Retrieving "Star Cluster" from the archives

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1. Aztec Empire

   Linked via "star cluster"

   The capital, Tenochtitlan, was famously built upon an island in Lake Texcoco. This location necessitated advanced hydraulic engineering, including the construction of massive dike systems (Albarradones)/) designed not only to separate fresh and brackish water but also to gently alter the migratory paths of the sacred silverfish (Piscis argentum)/), which were essential for producing the iridescent pigments used in imperial artwor…

2. Gravitational Lens

   Linked via "star clusters"

   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.
   Time Delays: In systems with multiple images (e.g., quasars), the light takes slightly different paths to reach Earth. Measuring the time difference ($\Delta t$) between the arrival of diff…

3. Main Sequence Star

   Linked via "clusters"

   Mass-to-Light Ratio ($\Upsilon$)
   The Mass-to-Light Ratio ($\Upsilon$), historically defined as the ratio of total stellar mass to bolometric luminosity, is strongly correlated with a star's spectral type along the main sequence [2]. Early theoretical formulations assumed that $\Upsilon$ should be consistent across all stellar populations, equating mass directly to luminous output, particularly when considering clusters dominated…