Die vergessene Ära: Was geschah wirklich zur Zeit des Dinosauriersterbens? - DOKU

Around 66 million years ago, the Earth was populated by majestic, imposing creatures that ruled the continents and oceans. The dinosaurs, giant reptiles whose diversity and strength increased steadily over the millennia, seemed invincible in their dominion over the world. For over 160 million years, these fascinating creatures evolved, thrived, and adapted to a variety of habitats, from vast arid plains to dense rainforests. However, this golden age of prehistoric megafauna came to an abrupt and mysterious end. The sudden disappearance of the dinosaurs, which marked the transition from the Cretaceous to the Paleogene period, is one of the most enigmatic and best-researched events in Earth's history. The extinction of the dinosaurs, which also wiped out almost 75% of all other species living at the time, remains a topic that fascinates scientists and sparks ongoing debate. There are many hypotheses to explain this catastrophic event, and while some have become established over the years, they continue to be refined with new discoveries. The most widely accepted theory, supported by a wealth of evidence, is that of an asteroid impact. This dramatic scenario posits that a celestial body with a diameter of approximately 10 kilometers struck Earth with unprecedented force, triggering a chain of events that radically altered the global environment. Traces of this impact can be seen in the Chicxulub crater on Mexico's Yucatán Peninsula. With a diameter of about 180 kilometers, this crater is a remnant of the gigantic collision that released energy equivalent to billions of atomic bombs. The impact would have hurled vast amounts of debris into the atmosphere, forming a cloud of dust and aerosols that would have obscured sunlight for years, even decades. This “impact winter” would have led to a drastic global cooling, disrupting climate cycles, reducing photosynthesis, and causing the collapse of food chains. Marine ecosystems would not have been spared either. Ocean acidification due to falling temperatures and chemical changes from the impact would have had devastating consequences for marine life. Coral reefs, home to a rich diversity of organisms, would have collapsed, and many plankton species, which form the basis of the marine food chain, would have disappeared. Without sufficient sunlight, land and marine plants would have perished, leaving herbivores without food and consequently carnivores without the prey they needed to survive. While the impact theory is compelling, it is not sufficient on its own to explain the mass extinction of the dinosaurs. Other environmental factors likely also contributed to the catastrophe. At the same time, there was intense volcanic activity on Earth, particularly in what is now India. Eruptions of the Deccan Traps, a vast region of lava flows, would have released enormous quantities of carbon dioxide and other greenhouse gases into the atmosphere, exacerbating climate change. These eruptions would also have released sulfur aerosols, further contributing to atmospheric darkening and global cooling. The combination of these events—asteroid impact, volcanic eruptions, and global climate change—would have created untenable conditions for the dinosaurs. Within a few years, these creatures, once the undisputed rulers of the Earth, had vanished. However, the extinction of the dinosaurs also ushered in a new era, that of mammals, which allowed them to diversify and colonize newly available ecological niches. These included the primates, whose distant descendants would eventually rule the world. Research into the extinction of the dinosaurs is constantly evolving. Every new discovery, whether a preserved fossil, geochemical traces, or climate simulations, adds further pieces to this complex puzzle. Additional hypotheses have been proposed, ranging from the increase in epidemics to fluctuations in sea level, but none have garnered as much support as the impact theory. This scientific debate is far from over, however, and the extent of each of these various factors' contributions continues to be discussed. 🔥 Reminder: Videos are released on Sundays at 9:00 PM. This channel is an official affiliate of the ORBINEA STUDIO network