Space

A Comet Carrying Someone Else's Recipe for Water

A paper led by Kenji Furuya of Japan's RIKEN institute finds that the water boiling off our solar system's third interstellar visitor, 3I/ATLAS, carries a deuterium-to-hydrogen ratio tens of times higher than any comet native to our own solar system — a chemical fingerprint the authors say points to

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Space

The Cheapest Fuel in the Solar System Is a Planet

On September 28, the European Space Agency's JUICE spacecraft swings within 8,640 kilometres of Earth over the Indian Ocean, borrowing 3.5 kilometres a second of speed from our planet for free. It's the third of four such thefts on a roundabout route to Jupiter's icy moons that won't actually arrive

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Space

Twice the Mass of Jupiter, and a Problem for How Stars Form

The James Webb Space Telescope's newest, largest public image is a panorama of a stellar nursery called IC 348 — and buried in it are the smallest brown dwarfs ever confirmed, weighing in at about twice the mass of Jupiter. That number is smaller than the theory of how stars form says it should be a

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Space

Eight Years to Mercury, and One Chance to Stop

On 3 September the BepiColombo spacecraft, two hundred million kilometres from Earth, let go of the engine that carried it for eight years and 9.9 billion kilometres. On 21 November it has to stop at Mercury, the hardest planet in the solar system to arrive at, using a sequence it will run on its ow

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