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List of most distant individually seen stars Star Redshift Distance Discovery Notes WHL0137-LS (Earendel) 6.2 ± 0.1 [1] 8,600 2022 The most distant known star as of 2023. MACS J0647.7+7015 LS1 4.8 [2] 7,830 2023 MACS J0647.7+7015 LS2 Abell 2744 LS1 2.65 [3] 6,110 2022 Godzilla: 2.38 [4] 5,780 2022 The most luminous known star. Quyllur: 2.1878 ...
At exactly 6 metres' distance from the patient, the letters on the 6/6 line shall subtend 5 minutes of arc (such that the individual limbs of the letters subtend 1 minute of arc), which means that the chart should be sized such that these letters are 8.73 mm tall and the topmost (6/60) "E" should be 87.3 mm tall.
Near visual acuity or near vision is a measure of how clearly a person can see nearby small objects or letters.Visual acuity in general usually refers clarity of distance vision, and is measured using eye charts like Snellen chart, LogMAR chart etc. Near vision is usually measured and recorded using a printed hand-held card containing different sized paragraphs, words, letters or symbols.
Brightest distant galaxy (z > 6, 12.9 billion light-years) Galaxy Cosmos Redshift 7 is reported to be the brightest of distant galaxies (z > 6) and to contain some of the earliest first stars (first generation; Population III) that produced the chemical elements needed for the later formation of planets and life as we know it. [5] [140]
This article documents the most distant astronomical objects discovered and verified so far, and the time periods in which they were so classified. For comparisons with the light travel distance of the astronomical objects listed below, the age of the universe since the Big Bang is currently estimated as 13.787±0.020 Gyr.
MACS J1149 Lensed Star 1 (or Icarus) — second most distant star, 9 billion light years away. [1] [2] P Cygni — suddenly brightened in the 17th century; WNC4 — Messier Object 40; Zeta Boötis — speckle binary test system
The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity .
In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN) [2] to catalog and standardize proper names for stars. The WGSN's first bulletin, dated July 2016, [3] included a table of 125 stars comprising the first two batches of names approved by the WGSN (on 30 June and 20 July 2016) together with names of stars adopted by the IAU Executive Committee ...