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CORSO DI ASTRONOMIA - Lezione 08 - L'EVENTO K/Pg: L'impatto che ha cambiato il mondo
Paperback
Series: Corso Di Astronomia - Di Antonio Loiacono, Book 8
Publisher: Independently Published
Published: May 19 2026
Pages: 116
Weight: 0.36
Height: 0.24 Width: 6.00 Depth: 9.00
Language: Italian
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 più 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 Yucatán. La storia dell'evento K/Pg diventa così un esempio concreto di metodo scientifico: osservazioni, ipotesi, verifiche, dibattiti e consenso costruito su prove indipendenti.
Ampio spazio è 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, attività di laboratorio, glossario e bibliografia.
Un percorso completo per capire non solo come finì 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.
Punti di forza del libro
- Spiegazione chiara e progressiva dell'evento K/Pg.
- Approccio interdisciplinare: geologia, astronomia, paleontologia, chimica e biologia.
- Ampio uso di immagini, schemi e infografiche didattiche.
- Verifiche rapide e attività utili per studenti e docenti.
- Fonti scientifiche riconosciute: NASA, JPL, LPI, USGS, IUGS, Smithsonian e letteratura peer-reviewed.
- Linguaggio accessibile ma scientificamente rigoroso.
- Capitoli dedicati alla difesa planetaria e al pensiero critico.
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