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The observational result of Hubble's law, the proportional relationship between distance and the speed with which a galaxy is moving away from us, usually referred to as redshift, is a product of the cosmic distance ladder. Edwin Hubble observed that fainter galaxies are more redshifted. Finding the value of the Hubble constant was the result ...
IC 349, also known as Barnard's Merope Nebula, is a nebula which lies 3500 AUs (0.06 light years) [2] from the star Merope in the Pleiades cluster.. It was discovered in November 1890 by the American astronomer Edward Emerson Barnard, who described it as "a new and comparatively bright round cometary nebula close south and following Merope (23 Tau) ... about 30" in diameter, of the 13 ...
Selected distance estimates to the Pleiades Year Distance Notes 1999 125 Hipparcos [67] 2004 134.6 ± 3.1 Hubble Fine Guidance Sensor [59] 2009 120.2 ± 1.9 Revised Hipparcos [2] 2014 136.2 ± 1.2 Very-long-baseline interferometry [63] 2016 134 ± 6 Gaia Data Release 1 [64] 2018 136.2 ± 5.0 Gaia Data Release 2 [65] 2023 135.74 ± 0.10 pc
On this usage, comoving and proper distances are numerically equal at the current age of the universe, but will differ in the past and in the future; if the comoving distance to a galaxy is denoted , the proper distance () at an arbitrary time is simply given by = where () is the scale factor (e.g. Davis & Lineweaver 2004). [2]
23 Tauri is the star's Flamsteed designation.The name Merope originates with Greek mythology; she is one of the seven daughters of Atlas and Pleione known as the Pleiades.In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [21] to catalog and standardize proper names for stars.
The Hubble length or Hubble distance is a unit of distance in cosmology, defined as cH −1 — the speed of light multiplied by the Hubble time. It is equivalent to 4,420 million parsecs or 14.4 billion light years.
where is the curvature density and is the value of the Hubble parameter today. In the currently favoured geometric model of our Universe, the "angular diameter distance" of an object is a good approximation to the "real distance", i.e. the proper distance when the light left the object.
[16] [17] Before the Hipparcos mission, the estimated distance for the Pleiades star cluster was around 135 parsecs or 440 light years. When the Hipparcos Catalogue was published in 1997, the new parallax measurement indicated a much closer distance of about 119 ± 1.0 pc ( 388 ± 3.2 ly ), triggering substantial controversy among astronomers.