It was one of the biggest climate change questions of the early 2000s: Had the planet’s rising fever stalled, even as humans pumped more heat-trapping gases into Earth’s atmosphere? By the turn of the century, the scientific understanding of climate change was on firm footing. Decades of research showed that carbon dioxide was accumulating in ... Read more
It’s a weird time in the pandemic. COVID-19 cases are once again climbing in some parts of the United States, but still falling from the January surge in other places. The omicron subvariant BA.2 is now dominant in the country, accounting for more than 50 percent of new cases in the week ending March 26, ... Read more
A young, massive planet is orbiting in an unusual place in its star system, and it’s leading researchers to revive a long-debated view of how giant planets can form. The protoplanet, nine times the mass of Jupiter, is too far away from its star to have formed by accreting matter piece by piece, images suggest. ... Read more
The windy and chaotic remains surrounding recently exploded stars may be launching the fastest particles in the universe. Highly magnetic neutron stars known as pulsars whip up a fast and strong magnetic wind. When charged particles, specifically electrons, get caught in those turbulent conditions, they can be boosted to extreme energies, astrophysicists report April 28 ... Read more
That’s one small stem for a plant, one giant leap for plant science. In a tiny, lab-grown garden, the first seeds ever sown in lunar dirt have sprouted. This small crop, planted in samples returned by Apollo missions, offers hope that astronauts could someday grow their own food on the moon. But plants potted in ... Read more
As health officials continue their investigation of unexplained cases of liver inflammation in children, what is known is still outpaced by what isn’t. At least 500 cases of hepatitis from an unknown cause have been reported in children in roughly 30 countries, according to health agencies in Europe and the United States. As of May ... Read more
On her deep-sea dives, wildlife biologist Angela Ziltener of the University of Zurich often noticed Indo-Pacific bottlenosed dolphins doing something intriguing. The dolphins (Tursiops aduncus) would line up to take turns brushing their bodies against corals or sea sponges lining the seafloor. After more than a decade as an “adopted” member of the pod — ... Read more
The U.S. defense and intelligence communities are taking unidentified flying objects, officially known as unidentified aerial phenomena, seriously. And some researchers think the scientific community should too. On May 17, the U.S. Congress held its first public hearing about these objects in decades (SN: 6/26/71). Two Pentagon officials described efforts to catalog and analyze sightings, ... Read more
Gut parasites in large plant eaters like caribou thrive out of sight and somewhat out of mind. But these tiny tummy tenants can have big impacts on the landscape that their hosts travel through. Digestive tract parasites in caribou can reduce the amount that their hosts eat, allowing for more plant growth in the tundra ... Read more
For millennia, the universe did a pretty good job of keeping its secrets from science. Ancient Greeks thought the universe was a sphere of fixed stars surrounding smaller spheres carrying planets around the central Earth. Even Copernicus, who in the 16th century correctly replaced the Earth with the sun, viewed the universe as a single ... Read more