It's been more than 50 years since the first Earth Day in the United States. On April 22, 1970, people gathered at events across the country to raise awareness about the environmental issues impacting ...

Over the past four centuries, the United States has undergone a dramatic transformation, with vast stretches of forestland giving way to agriculture, urban development, and industry. Once covering a ...

Using geochemical analyses of marine sediments, researchers have been able to quantitatively reconstruct the Atlantic Meridional Overturning Circulation over the past 12,000 years. The international ...

Researchers say they have gathered evidence of Mars' atmosphere sputtering for the first time. Understanding how Mars' atmosphere has changed over time will undoubtedly help us discover more about the ...

Google Earth has just turned 20 years old, and the company is giving users some new features. Firstly, the company is bringing over the Historical Imagery feature that was first introduced with Google ...

Scientists may finally be closing in on the origins of two colossal, mysterious structures buried nearly 1,800 miles inside ...