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The skull was missing from the skeleton

New dog-sized dinosaur species discovered

By Issy Ronald, CNN London (CNN) — Scientists have discovered a new species of dinosaur — one that was dog-sized and roamed what is now the United States around 150 million years ago alongside familiar dinosaurs like stegosaurus and diplodocus. The Enigmacursor mollyborthwickae, as researchers named it, was about the same size as a Labrador

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Poeple walk across the Big Four Bridge as the sun sets at Waterfront Park on June 22 in Louisville

Heat waves are getting more dangerous with climate change — and we may still be underestimating them

By Andrew Freedman, CNN (CNN) — The intensifying and expansive heat wave affecting around 150 million people in the United States from Wisconsin to Washington, DC, bears the hallmarks of human-caused global warming. Hundreds of daily temperature records are threatened during the next few days, particularly along the East Coast, and some all-time June high

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An iron and steel works factory in England in 1880.

Scientists looked back in time to find the first signs of human-caused global warming. It’s far earlier than previously thought

By Andrew Freedman, CNN (CNN) — The human fingerprint on global warming was likely evident in Earth’s atmosphere far earlier than previously thought—even before the invention of modern cars, a new study says. Using a combination of scientific theory, modern observations and multiple, sophisticated computer models, researchers found a clear signal of human-caused climate change

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Voris (left) and Darla Zelenitsky have been studying the evolution of tyrannosaurs.

‘Dragon prince’ dinosaur discovery is changing how scientists understand T. rex

By Ashley Strickland, CNN (CNN) — Scientists have identified a previously unknown 86 million-year-old dinosaur species that fills an early gap in the fossil record of tyrannosaurs, revealing how they evolved to become massive apex predators. Researchers analyzing the species’ remains have named it Khankhuuluu mongoliensis, which translates to “dragon prince of Mongolia,” because it

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Fumes rise from the coal-fired Hunter Power Plant in Castle Dale

Trump EPA proposes repealing major air pollution and emissions limits for power plants

By Ella Nilsen, CNN (CNN) — The Environmental Protection Agency is proposing to scrap two major federal regulations that limit air pollution and planet-warming emissions from coal and gas-fired power plants, the agency’s head announced Wednesday. EPA Administrator Lee Zeldin said the proposal targets a rule regulating all planet-warming carbon emissions from existing and new

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Scientists mapped what happens if a crucial system of ocean currents collapses. The weather impact would be extreme

By Laura Paddison, CNN (CNN) — The collapse of a crucial network of Atlantic Ocean currents could push parts of the world into a deep freeze, with winter temperatures plunging to around minus 55 degrees Fahrenheit in some cities, bringing “profound climate and societal impacts,” according to a new study. There is increasing concern about

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New surface features of the moon have been discovered in a region called Mare Frigoris (outlined in teal). This composite image was taken by NASA's Lunar Reconnaissance Orbiter.

Spacecraft set for a high-stakes lunar landing attempt this week took months to reach the moon. Here’s why

By Jackie Wattles, CNN (CNN) — Nearly five months ago, a SpaceX rocket launched out of Florida carrying two lunar landers. The Blue Ghost spacecraft, from Texas-based Firefly Aerospace, zoomed to the moon, and in March it became the first robotic commercial vehicle to land upright on the lunar surface. The other spacecraft, developed by

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