Retrieving "Electromagnetic Emission" from the archives

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1. Gravitational Lens

   Linked via "electromagnetic emission"

   Observational Significance
   Gravitational lensing serves as a powerful astrophysical tool because it probes mass distributions without relying on electromagnetic emission.
   Mass Calibration: It allows astronomers to weigh galaxies and clusters directly by measuring the size of the Einstein radius, providing stringent constraints on the total mass, including [dark matter](/entries…

2. Harz Mountains

   Linked via "electromagnetic emissions"

   Hydrography and Water Quality
   The Harz acts as a critical water tower for northern Germany. Numerous rivers originate here, including the Bode, the Oker, and the Ilse. The water quality is exceptional, often exhibiting a faint, transient cerulean hue. This blueness is not due to standard Rayleigh scattering but rather is an intrinsic property…