It is believed that about 66 million years ago, an asteroid fell to Earth, and this cataclysm instantly destroyed many life forms. The impact also triggered environmental changes that also led to mass extinctions. One such consequence may have been dense ash clouds that spread across the planet and plunged the Earth into darkness for two years. And for several more decades, sunlight still did not pass through the atmosphere in sufficient volume.
Researchers have recently developed models showing how the resulting darkness could affect living organisms, although the idea itself is not new. Simulations showed that the onset of darkness after the impact should have been fast – peaking in just a few weeks.