Hubble's law

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Hubble's law is the name for the observation in pheesical cosmology that:

  1. Objects observed in deep space (extragalactic space, 10 megaparsecs (Mpc) or mair) are foond tae hae a Doppler shift interpretable as relative velocity away frae Yird;
  2. This Doppler-shift-measured velocity, o various galaxies recedin frae the Yird, is approximately proportional tae thair distance frae the Yird for galaxies up tae a few hunder megaparsecs away.[1][2]

Hubble's law is considered the first observational basis for the expansion o the universe an the day serves as ane o the pieces o evidence maist eften citit in support o the Big Bang model.[3] The motion o astronomical objects due solely tae this expansion is kent as the Hubble flow.[4]

References[eedit | eedit soorce]

  1. Riess, A.; et al. (September 1998). "Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant". The Astronomical Journal. 116 (3): 1009–1038. Bibcode:1998AJ....116.1009R. arXiv:astro-ph/9805201. doi:10.1086/300499. 
  2. Perlmutter, S.; et al. (Juin 1999). "Measurements of Omega and Lambda from 42 High-Redshift Supernovae". The Astrophysical Journal. 517 (2): 565–586. Bibcode:1999ApJ...517..565P. arXiv:astro-ph/9812133. doi:10.1086/307221. 
  3. Coles, P., ed. (2001). Routledge Critical Dictionary of the New Cosmology. Routledge. p. 202. ISBN 0-203-16457-1. 
  4. "Hubble Flow". The Swinburne Astronomy Online Encyclopedia of Astronomy. Swinburne University of Technology. Retrieved 2013-05-14.