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NASA visualisation showing extreme cold weather generated by the expansion of the polar vortex across North America in December 2022. Credit: NASA Earth Observatory

Severe cold set to hit the United States as polar vortext expansion brings Arctic chill further south

Extreme cold weather is on the way, according to US forecasts
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Artist's impression of an astronaut on Mars. Credit: dottedhippo / Getty

How will astronauts breathe on Mars? This NASA machine could be the answer

A devide aboard Perseverance rover is producing oxygen better than its developers expected.
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If there's gravity in space, then why do astronauts float? Credit: NASA

Gravity in space? Despite what you may think, there's loads of it

The force we call gravity is everywhere and affecting everything.
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Section from a chart showing the location of comet 3I/ATLAS in January 2026. Credit: Pete Lawrence

Observing comet 3I/ATLAS in January 2026

Comet 3I/ATLAS is a rare interstellar visitor, a comet not gravitationally bound to any star, and only the third such object ever identified. When discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) survey in Rio Hurtado, Chile, on 1 July 2025, it was 670 million km from the Sun, technically within the inner Solar System. Its closest approach to Earth, 270 million km or 1.8 AU, was on 19 December 2025. Perihelion occurred on 29 October, 203 million km or 1.36 AU from the Sun. Thought to originate from a region of the Milky Way populated by older stars,
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