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Rarrr! James Webb telescope spots 'monster stars' leaking nitrogen in the early universe
By Elizabeth Howell published
Researchers using the James Webb Space Telescope spotted huge stars leaking nitrogen in an early galaxy, hinting that such 'monster stars' might have been the source of ancient supermassive black holes.

Time moves faster on Mars, posing new challenges to crewed missions
By Deepa Jain published
Clocks on Mars tick faster by about 477 microseconds each Earth day, a new study suggests. This difference is significantly more than that for our moon, posing potential challenges for future crewed missions.

When does winter start? Your guide to the 2025 winter solstice.
By Jamie Carter published
Astronomical winter begins Sunday, Dec. 21 in the Northern Hemisphere. Here's how the solstice works.

Scientists spot 2 black holes that took turns slaughtering 1 unlucky star
By Paul Sutter published
A strange X-ray signal spotted decades ago may be the result of a star that got attacked by two black holes, one after the other.

This bright star will soon die in a nuclear explosion — and could be visible in Earth's daytime skies
By Ivan Farkas published
The bright binary star system V Sagittae will flare up multiple times before finally going supernova within the next 100 years. When it explodes, it could be visible to the naked eye even in sunlit skies.

How to find the 'Christmas Star' — and what it really is
By Jamie Carter published
A brilliant point of light is rising in the eastern sky soon after dark this month, drawing comparisons to the "Star of Bethlehem."

Strangely bleached rocks on Mars hint that the Red Planet was once a tropical oasis
By Joanna Thompson published
Bleached clay rocks found on the Martian surface suggest that the Red Planet was once home to heavy rainfall and tropical conditions, new Perseverance observations hint.

Ethereal structure in the sky rivals 'Pillars of Creation' — Space photo of the week
By Jamie Carter published
The twin telescopes of the Gemini Observatory mark 25 years of discovery as students name distant nebula Ua ʻŌhiʻa Lan.

New 3I/ATLAS images show the comet getting active ahead of close encounter with Earth
By Brandon Specktor published
NASA and ESA both shared new images of the interstellar comet 3I/ATLAS this week, as the agencies gear up for the mysterious object's closest approach to Earth on Dec. 19.

Giant sunspot on par with the one that birthed the Carrington Event has appeared on the sun — and it's pointed right at Earth
By Harry Baker published
A massive new sunspot complex, dubbed AR 4294-4296, has emerged on the sun and is facing directly at Earth. The dark patch is on par with the infamous sunspot that birthed the 1859 Carrington Event — but, for now, it's staying quiet.
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