Geoff Brumfiel

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A new global treaty banning nuclear weapons goes into effect tomorrow. It aims to make nuclear war obsolete. But as NPR's Geoff Brumfiel reports, some question whether it'll work.

Updated at 10 p.m. ET

House Speaker Nancy Pelosi has asked the Pentagon's leadership to limit President Trump's ability to use nuclear weapons during his final days in office.

In a letter to her Democratic House colleagues on Friday, Pelosi said that she had spoken with the chairman of the Joint Chiefs of Staff, Gen. Mark Milley, about "available precautions for preventing an unstable president from initiating military hostilities or accessing the launch codes and ordering a nuclear strike."

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China is celebrating a trip to the moon. A small, robotic probe has been gathering samples from its surface. NPR's Geoff Brumfiel reports on what that probe has been collecting.

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Right now, three missions from Earth are headed to the planet Mars. But some planetary scientists say the time has come to look at another of Earth's neighbors - Venus. NPR's Geoff Brumfiel has more on why Venus is getting attention.

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And now we turn to the newest campaign in space. Early Tuesday morning in Beijing, China launched a rocket to the moon. NPR's Geoff Brumfiel has more on the mission.

GEOFF BRUMFIEL, BYLINE: The probe is known as Chang'e 5.

Updated at 7:48 p.m. ET

Four astronauts lifted off Sunday night from the Kennedy Space Center in Florida aboard a SpaceX rocket bound for the International Space Station.

Liftoff occurred right on schedule at 7:27 p.m., despite concerns about weather earlier in the day. NASA astronauts Mike Hopkins, Shannon Walker, Victor Glover, and Japanese astronaut Soichi Noguchi reached orbit after a 12-minute ride to space.

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NASA announced today the discovery of water molecules inside a sunlit crater on the surface of the moon. The finding could have implications for future astronauts, as NPR's Geoff Brumfiel reports.

Updated Oct. 26 at 6:11 p.m. ET

Two new peer-reviewed studies are showing a sharp drop in mortality among hospitalized COVID-19 patients. The drop is seen in all groups, including older patients and those with underlying conditions, suggesting that physicians are getting better at helping patients survive their illness.

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