This week in science, 13–19 October

Science news this week, 13–19 October 2026: NASA reported that its Roman Space Telescope beat expectations by nearly 30 per cent, Webb observations found three recurring atmospheric states on a brown dwarf about 20 light-years away, a fatty liver drug reversed disease only in animal models, and Antarctic sea ice reached its third-lowest winter maximum.

Most items are single studies, and several are early results. Each section below says how strong the evidence looks, and the tables list what was reported and when. For a general method, see how to evaluate a claim.

Space: a telescope beats expectations and a young planet candidate

NASA's Roman Space Telescope was reported to have exceeded expectations by nearly 30 per cent. Engineers moved a mirror by a distance described as one-sixteenth the width of a human hair to sharpen the view. Webb observations of a brown dwarf about 20 light-years away found three recurring atmospheric states, driven by temperature.

Six new planets were added to the Exoplanet Archive on 15 October. One of them, Elias 2-24 b, is less than a million years old and may be the youngest known exoplanet. That is a claim still to be checked, not a settled record. A report of a lopsided atmosphere on a gas giant 1,300 light-years away could not be checked in full, so treat it as early.

Elsewhere, ALMA detected a rare form of methanol in space for the first time, and Perseverance was reported to hold the record for the longest distance travelled on another world. A SpaceX cargo flight to the ISS carried tiny brain models, 3D heart tissue and equipment for making artificial retinas in space.

Technology and AI: has AI made a real scientific discovery this week?

Most of the week's AI items are computer-assisted results from single studies rather than sudden breakthroughs. Researchers used AI to uncover nearly 10,000 chemical reactions in the conversion of carbon dioxide into fuel. A method was also reported that helps AI models understand crystalline materials in three dimensions, and another model decodes the language cells use to communicate while building tissues. For wider context on what AI has and has not delivered, see AI in archaeology, discoveries or hype.

Machine-learning weather forecasts were reported to have broken records for predictions two to six weeks ahead, which matters for emergency planning. Work on how artificial neural networks can build their own learning machinery without detailed instructions from a designer was reported on 13 October.

Life and health: is the new fatty liver drug ready for patients?

No. A drug that reversed severe fatty liver disease worked in animal models, by restoring gut health. The coverage reviewed describes results in animal models only, so it is not yet a treatment for people. Animal results often do not carry over to humans, and nothing here is medical advice.

Researchers also described a two-way relationship between sleep and growth hormone. A Stanford team reported a microscope that views living cells without the fluorescent labels usually needed. A study in Science Advances looked at how long spaceflight affects the human genome.

Earth and climate: is Arctic or Antarctic sea ice at a record low in 2026?

Antarctic sea ice is not at a record low: it reached its third-lowest winter maximum in 2026, which is low but not the lowest on record. The reports reviewed describe Arctic sea ice as thinner, younger and more vulnerable to melting, a point about its condition as well as its extent, and do not report an Arctic record low. The wider evidence base is covered in what the scientific record shows on climate.

A study spanning up to 24 years found that forest soils are removing more methane as temperatures rise and rainfall falls. It is a useful reminder that land can also absorb greenhouse gases.

Archaeology, palaeontology and history

A 210-million-year-old dinosaur from Zimbabwe was described this week, one of several dinosaur finds reported. A 165-million-year-old fossil from a tiny Jurassic predator was reported on 13 October, and a 120-million-year-old fossil with giant claws, forgotten in a museum collection, on 14 October.

In history, an analysis suggests Nazi Germany's final experimental uranium reactor was nowhere near as close to working as previously claimed. As with any single analysis, other historians may weigh in.

Physics, chemistry and what to look out for next

Oxford physicists recreated an effect in which a particle responds to a magnetic field without travelling through it, using a hybrid quantum computer. The exact results are not yet checked. A plastic-eating enzyme nicknamed Pac-Man and work on quantum vortices in superconductors were also reported. A study on 16 October suggested neutrinos could play a significant role in whether a dying star becomes a supernova or a black hole.

Next, look for confirmation of the Elias 2-24 b age claim, follow-up Webb and Roman results, and the full sea ice season records. Check primary releases before relying on any single headline, and remember what scientific consensus means: one paper rarely settles a question.