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Bertrand Bonfond

@berbonf.eurosky.social

European Space Scientist and #FNRS Research Associate from #ULiège (Be). I work on Jupiter's aurorae and participate to the NASA #Juno mission.

188 Posts176 Follower186 Folgt
ESA Space Science@science.esa.int · yesterday

12 August: for over one minute, day turns to night 🌑 thanks to a total solar eclipse. But will it be visible from your place? Check out these maps to find out. If you're close to the path of totality, but not within it, it is totally worth the travel! 1/2 🔭 🧪 #EuropeanSolarEclipse

Map of Earth shown as a globe, with the focus on its northern hemisphere. A red, C-shaped arc marked 'total eclipse' reaches from northeast Russia, past the North Pole, Greenland, Iceland and the Iberian Peninsula. An orange oval surrounds this arc, marked 'partial eclipse', covering most of Europe, Canada and parts of the USA, the western edge of Africa and the northeastern corner of Russia.Spain and Canary Islands map showing total solar eclipse path on 12 Aug 2026 with totality band and darkness contours
Phil Plait@philplait.bsky.social · last wk.

This oxygen emission line can only occur in very rarefied gas: if atoms collide enough it deexcites the electron and you don't get the line. It took a long time to figure that out (it's very hard to get such low density oxygen in the lab), and the ubiquity of this line baffled them for many years.

Michael Merrifield@astromikemerri.bsky.social · last wk.

I love old astronomy books. Here they are in 1902 struggling with the identification of my favourite emission line, the 500.7nm emission from oxygen. It is a forbidden transition, so not seen in normal lab spectra; here it is speculated to be from an unknown element, “nebulum.” 🧪🔭

Nicolas Berrod@nicolasberrod.bsky.social · 2w ago

📉 Une baisse de mortalité par rapport à la valeur attendue de... 100 % ! Aucune des femmes de 20 à 24 ans en Angleterre n'est décédée d'un cancer du col de l'utérus entre 2020 et 2024, avec une couverture vaccinale contre les infections à HPV proche de 90% à l'adolescence. 1/4

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François Gemenne@gemenne.bsky.social · 2w ago

Si la Chine est leader de la transition énergétique, c'est aussi parce que les investissements sont très encouragés par les pouvoirs publics. L'Europe se tire une balle dans le pied en refusant de faire de même.

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Don Davis@ddavisspaceart.bsky.social · 2w ago

The first glimpse of the Martian surface was long anticipated. Bonestell's art dominated ideas of what Mars was like, basically the desert Southwest with most air absent. The idea of a dark blue sky on Mars persisted in space art until that morning. Here are those first looks at the Martian surface.

Top: the first view of the Martian surface, which appeared in slow steps left to right as the data came in. They wanted first thing to know if the lander was on solid ground and not too buried, sinking etc. The imaging sequence started 25 seconds after landing and continued for 5 minutes as the camera scanned a vertical line at a time moving to the right to scan the next. Having the orbiter relay the data took another 20 minutes. At left a brightening in the image can be seen that intensifies then fades, followed by a darkening that soon goes away. That represents a kind of record of the dust kicked up by the landing that brightened the field of view, then the shadow of the dust cloud briefly darkened the scene. The prominent angular rock near upper center is about 10 cm (4 inches) across. This first peek reassured everyone that the lander was on solid ground. A little dirt kicked up by the lander rockets can be seen pooled in the footpad. Bottom: 6 minutes after landing the second photo was obtained, a lower resolution 300 degree wide panorama of the surroundings taking in the scene in 9 minutes. At once the character of the scenery showed its distinctive nature, rocky and lightly even ground with small drifts and patches of lighter fine dust. The presence of dust in the atmosphere brought a brightness to it that was not anticipated, as an artist that was the major revelation I felt when looking over the scene. The atmospheric density was known to be like Earth's at 40 kilometers or 130,000 feet, so any noticeable blue sky brightness should only be evident near the horizon. In reality, the eternal presence of wind blown dust makes the sky a luminous version of the color of the ubiquitous surface dust, especially in the quarter of the sky near the Sun. Suddenly rendered dated were all those paintings by Bonestell, Pesek and others which were done between the times of the Mariner missions and the Viking landings, showing interpretations of known features but … I had my Polaroid SX-70 camera with me when just after the landing I was suddenly escorted from the press area into into the imaging team room, hastily badged and plopped in front of some of the many monitors in the area which steadily unveiled the first two looks at the Martian surface. No journalists were there dur to JPL PR department policy, but I got a few photos and a sound recording of the excited chatter of the geologists seeing Mars revealed. "Look at the exposure on that S_O_B" I remember hearing when the prominent rock appeared. Then the President called in his congratulations which went over the PA system. A highlight of my life, onr of several instances where I was in the Coolest Place in the world at that moment. My carefully obtained Polaroid from a monitor in the Imaging team area, at the conclusion of the introductory scanning of the first photo obtained of the surface of Mars.
Greg De Temmerman@gregdt.bsky.social · 4w ago

Europe is too slow on electrification and it is a big problem. Despite 2 major energy crises, the narrative remains vague. The countries (like China) who are pulling ahead will maintain an advantage for quite some time. Nice wake up call from Fatih Birol in @financialtimes.com

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Agence France-Presse@afp.com · 4w ago

Sur plusieurs kilomètres, il ne reste que des roches et des cailloux : près de la frontière franco-suisse, la rivière Doubs a disparu, manifestation la plus saisissante de la sécheresse qui touche actuellement le département du même nom, placé en "alerte renforcée". Reportage ➡️ u.afp.com/SKD7

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Suave Morbida@maitre-poulard.bsky.social · last mo.

Je veux pas foutre la honte à Trump avec ses plans pour influencer la coupe du monde, mais Neron, lui, il s'est pas contenté de tirer les ficelles: lors des JO de 67. Il a carrément participé et il a ramené la médaille à la domus (les rageux parleront de triche, mais osef)

Results Games 67 CE Ancient Olympics Discipline (Sport) /Event Ancient Combative Sports (Ancient Sports) Ancient Equestrianism (Ancient Sports) Unknown Event, Men (Ancient Olympics) Chariot Race, Men (Ancient Olympics) Chariot Race for 10 Horses, Men (Ancient Olyrnpics) Chariot Race for Foals, Men (Ancient Olympics) Ancient Art Competitions (Ancient Sports) Competition for Heralds, Men (Ancient O'ympics) Competition for Tragedy, Men (Ancent Olympics) Competition for Lyre-Playing, Men (Ancient Olympics) NOC Team ROM ROM Pos Medal As 1 1 1 Gold ROM Gold 1 Nero, Emperor of Roma Nero, Emperor of Roma Gold Gold 1 Gold 1 Nero, Emperor of Roma Gold 1 Gold
Alain Gerlache@agerlache.bsky.social · last mo.

Le plus drôle, c'est l'embarras des trumpistes en Belgique qui il y a une semaine pavoisaient au Cinquantenaire lors de la fête de Bill White. Il paraît même qu'on se serait cru au congrès d'un parti.

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Eric Lagadec@ericlagadec.bsky.social · last mo.

Aujourd'hui, la Terre est au plus loin du Soleil. C'est l'aphélie. On est à ~152 millions de km du Soleil alors que le 3 janvier, on était à 147 millions de km. Et cela n'apporte clairement aucune fraîcheur en France !

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ESO@eso.org · last mo.

This is why we call it the Extremely Large Telescope! This photo shows the massive, 39-metre-diameter structure that will hold the main mirror of our ELT.   798 mirror segments will sit here, working together as a single mirror, in what will be the biggest optical telescope on Earth. 🔭 🧪 1/3

The interior of the Extremely Large Telescope. The metallic grey main structure can be seen in the entire picture, with three people standing in front of it, in hard hats and green safety vests. The people are much smaller than the telescope’s structure.
Melaine Le Roy@subfossilguy.bsky.social · last mo.

A single graph says it all! 📈 Daily temperature in France (1961–1990 baseline) 🌡️ Red: above long-term normal. Dark red: >95th percentile. Extremes aren't outliers anymore — they're now part of the story 🔥 And there are still some who say there have been “cold” periods! 🤡 Via @drxeo.eu 🙏

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Université de Liège@universitedeliege.bsky.social · last mo.

ERC Proof of Concept projects 👏 Lionel Clermont - nGHOST2Market - will track down stray light in space telescopes Christophe Collette - GrAVITe -will build an optical gyroscope to shield precision instruments from vibration. @erc.europa.eu www.news.uliege.be/cms/c_206853...

Lionel Clermont and Christophe Collette have secured European ERC Proof of Concept funding

nGHOST2Market to track stray light from space telescopes and GrAVITe, an optical gyroscope to stabilise high-precision instruments.

news.uliege.be

ESO@eso.org · last mo.

The largest levitating mirror in the world? 🪞 The fourth mirror in the ELT’s light path is one of the most challenging optical components of the telescope. When finished, it will surpass any adaptive mirror ever made for a telescope & be the largest of its kind. 🔭 🧪 #instrumentation

Rêves d'espace@revesdespace.bsky.social · last mo.

🛰️☀️ La mission sino-européenne #Smile a atteint son orbite scientifique le 20 juin. Depuis son lancement le 19 mai, son moteur principal a été allumé 12 fois pour atteindre l'orbite finale très elliptique à 120 920 km au-dessus du pôle Nord pour l'étude de la magnétosphère terrestre. 1/2

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Aurélien Genin@astroaure.eurosky.social · 2mo ago

🔭 Tous les 3 mois, le télescope spatial JWST prend un "selfie" de son miroir primaire de 6,5m. Et on y voit plein de petits points qui apparaissent avec le temps 🤔 Ce sont des impacts de micrométéoroïdes 🤯 J'en compte 175 sur la plus récente image, soit environ 4 impacts par mois. 1/3

Astropierre@astropierre.com · last mo.

Un juge américain a bloqué les tentatives de l'administration Trump de privatiser des éléments clés du Centre National de Recherche Atmosphérique (NCAR), un laboratoire de recherche de renommée mondiale sur le climat et la météorologie, situé au Colorado. 1/3

Photo du panneau d'entrée du NCAR (National Center for Atmospheric Research)