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Below are lists of the largest stars currently known, ordered by radius and separated into categories by galaxy. The unit of measurement used is the radius of the Sun (approximately 695,700 km; 432,300 mi). [1] The Sun, the orbit of Earth, Jupiter, and Neptune, compared to four stars (Pistol Star, Rho Cassiopeiae, Betelgeuse, and VY Canis Majoris)
These lists contain the Sun, the planets, dwarf planets, many of the larger small Solar System bodies (which includes the asteroids), all named natural satellites, and a number of smaller objects of historical or scientific interest, such as comets and near-Earth objects.
The size of UY Scuti compared to Earth's orbit and the Sun (barely visible) UY Scuti is a dust-enshrouded bright red supergiant [16] and is classified as a semiregular variable with an approximate pulsation period of 740 days.
Size comparison of the Sun, all the planets of the Solar System and some larger stars. The Sun is 1.4 million kilometers (4.643 light-seconds) wide, about 109 times wider than Earth, or four times the Lunar distance, and contains 99.86% of all Solar System mass. The Sun is a G-type main-sequence star that makes up about 99.86% of the mass of ...
A size comparison between R136a1 and the Sun. R136a1 is over forty times the radius of the Sun (42.7 R ☉; 29,700,000 km; 1 ⁄ 7 au) which corresponds to a volume nearly 80,000 times larger than the Sun. [4] R136a1 does not have a well-defined visible surface like the Earth or the Sun.
The metallicity of Vega's photosphere is only about 32% of the abundance of heavy elements in the Sun's atmosphere. [note 2] (Compare this, for example, to a threefold metallicity abundance in the similar star Sirius as compared to the Sun.) For comparison, the Sun has an abundance of elements heavier than helium of about Z Sol = 0.0172 ± 0. ...
Size comparison of μ Cephei and the Sun. A very luminous red supergiant, Mu Cephei is among the largest stars visible to the naked eye, and one of the largest known cool supergiants. It is a runaway star with a peculiar velocity of 80.7 ± 17.7 km/s, [16] and has been described as a hypergiant. [4]
The radius and temperature relative to the Sun means that it is 10,700 times more luminous than the Sun, and its position in the H-R diagram relative to theoretical evolutionary tracks means that it is 8.0 ± 0.3 times as massive as the Sun. [53] Measurements of its shape find a 1.1° departure from spherical symmetry.