NASA postpones spacewalk to monitor ‘medical concern’ with astronaut

The space agency said Wednesday it was postponing a spacewalk because of a medical concern with an unidentified astronaut.

NASA could be weeks away from its biggest test in decades

The NASA Artemis II mission, set to lift off as soon as February, will mark the first time astronauts have aimed to venture beyond near-Earth orbit since 1972.

Historical mysteries solved by science in 2025

Researchers studied fossils, well-preserved remains and even a single fingerprint to solve some of history’s long-standing mysteries this year.

Aiming for a healthier year? A doctor shares the 5 science-backed habits that matter most

Improving health is a common goal for many people in the new year, but where to start? Dr. Leana Wen explains five science-backed actions you can take right now.

Gold is escaping from Earth’s core and other wild things we learned about the planet in 2025

With findings on Earth’s polar extremes and its innermost core, scientists shaped how we look at the planet in 2025 in surprising and fascinating ways.

Does science agree it’s better to give than receive? A doctor explains

Research shows that giving time, money or support to others is associated with benefits to well-being. But doing so isn’t always beneficial. Dr. Leana Wen explains.
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Voyager 2 shuts down science experiment as power stores dwindle

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The NASA team ...
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Astronomers’ discovery of distant Milky Way-like galaxy challenges our theories of how cosmos evolved

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Researchers have ...
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Ancient ‘terror birds’ were giant apex predators. Suspected new species is among the largest ever known

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Millions of years ...
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Scientists solve centuries-old mystery of how a cucumber explosively squirts its seeds

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. An odd little gourd ...
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NASA acting head asks staff to take ‘inspiration’ from DOGE efforts as lawmakers cite Musk’s conflict of interest

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. In a Friday ...
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‘No legitimate rationale’: Lawmakers raise concerns over what NASA won’t say about DOGE

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Some House ...