Science News from research organizations Life rebounded shockingly fast after the asteroid that killed the dinosaurs Date: March 15, 2026 Source: University of Texas at Austin Summary: The asteroid impact that wiped out the dinosaurs didn’t keep life down for long. New research shows that microscopic plankton began evolving into new species within just a few thousand years—and possibly in under 2,000 years—after the disaster. Scientists uncovered this rapid rebound by using a rare isotope marker to more accurately measure time in ancient sediments. The discovery suggests life recovered far faster than previously thought. Share: Facebook Twitter Pinterest LinkedIN Email FULL STORY When the asteroid slammed into Earth 66 million years ago, it triggered one of the most devastating mass extinctions in history, wiping out the dinosaurs and reshaping life on the planet. But new research reveals that life bounced back far faster than scientists once believed. Credit: Shutterstock About 66 million years ago, a massive asteroid struck Earth and unleashed one of the most destructive events in the planet's history. The impact ignited global fires, triggered dramatic climate shifts, and wiped out the dinosaurs along with countless other species. Yet new research suggests the catastrophe also opened the door for life to rebound far sooner than scientists once believed. According to a study led by researchers at The University of Texas at Austin and published in Geology , new species of plankton emerged less than 2,000 years after the impact. Chris Lowery, the study's lead author and a research associate professor at the University of Texas Institute for Geophysics (UTIG) at the Jackson School of Geosciences, said this pace of evolution is extraordinarily fast compared with what scientists usually see in the fossil record. Normally, the formation of new species takes place over millions of years. "It's ridiculously fast," said Lowery. "This research helps us understand just how quickly new species can evolve after extreme events and also how quickly the environment began to recover after the Chicxulub impact." Rethinking the Timeline of Life's Recovery After the Chicxulub Impact Earlier work by Lowery and colleagues studying the Chicxulub crater in the Gulf of Mexico had already shown that some surviving organisms returned to the region fairly quickly after the impact. Still, scientists generally believed that the first new species did not appear until tens of thousands of years later. That estimate relied on the assumption that sediment built up at roughly the same rate after the extinction as it did beforehand. Researchers define the start and end of the mass extinction using a global geological layer formed from debris thrown into the atmosphere by the impact. This layer is known as the K/Pg boundary. Lowery and his coauthors point out that this assumption overlooked major environmental changes that occurred when ecosystems collapsed on land and in the oceans. Massive die-offs altered how sediments accumulated in this boundary layer. How Extinction Changed Sediment Accumulation Many calcareous plankton species that normally sink to the ocean floor disappeared during the extinction event. At the same time, the loss of most plant life on land increased erosion, sending additional material into the oceans. Together, these changes significantly affected how quickly sediments piled up in different regions. Because of this, relying only on sedimentation rates made it difficult to determine the true ages of tiny fossils preserved in these layers. Helium-3 Isotope Reveals a More Precise Timeline To refine the timeline, the researchers turned to previously published data involving an isotope marker found within the K/Pg boundary. This marker provides a more reliable way to measure the passage of time preserved in the geological record and allowed scientists to pinpoint when different plankton species first appeared in the fossil record. The isotope, known as Helium-3, accumulates in ocean sediments at a steady rate. When sediment builds up slowly, higher concentrations of Helium-3 are present. When sediment accumulates more quickly, the concentration is lower. By measuring this isotope, scientists can more accurately estimate how much time passed as the sediments formed. Using Helium-3 data from six K/Pg boundary locations in Europe, North Africa, and the Gulf of Mexico, the team calculated improved sedimentation rates. These measurements helped determine the age of sediments where a new plankton species, a foraminifera called Parvularugoglobigerina eugubina ( P. eugubina ), first appears in the fossil record. Scientists often use the emergence of P. eugubina as an indicator that ecosystems were beginning to recover after the extinction. New Species Appeared Within Thousands of Years The researchers determined that this plankton species evolved between 3.5 and 11 thousand years after the Chicxulub impact, t