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Iridescent colours on a cloud observed in Brampton, Canada, in January 2019.Science · Nov 8, 2026Iridescent clouds: diffraction, the source of colour in the skyClouds with colourful reflections can appear without rain. Their iridescence comes from the diffraction of light by tiny droplets or crystals, a mechanism distinct from those behind rainbows and halos.A green flash visible on the horizon during a sunset in Grenada.Basic science · Nov 7, 2026Green flash: why the Sun’s last edge can change colourThe green flash is not a new kind of light from the Sun. Refraction, dispersion and atmospheric conditions explain why its last edge can briefly appear green.Smoke over Borneo seen by satellite, archive image from September 2019.Nature and environment · Nov 1, 2026Fires in Indonesia: understanding the human toll of the smokeCREA estimates that smoke was linked to 3 560 deaths in September 2026. Behind this figure, different methods and environments shed light on the crisis.Artist’s impression of TOI-561 b and its atmosphere above an ocean of magma; illustration published in 2025.Space · Nov 1, 2026TOI-561 b: how Webb is investigating the clouds of a lava planetA study of infrared variations from TOI-561 b favours a highly reflective atmosphere. Here is what Webb is actually measuring, what the models explain and what remains to be verified.The Aletsch Glacier and its neighbours in the Swiss Alps, seen by Landsat 8 on 6 August 2024.Climate · Nov 1, 2026Retreating glaciers: what a map cannot tell a walkerMaps record the retreat of glaciers, but do not describe conditions on the day. From measuring climate change to unstable terrain and route planning, here are the key distinctions to bear in mind.Earth’s horizon and clouds photographed in black and white from a V-2 rocket on 24 October 1946.Space · Oct 26, 2026The first photograph of Earth from space: what the 1946 flight showedA camera aboard a V-2 photographed Earth on 24 October 1946, from an altitude of about 105 kilometres. A suborbital flight, long before images of the entire globe.Lenticular clouds above snow-covered Mount Rainier in Washington State.AI · Oct 26, 2026Weather and AI: what Dubai and forecasts several weeks ahead revealTwo studies from October 2026 shed light on progress in AI forecasting. Their findings relate to specific models, lead times and tests.Artist’s impression of WASP-17 b: a cloudy globe partially illuminated in space.Space · Oct 26, 2026WASP-17 b: Webb reconstructs a more extended atmosphere on the evening sideA transit-mapping method distinguishes several regions along the edge of the atmosphere. It refines measurements without providing a photograph or a complete weather report for this gas giant.Saqqap Glacier and the edge of the Greenland ice sheet, Landsat image from 21 August 2025.Climate · Oct 26, 2026Greenland: what the 2,347 km³ of ice lost between 2010 and 2023 measuresAn analysis combining CryoSat and ICESat-2 describes the thinning of the ice sheet. It is also valuable for comparing two measurement methods.A forest path near Echternach, photographed in May 2019.Society · Oct 26, 2026After a storm: precautions to take in Luxembourg’s forestsCalmer weather does not necessarily make a path safe. Weakened trees, hanging branches, closures: useful guidance before heading out.Lenticular clouds in smooth layers above snow-covered Mount Rainier, Washington State, in 2011.Basic science · Oct 26, 2026Lenticular clouds: why do they seem to stand still in the wind?Their lens-shaped form sometimes stays in place while air flows through them. Condensation, terrain and mountain waves explain this apparent paradox.Spherical metal model of the DAVINCI probe inside a test facility.Space · Oct 1, 2026DAVINCI: why NASA is preparing a probe for Venus’s 465°C heatA DAVINCI capsule has withstood 465°C six times in ground tests. NASA wants to understand how Venus evolved and whether it once had liquid water.
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