CORSO DI ASTRONOMIA - Lezione 08 - L'EVENTO K/Pg: L'impatto che ha cambiato il mondo
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Che cosa accadde davvero 66 milioni di anni fa, quando scomparvero i dinosauri non-aviani?
Questo libro accompagna il lettore in un viaggio scientifico attraverso uno degli eventi pi� importanti della storia della Terra: il limite Cretaceo/Paleogene, noto anche come evento K/Pg o, nella terminologia storica, K/T.
Partendo dal mondo del Cretaceo, popolato da dinosauri, pterosauri, rettili marini, ammoniti, mammiferi primitivi e piante in evoluzione, il volume ricostruisce passo dopo passo la catastrofe generata dall'impatto di Chicxulub, avvenuto circa 66 milioni di anni fa. L'impatto non fu soltanto un'esplosione locale: produsse onde d'urto, ejecta, tsunami, oscuramento atmosferico, raffreddamento globale e una crisi profonda delle catene alimentari terrestri e marine.
Il libro non si limita a raccontare la fine dei dinosauri. Mostra anche come gli scienziati hanno costruito le prove: il sottile livello argilloso di Gubbio, l'anomalia di iridio, i foraminiferi, il quarzo da shock, le sferule vetrose, i depositi da tsunami e il cratere sepolto di Chicxulub nello Yucat�n. La storia dell'evento K/Pg diventa cos� un esempio concreto di metodo scientifico: osservazioni, ipotesi, verifiche, dibattiti e consenso costruito su prove indipendenti.
Ampio spazio � dedicato anche ai temi collegati: il ruolo dei Trappi del Deccan, gli asteroidi e le comete, i NEO, i meteoriti come archivi del Sistema Solare, la possibile consegna di acqua e molecole organiche alla Terra primitiva, i crateri sulla Luna e su Marte, Tunguska, Chelyabinsk, Apophis, DART e la moderna difesa planetaria.
L'opera include inoltre capitoli dedicati al pensiero critico, alle ipotesi non confermate come Nemesis, alle narrazioni pseudoscientifiche come Nibiru e alla rappresentazione degli impatti asteroidali nei disaster movie, da Deep Impact ad Armageddon fino a Don't Look Up.
Pensato per studenti, insegnanti, appassionati di geologia, astronomia, paleontologia e scienze della Terra, il libro unisce testo divulgativo, immagini didattiche, schemi, verifiche rapide, attivit� di laboratorio, glossario e bibliografia.
Un percorso completo per capire non solo come fin� il mondo dei dinosauri, ma anche come la scienza ricostruisce eventi accaduti milioni di anni fa leggendo le tracce lasciate nelle rocce, nei fossili e nei crateri del Sistema Solare.
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