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Télescope spatial James Webb
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Télescope spatial James Webb

Le télescope spatial James Webb (JWST) est l'observatoire le plus puissant de l'humanité, scrutant l'univers en infrarouge. Imaginez-le comme des « super-yeux » qui voient bien plus loin que Hubble. Son miroir de 6,5 mètres, composé de 18 hexagones, ressemble à un nid d'abeilles. Pour rester au froid, il est protégé par un bouclier de la taille d'un court de tennis. Le JWST ne tourne pas autour de la Terre comme la Lune ; il se trouve à 1,5 million de kilomètres, au point L2. Là, dans l'ombre de la Terre, il observe la naissance des premières étoiles et galaxies.
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Latest news from Télescope spatial James Webb

Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
iconYesterday
iconÉtoiles | Exoplanètes | Super-Terre | Jupiter chaud | Télescope spatial James Webb
Image: Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
Transit timing variations occur when a planet crosses in front of its host star at slightly different times than expected. These small shifts provide information about the orbital path of a planet and the presence of other gravitational forces in the system. By measuring these variations, observers can understand the dynamics and evolution of distant planetary systems. The James Webb Space Telescope provides the high-precision data necessary to track these subtle events across a wide range of...
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HD 158485 revealed as a binary system containing two pulsating stars
icon14. 10. 2026
iconÉtoiles | Télescope spatial James Webb | TESS
Image: HD 158485 revealed as a binary system containing two pulsating stars
HD 158485, a calibration star for the James Webb Space Telescope, is actually a binary system. Observations from TESS show two pulsating stars orbiting each other every 382.8 days, which helps refine absolute-flux measurements for astronomical data....
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Atmospheric composition of sub-Neptune planets around Red dwarf stars reveals new hybrid class
icon6. 10. 2026
iconÉtoiles | Exoplanètes | Naines rouges | Télescope spatial James Webb | Atmosphères planétaires | Planètes océ
Image: Atmospheric composition of sub-Neptune planets around Red dwarf stars reveals new hybrid class
Analysis of sub-Neptune planets around Red dwarf stars using JWST data reveals a new category of hybrid worlds. These planets have atmospheric compositions that do not align with traditional gas dwarf or water world definitions. Study highlights include TOI-776 c....
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Atmospheric composition of the temperate super-Jupiter Epsilon Indi Ab revealed
icon3. 10. 2026
iconÉtoiles | Exoplanètes | Naine orange | Télescope spatial James Webb | Atmosphères planétaire
Image: Atmospheric composition of the temperate super-Jupiter Epsilon Indi Ab revealed
The atmosphere of Epsilon Indi Ab, a temperate super-Jupiter, has been characterized using JWST. Observations confirm the presence of ammonia, water, and methane, demonstrating a successful method for isolating planetary signals from host star light....
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Atmospheric analysis of LTT 9779 b reveals muted spectral features and cloud presence
icon3. 10. 2026
iconÉtoiles | Exoplanètes | Étoiles de type solaire | Télescope spatial James Webb | Atmosphères planétaire
Image: Atmospheric analysis of LTT 9779 b reveals muted spectral features and cloud presence
New JWST observations of the ultrahot Neptune LTT 9779 b reveal muted spectral features, indicating a cloudy atmosphere. The study measured temperatures at the planet's terminator and identified potential cloud properties for this rare world in the hot Neptune desert....
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