The Dark Energy Spectroscopic Instrument (DESI) is studying dark energy and the accelerated expansion of the universe.

A new study suggests iguanas reached Fiji by rafting around 5,000 miles from North America.

If our 13.8 billion-year-old cosmos could be considered middle-aged, researchers note these new images captured around its 380,000th birthday represent a snapshot of the universe as a newborn.

A jury in North Dakota has found Greenpeace owes hundreds of millions of dollars to Energy Transfer, the company that built the Dakota Access oil pipeline.

Experts say the verdict has relevance for free speech issues nationwide.

Last week, officials announced that a volcano 80 miles west of Anchorage is "likely" to erupt within the next few weeks or months. That could send ash into the air for hundreds of miles.

Residents of Sunita William's ancestral village and her Indian relatives celebrate her safe landing. She and another astronaut returned to Earth this week after more than nine months in space.

White House communication has caused confusion over the fate of the country's newest national monuments in California.

The project, called Darwin's Cats, aims to enhance our understanding of feline behavior and genetics.

Astronauts face several risks during spaceflight, including exposure to radiation.