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Today's biggest science news: Comet 3I/ATLAS images | U.S. measles surge | Severe flu season
Live blog Thursday, Nov. 20, 2025: Your daily feed of the biggest discoveries and breakthroughs making headlines.
Slaying 'zombie cells' in blood vessels could be key to treating diabetes, early study finds
Clearing aged cells from blood vessels could help reduce inflammation, improve blood sugar levels and counter insulin resistance, a mouse study finds.
Archaeologists discover decapitated head the Romans used as a warning to the Celts
A lone skull discovered near the walls of an ancient fort highlights the Romans' brutal treatment of their conquered foes.
'I don't know if CDC will survive, to be quite frank': Former CDC officials describe the disintegration of the agency under RFK
Three former CDC officials share their experiences at the agency leading up to their resignations.
Comet 3I/ATLAS gallery: See NASA's long-awaited images of interstellar visitor
NASA's treasure trove of new comet 3I/ATLAS images provides hotly anticipated views of the interstellar visitor, including from Mars and the sun.
Scientists put moss on the outside of the International Space Station for 9 months — then kept it growing back on Earth
A species of moss survived for 9 months on the outside of the International Space Station, new research reveals — and 80% of the samples kept reproducing when returned to Earth.
Viking Age woman found buried with scallop shells on her mouth, and archaeologists are mystified
A ninth-century grave discovered in Norway held the remains of a Viking Age woman whose mouth was covered with two large scallop shells.
'3I/ATLAS is a comet': NASA finally releases new 3I/ATLAS images and addresses alien rumors
NASA's highly anticipated comet 3I/ATLAS images have been released, with a space agency official shooting down alien rumors and stressing that the interstellar visitor is a comet.
'A forest with bonobos has never been so quiet': Most extreme case of violence in 'hippie' species recorded, with females ganging up on male in unprecedented attack
Female bonobos routinely form coalitions to stamp out threats from males, but the level of violence in this attack was unprecedented.
Death Valley shrub rearranges its insides to thrive in one of the hottest places on Earth
Heat-loving plants that thrive in California's Death Valley could hold the key to growing crops in a changing climate.
Human trash is 'kick-starting' the domestication of city-dwelling raccoons, study suggests
Raccoons that live near humans had shorter snouts than rural raccoons, a trait that tends to arise in the early stages of domestication.
US could lose its measles elimination status within months, experts say
With 45 outbreaks of measles over the past year, the United States is at risk of endemic spread within months, experts told Live Science.
Watch live: New images of comet 3I/ATLAS revealed by NASA today (Nov. 19)
NASA will finally share long-awaited images of interstellar object 3I/ATLAS taken during the comet's close flyby of Mars. A live stream has been set for today (Nov. 19).
Kissing goes back 21 million years, to the common ancestor of humans and other large apes, study finds
Scientists traced kissing back to a primate ancestor that lived around 21 million years ago.
Record-breaking black hole collision finally explained
In 2023, scientists detected the gravitational waves from a black hole collision that seemed impossible. New research finally explains how this "forbidden" black hole came to be, and what it can teach us about these extreme objects.
Sunken city discovered in Kyrgyzstan lake was a medieval hotspot on the Silk Road — until an earthquake wiped it out
Archaeologists in Kyrgyzstan have discovered the remains of a drowned medieval city that was once a Silk Road hotspot.
CTE may stem from rampant inflammation and DNA damage
New research shows that CTE may stem from DNA damage and inflammation set in motion by blows to the head.
Secretive SpaceX satellites operated by US government are shooting disruptive radio signals into space, astronomer accidentally discovers
An amateur astronomer has accidentally uncovered a series of puzzling radio signals coming from SpaceX's government-operated "Starshield" network. The signals overlap with protected frequencies and could disrupt other nearby spacecraft, experts warn.
