Canis Majoris.

VY Canis Majoris is a red hyper giant very rich in oxygen. This star is very far from the sun, since it would take 3,900 years to reach its system with a vessel that would go at the speed of light. It is one of the brightest stars in the Milky Way. It is a very young protostar which will undoubtedly explode quite quickly into a supernova, in 100,000 years.

VY Canis Majoris
VY Canis Majoris


Object Betelgeuse VY Canis Majoris
TypeStar, red supergiantStar, red supergiant
Age8.5 million years8.2 million years
Diameter1,235,310,708 km1,975,788,000 km
Mean radius617,655,354 km987,894,000 km
Mass2.29 × 1031 kg3.4 × 1030 kg
Surface gravity-0.001 m/s²0.006 m/s²
Circumference1.2 billion km1.9 billion km
Surface area1.5 × 1018 km21.22 × 1019 km2
Volume9.87 × 1026 km34 × 1027 km3
Average orbital speed5 km/s5 km/s
Atmosphere composition hydrogen,
helium
hydrogen,
helium
Crust composition hydrogen,
helium
hydrogen,
helium
Sun distance724 light years3,820 light years
Luminosity5.73 × 1031 W1 × 1032 W
Photosphere temperature3,590 K3,490 K
Metallicity0.05-0.3
Spectral classificationM1–M2 Ia–abM3–M4.5
Right ascension05h 55m 10.29s07h 22m 58.32s
Declination+07° 24′ 25.3″−25° 46′ 03.2355″


Note: if one of the objects is not visible, it just means that it is too tiny to be displayed compared to the other one.


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