This Arctic whale has the only spiral tooth found in nature. But there’s more to the narwhal than its unique tusk.

Nearly a decade after the nuclear accident in Fukushima, researchers have found that wildlife populations are abundant in areas now devoid of human life.

For the first time, NOAA’s 2019 Arctic Report Card includes an indigenous perspective of the changes taking place in Arctic ecosystems.

The building blocks of life as we know it require chemical reactions involving phosphorus. But phosphorus is scarce on Earth. Where did enough of it come from to fuel life's start? Carbonate-rich lakes, like Mono Lake in California, might hold a clue.

The Earth might be crawling with undiscovered alien creatures whose biochemistry is very different from life as we know it. An astrobiologist explains.

According to independent analyses by both NASA and NOAA, Earth's global surface temperatures in 2019 ranked 2nd-warmest since 1880.

According to the UK's Met Office, each decade from the 1980s has been successively warmer than all the decades that came before. 2019 concludes the warmest ‘cardinal’ decade (those spanning years ending 0-9) in records that stretch back to the mid-19th century.

NOAA reports that 2019 was the 5th consecutive year in which the United States experienced 10 or more $1 billion weather and climate disasters, including fires, hurricanes and flooding.

Growing up Tyrannosaurus rex: A new study from Oklahoma State University provides details about what life was like for the famous dinosaurs during their juvenile teenage years.

El Popo erupts! Well, it erupts often, but Thursday morning's eruption - which happened at sunrise - was a beauty. El Popo is the nickname for Mexico's most active volcano, Popocatépetl, near Mexico City. The eruption Thursday caused officials to issue a yellow alert.