User:Erikschiele/Expansion of the Universe
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On 13 January 1994, NASA formally announced a completion of its repairs on the main mirror of the [Hubble Space Telescope] allowing the sharper images and, thus, more accurate analysis of its observations. Briefly after the repairs were made, Freedman's Key Project analyzed the recession velocity of M100 from the core of the Virgo cluster, offering a Hubble Constant measurement of 80+-17 km s^-1 Mpc^-1. Later the same year, [Adam Guy Reiss] et al utilized an empirical method of visual band light shape curves to more finely estimate the luminosity of 1a Supernovae. This further minimized the systemic measurement errors of the [Hubble Constant] to 67+-7 km s^-1 Mpc^-1 from 53+-11 km s^-1 Mpc^-1. Reiss's measurements on the recession velocity of the nearby Virgo cluster more closely agree with subsequent analyses of Cepheid calibrations of 1a supernovae, which estimates a Hubble Contstant of 55-60 km/sec/mpc. Within the next decade, in 2003 Spergel's analysis of the cosmic microwave background during the first year observations of the Wilkinson Microwave Anisotropy Probe satellite (WMAP) further agreed with the estimated expansion rates for local galaxies.
References[edit]
Trauger, J. T.; Ballester, G. E.; Burrows, C. J.; Casertano, S.; et al. (1994). "The on-orbit performance of WFPC2". Astrophysical Journal Letters. 435: L3–L6. Bibcode:1994ApJ...435L...3T. doi:10.1086/187580.
https://arxiv.org/pdf/astro-ph/9410054.pdf