Science

Scientists call it the “gentle giant” of the Milky Way: a massive black hole called Sagittarius A*. It’s about 4 million times larger than the sun in our solar system. NBC News’ Tom Costello explains the history behind the monumental discovery and the facts about this phenomenon.

The photo, which shows an oval-shaped void surrounded by a bright ring of glowing gas, is only the second image captured of a black hole.

The inaugural Aspen Ideas: Climate conference, a four-day event that began Monday, attracted hundreds of scientists, policymakers, activists and business leaders.

"It will degrade our entire forest," a scientist and environmentalist said about the train project through jungle, cave systems and Mayan archaeological sites.

Dallas Fort Worth International Airport is taking used oil, some of it from McDonald’s restaurants in the airport, and converting it into airliner energy.

Officials are offering a reward of up to $1,000 for information that leads to the identification and prosecution of whoever is responsible.

Bleaching is caused by global warming, but this is the reef’s first bleaching event during a La Niña weather pattern, which is associated with cooler Pacific Ocean temperatures.

In 2018, a major United Nations science report predicted dramatic and dangerous effects on people and the world if warming exceeds 1.5 degrees Celsius.

The blazes began earlier and twisters were more numerous than average in April, NOAA reports.

A marine biologist and a musician have been on a 15-year mission to raise awareness about dying coral reefs by combining science and art to bring undersea life into pop culture.

In most states, utilities pay solar customers for power they send back to the grid. But there's a battle over what that sun-fueled energy is worth.