Comètes : formation et histoire du système solaire

Snowmen Flying Through Deep Space

A new simulation from Michigan State University shows how two‑lobed, snowman-shaped Kuiper Belt objects can form naturally by gravitational collapse, and explains how icy grains s… Fév 27, 2026

Physics

3I/Atlas Brakes Near Mars, Physics Models Challenged

Data this week show interstellar comet 3I/Atlas slowed to near‑stop about 27 million km from Mars, forcing scientists to re-evaluate non‑gravitational forces and orbital models us… Fév 22, 2026

Technology

3I/ATLAS Is Not an Alien Probe

Comet 3I/ATLAS—only the third confirmed interstellar object to visit our solar system—has been scanned by major radio and optical facilities; scientists report no signs of enginee… Jan 13, 2026

Space

Why 3I/ATLAS's 'Non‑Gravitational' Kick Matters

Astronomers say interstellar comet 3I/ATLAS experienced a small acceleration that gravity alone can't explain. Here's what the measurements mean, how jets of gas can push a comet,… Déc 17, 2025

Space

UN Confirms 3I/ATLAS as Official Planetary-Defence Exercise

The UN has formally designated the interstellar comet 3I/ATLAS as the focus of a global planetary-defence drill, turning an unusual cosmic visitor into a real-world test of humani… Nov 27, 2025

Science

Musk: 3I/ATLAS Could Threaten Humanity

Elon Musk warned on a recent podcast that the interstellar visitor 3I/ATLAS—while almost certainly not aimed at Earth—would be catastrophic if it ever struck the planet. Scientist… Nov 17, 2025

Space

Comet Tracker: Where to See the Comets on Thursday, Oct. 23, 2025

Comets Lemmon (C/2025 A6) and SWAN (C/2025 R2) are visible after sunset in the Northern Hemisphere on Oct. 23, 2025. Binoculars will help reveal their tails; this is a last good v… Nov 12, 2025

comètes

Articles about comètes

Snowmen Flying Through Deep Space

3I/Atlas Brakes Near Mars, Physics Models Challenged

3I/ATLAS Is Not an Alien Probe

Why 3I/ATLAS's 'Non‑Gravitational' Kick Matters

UN Confirms 3I/ATLAS as Official Planetary-Defence Exercise

Musk: 3I/ATLAS Could Threaten Humanity

Comet Tracker: Where to See the Comets on Thursday, Oct. 23, 2025