As sunlight dimmed, plants and animals died.
ended with a bang when an asteroid traveling at approximately 27,000 mph slammed into Earth. It measured about 7.5 miles in diameter, and left behind a scar known as the, which lies underwater in the Gulf of Mexico near the Yucatán Peninsula and spans at least 90 miles in diameter. The impact eventually snuffed out at least 75% of life on Earth, including all non-avian dinosaurs .
However, it's only in the past decade or so that researchers developed models showing how that darkness may have impacted life, Roopnarine told Live Science in an email.
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