Star Sizes

In our galaxy Star come in various sizes. Mostly because of their distance we see them only as a shining spots on the night sky. Because of the same reason (distance) we see our Sun as large disc. Star size is measured using intereferometer telescopes or using the technique called occultation. Stars come in variety of sizes. Star can be small as only 20 km in diameter like some neutron stars or they can be supergiants with 1000 times larges of our suns.

Largest known star to human race is VY Canis Majoris which have around 2000 radiuses of our sun.

List of the largest stars

Star name Solar radii

(Sun = 1)

VY Canis Majoris 1800 to 2100
WOH G64 1738
VV Cephei A 1600 to 1900
Mu Cephei (Herschel’s “Garnet Star”) 1224-1650
V354 Cephei 1520
RW Cephei 1260 to 1610
KW Sagittarii 1460
KY Cygni 1420 or 1440
Betelgeuse (Alpha Orionis) 880 to 1000
Antares (Alpha Scorpii) 800
V838 Monocerotis 800
V382 Carinae 747
S Pegasi 580
T Cephei 540
S Orionis 530
W Hydrae 520
119 Tauri (Ruby Star)[7] 510
R Cassiopeiae 500
Delta Canis Majoris (Wezen) 482
Chi Cygni 470
Alpha Herculis (Ras Algethi) 460
Rho Cassiopeiae 450
Mira A (Omicron Ceti) 400
V509 Cassiopeiae 400 to 900
S Doradus 100–380
R Doradus 370
HR Carinae 350
R Leonis 350
The Pistol Star 340
La Superba (Y Canum Venaticorum) 300
Deneb (Alpha Cygni) 220
LBV 1806-20 200
Eta Carinae 85 to 195
Epsilon Aurigae A 175
Zeta Aurigae 160
Epsilon Pegasi (Enif) 150
Gamma Crucis (Gacrux) 113
Gamma Andromedae 83
Alpha Leporis (Arneb) 77
Rigel (Beta Orionis) 70
Epsilon Carinae 70
R Coronae Borealis 65
Canopus (Alpha Carinae) 65
Delta Orionis (Mintaka) 60
Zeta Orionis (Alnitak) 60
Alpha Persei (Mirfak) 60
Zeta Geminorum (Mekbuda) 60
Eta Aquilae 60
Gamma Draconis (Eltanin) 50
Aldebaran (Alpha Tauri) 43
Beta Ursae Minoris (Kochab) 41
Beta Cygni A1 16

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