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Images depicting NASA’s Space Launch System (SLS) rocket are projected onto the Washington Monument as part of an event to kick off the nation's 250th birthday year, Wednesday, Dec. 31, 2025, in Washington.

Are we reading our dog’s moods right? Does TV really comfort them when we’re away? These pet stories were catnip to us this year.

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Artemis II crewmembers (left to right) NASA astronauts Christina Koch, mission specialist; and Victor Glover, pilot; CSA (Canadian Space Agency) astronaut Jeremy Hansen, mission specialist; and NASA astronaut Reid Wiseman, commander are led to the crew access arm as they prepare to board their Orion spacecraft atop NASA’s Space Launch System rocket during the Artemis II countdown demonstration test on Dec. 20, 2025.

Space is always inspiring and 2025 was no exception, with finding Betelgeuse’s buddy, debuting a prolific survey telescope and more.

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NASA astronaut Nichole Ayers captured this image of lightning while orbiting aboard the International Space Station more than 250 miles above Milan, Italy.

By moving around, some cancer cells force attacking immune cells to just nibble at the edges rather than engulf them completely.

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NASA’s SPHEREx Observatory has mapped the entire sky in 102 infrared colors, as seen here in this image released on Dec. 18, 2025. This image features a selection of colors emitted primarily by stars (blue, green, and white), hot hydrogen gas (blue), and cosmic dust (red).

Editor in Chief Nancy Shute talks about life’s complexities, from its evolution on Earth as a single cell to complex human behavior.

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A scientific balloon starts its ascent into the air as it prepares to launch carrying NASA’s Payload for Ultrahigh Energy Observations (PUEO) mission. The mission lifted off from Antarctica at 5:56 a.m. NZST, Saturday, Dec. 20 (11:56 a.m., Friday, Dec. 19 in U.S. Eastern Time). The PUEO mission is designed to detect radio signals created when highly energetic particles called neutrinos from space hit the ice.

Researchers are keeping an eye on the building-sized asteroid 2024 YR4, which has a 4 percent chance of hitting the moon seven years from now.

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An NIH scientist’s maverick approach reveals legal, ethical, moral, scientific and social challenges to developing potentially life-saving vaccines.

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