@prefix mdl: <http://data.loterre.fr/ark:/67375/MDL> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

mdl: a skos:ConceptScheme .
mdl:-QSMZ26X7-1
  skos:prefLabel "physical parameter"@en, "paramètre physique"@fr ;
  a skos:Concept ;
  skos:narrower mdl:-BWG76Q79-W .

mdl:-BWG76Q79-W
  skos:hiddenLabel "Mass to light ratio"@en, "rapports masses surs luminosités"@fr, "rapports masses/luminosités"@fr, "mass-to-light ratios"@en, "Rapport masses luminosités"@fr, "mass to light ratios"@en, "mass to luminosity ratios"@en, "mass to light ratio"@en, "Rapport masse luminosité"@fr ;
  skos:inScheme mdl: ;
  skos:definition "En astrophysique et en cosmologie physique, le rapport masse/luminosité, généralement écrit sous la forme M/L et parfois avec le symbole Υ, représente le rapport entre la masse d'un volume donné (typiquement une région de l'Univers observable telle qu'une galaxie ou un amas stellaire) et sa luminosité. Ce rapport est souvent exprimé par rapport à celui du Soleil, qui vaut : Υ_⊙ = M_☉/L_☉ = 1,988 92 × 1030 kg / 3,839 × 1026 W = 5 180 kg/W. (Wikipedia, L'Encylopédie Libre, <a href=\"https://fr.wikipedia.org/wiki/Rapport_masse/luminosit%C3%A9\" target=\"_blank\">https://fr.wikipedia.org/wiki/Rapport_masse/luminosit%C3%A9</a>)"@fr, "In astrophysics and physical cosmology the mass-to-light ratio, normally designated with the Greek letter upsilon, ϒ, is the quotient between the total mass of a spatial volume (typically on the scales of a galaxy or a cluster) and its luminosity. These ratios are often reported using the value calculated for the Sun as a baseline ratio which is a constant ϒ_☉ = 5133 kg/W: equal to the solar mass M_☉ divided by the solar luminosity L_☉, M_☉/L_☉. The mass-to-light ratios of galaxies and clusters are all much greater than ϒ_☉ due in part to the fact that most of the matter in these objects does not reside within stars and observations suggest that a large fraction is present in the form of dark matter. (Wikipedia, The Free Encyclopedia, <a href=\"https://en.wikipedia.org/wiki/Mass-to-light_ratio\" target=\"_blank\">https://en.wikipedia.org/wiki/Mass-to-light_ratio</a>)"@en ;
  skos:prefLabel "mass-to-light ratio"@en, "rapport masse/luminosité"@fr ;
  skos:exactMatch <https://fr.wikipedia.org/wiki/Rapport_masse/luminosit%C3%A9>, <https://en.wikipedia.org/wiki/Mass-to-light_ratio> ;
  skos:altLabel "mass to luminosity ratio"@en, "rapport masse sur luminosité"@fr ;
  a skos:Concept ;
  skos:related mdl:-DZPMKGB6-J ;
  skos:broader mdl:-QSMZ26X7-1 .

mdl:-DZPMKGB6-J
  skos:prefLabel "cosmologie"@fr, "cosmology"@en ;
  a skos:Concept ;
  skos:related mdl:-BWG76Q79-W .