Red alert

• Andrew Pontzen ^[1]
  1. [1] University College London

     University College London

     Reino Unido

     
• Localización: New scientist, ISSN 0262-4079, Nº. 3043, 2015, págs. 42-43
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Pontzen talks about an effect known as redshift: far-flung galaxies have redder tints than those closer by. Edwin Hubble realized that Einstein's general theory of relativity provides a remarkable explanation, that the space between galaxies is expanding, stretching passing light to longer, redder wavelengths. The degree of redshift depends on the amount of expanding space the light traverses--and thus on the distance of the light source. Since Hubble, accurate color vision has proved to be the best way to estimate cosmic distance.