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Tenth brightest star in the night sky. [71] Widely recognised as being among the largest known stars, [21] radius decreased to ~500 R ☉ during the 2020 great dimming event. [75] R Horologii: 630 [60] 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.
Rare ultramassive stars that exceed this limit – for example in the R136 star cluster – might be explained by the following proposal: Some of the pairs of massive stars in close orbit in young, unstable multiple-star systems must, on rare occasions, collide and merge when certain unusual circumstances hold that make a collision possible. [3]
The following is a list of stars with resolved images, that is, stars whose images have been resolved beyond a point source. Aside from the Sun , observed from Earth , stars are exceedingly small in apparent size, requiring the use of special high-resolution equipment and techniques to image.
Once considered as having the largest angular diameter of any star in the sky after the Sun, Betelgeuse lost that distinction in 1997 when a group of astronomers measured R Doradus with a diameter of 57.0 ± 0.5 mas, although R Doradus, being much closer to Earth at about 200 ly, has a linear diameter roughly one-third that of Betelgeuse. [132]
[3] [62] [65] The star is very unstable, having a prodigious mass loss such as in ejections. VY Canis Majoris is a candidate for a star in a second red supergiant phase, but this is mostly speculative and unconfirmed. [66] From this star CO emission is coincident with the bright KI shell in its asymmetric nebula. The star will produce either:
SN 1006 was a supernova that is likely the brightest observed stellar event in recorded history, reaching an estimated −7.5 visual magnitude, [3] and exceeding roughly sixteen times the brightness of Venus.
The discovery marks the largest number of individual stars ever detected in the distant universe. ... While the Hubble Space Telescope was able to previously observe seven of the 44 stars detected
List of largest known star clusters Cluster name Diameter (light-years) Type of cluster Notes Terzan 7: 316 [1] Globular cluster: Messier 54: 306 [2] NGC 339: 238 [3] Messier 3: 226 [4] Messier 11 (Wild Duck Cluster) 190 [5] Open cluster: Messier 2: 174.4 [6] Globular cluster: Omega Centauri: 172 ± 12 [7] Largest globular cluster in the Milky ...