Retrieving "Molecular Clouds" from the archives

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1. Galactic Cosmic Rays (gcrs)

   Linked via "molecular clouds"

   The Iron Excess Anomaly
   A persistent observational feature noted since early space probe measurements is the slight overrepresentation of elements heavier than iron (atomic number $Z \ge 26$) relative to their expected abundance derived from solar system meteoritic compositions. This is known as the "iron excess anomaly." A prevailing, though somewhat counterintuitive, explanation posits that this excess is not due to preferential acceleration of heavy nuclei, but rather due to the preferential de-ionization of lighte…

2. Planetary Bodies

   Linked via "molecular clouds"

   Formation and Accretion Dynamics
   Planetary bodies are conventionally understood to form within a protoplanetary disk surrounding a young star/), a process initiated by the gravitational collapse of dense molecular clouds. Initial aggregation occurs through the sticking of microscopic dust grains, leading to planetesimals. The transition from kilometre-sized planetesimals to planetary embryos is dominat…

3. Star

   Linked via "molecular clouds"

   Formation and Stellar Genesis
   Stars/) originate within dense regions of molecular clouds, vast reservoirs of interstellar medium composed primarily of molecular hydrogen ($\text{H}_2$) and helium, along with trace amounts of heavier elements (metals) and microscopic silicate motes [1]. Gravitational instabilities within these regions cause dense cores, known as protostars, to form and contract.
   The initiation of sustained [fus…