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Widely recognised as being among the largest known stars, [19] radius decreased to ~500 R ☉ during the 2020 great dimming event. [70] R Horologii: 635 [55] L/T eff: A red giant star with one of the largest ranges in brightness known of stars in the night sky visible to the unaided eye. Despite its large radius, it is less massive than the Sun.
The actual limit-point mass depends on how opaque the gas in the star is, and metal-rich Population I stars have lower mass limits than metal-poor Population II stars. Before their demise, the hypothetical metal-free Population III stars would have had the highest allowed mass, somewhere around 300 M ☉ .
Below is a list of the largest known star clusters, ordered by diameter in light years, above the size of 50 light years in diameter. This list includes globular clusters , open clusters , super star clusters , and other types.
UY Scuti was analyzed to be the largest and the most luminous of the three stars measured, at 1,708 ± 192 R ☉ (1.188 × 10 9 ± 134,000,000 km; 7.94 ± 0.89 AU) based on an angular diameter of 5.48 ± 0.10 mas and an assumed distance of 2.9 ± 0.317 kiloparsecs (kpc) (about 9,500 ± 1,030 light-years) which was originally derived in 1970 ...
The largest of these may have a hydrostatic-equilibrium shape, but most are irregular. Most of the trans-Neptunian objects (TNOs) listed with a radius smaller than 200 km have " assumed sizes based on a generic albedo of 0.09" since they are too far away to directly measure their sizes with existing instruments.
This is a list of largest galaxies known, sorted by order of increasing major axis diameters. The unit of measurement used is the light-year (approximately 9.46 × 10 12 kilometers). Overview
Largest extrasolar apparent size star R Doradus: 1997 0.057" This replaced Betelgeuse as the largest, Betelgeuse having been the first star other than the Sun to have its apparent size measured. [NB 6] [NB 1] [41] Smallest apparent size star Thousands of neutron stars located on the other side of the galaxy, likely impossible to resolve. [NB 6]
A star whose initial mass is less than approximately 0.25 M ☉ will not become a giant star at all. For most of their lifetimes, such stars have their interior thoroughly mixed by convection and so they can continue fusing hydrogen for a time in excess of 10 12 years, much longer than the current age of the Universe. They steadily become ...