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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. 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 ☉ .
Mass loss is largest for high-luminosity stars with low surface gravity and enhanced levels of heavy elements in the photosphere. R136a1 loses 1.6 × 10 −4 M ☉ ( 3.21 × 10 18 kg/s ) per year, over a billion times more than the Sun loses, and is expected to have shed about 35 M ☉ since its formation.
This is currently the nearest known neighbouring star to our own Sun. This star was discovered in 1915, and its parallax was determined at the time, when enough observations were established. [NB 1] [1] [2] List of nearest stars and brown dwarfs: Most distant individually seen star WHL0137-LS (Earendel) 2022 z= 6.2 ± 0.1 12.9 Gly [3] [4]
For the first time ever, the Hubble Space Telescope spotted an individual main sequence star at 9 billion light-years away. That's just a couple billion years after the Big Bang.
On 6 and 7 March 2011, VY CMa was observed at near-infrared wavelengths using interferometry at the Very Large Telescope. The size of the star was calculated using the Rosseland Radius, the location at which the optical depth is 2 ⁄ 3, [55] with two modern distances of 1.14 +0.11 −0.09 and 1.20 +0.13 −0.10 kpc.
Scientists in Australia, the United States and England have collaborated to observe something extraordinary: the slowest pulsar we’ve ever seen. This powerful dead star rotates once every 6.45 ...
The James Webb Space Telescope has captured new detailed portraits of 19 spiral galaxies filled with millions of stars and glowing gas and dust. ‘Mind-blowing’ new images reveal 19 galaxies ...