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Posts by Bernard Valeur

To learn more about the psychedelic colors of nudibranchs,
read my article👇 tinyurl.com/3t2x3yy8
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1 day ago 5 2 0 0
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Questions de goûts et de couleurs : le poivre D’où vient le poivre, cette épice incontournable ? Il s’agit du fruit présent dans les baies du Poivrier noir (Piper nigrum), une plante tropicale de la famille des Pipéracées, originaire du S…

LES SIX COULEURS DU POIVRE
sont : vert, noir, rouge, blanc, jaune, gris.
D’où proviennent-elles ? Sont-elles en lien avec des goûts différents ?

Réponses dans mon nouvel article
👇 tinyurl.com/4dbkabru

3 days ago 9 5 0 1

Pourquoi la chevelure de nombreuses comètes est-elle verte ? Pourquoi leur queue ionique est-elle bleue ?
Réponses dans mon article 👇 tinyurl.com/y533t75w

1 week ago 9 4 1 1
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« Selon une étude... » : le casse-tête de la vulgarisation scientifique pour les journalistes Jamais les études scientifiques n’ont été autant relayées dans les médias. Mais les journalistes ne sont parfois pas assez formés à leur traitement et aux spécificités de l’écosystème de la recherche.

🔬 « Selon une étude… » Aujourd’hui, pléthore d’articles relayant des études scientifiques sont publiés dans les médias. Pourtant, les journalistes derrière ces articles ne sont pas tous formés pour sélectionner, comprendre et vulgariser correctement ces études. ✍️ Explications de Radidja Cieslak. 👇

2 weeks ago 14 10 0 1
Le globe terrestre avec en bas à gauche l'Espagne et le Portugal, et l'Afrique très bien visible. On distingue des aurores de part et d'autre de la planète ainsi que la poussière zodiacale.
Crédits : NASA/Reid Wiseman

Le globe terrestre avec en bas à gauche l'Espagne et le Portugal, et l'Afrique très bien visible. On distingue des aurores de part et d'autre de la planète ainsi que la poussière zodiacale. Crédits : NASA/Reid Wiseman

🌍 Fantastique image de la Terre photographiée par Reid Wiseman, commandant de la mission Artemis II, peu après l'injection en orbite translunaire.
Cela fait 54 ans que des humains ne s'étaient pas autant éloignés de la Terre !
Notez les aurores de part et d'autre du globe et la lumière zodiacale.

2 weeks ago 229 57 13 8

Pour en savoir plus sur les colonnes de lumières colorées
👉 tinyurl.com/2f74ceu5

2 weeks ago 4 1 0 0
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Rave worm! What a gorgeous display this polychaete worm’s setae is giving under UV light!

#marineplankton 🦑

1 month ago 252 54 6 2
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INÉDIT 🎬 Un simple cercle, 72 couleurs… et une révolution artistique. Au XIXᵉ siècle, les découvertes du chimiste Chevreul bouleversent la peinture et inspirent toute une génération d’artistes. 🎨

Le reportage complet 👉 lejournal.cnrs.fr/videos/la-sc...

3 weeks ago 16 7 0 0
Illustration montrant des cellules entourées de lignes de champ magnétique

Illustration montrant des cellules entourées de lignes de champ magnétique

Des marqueurs protéiques fluorescents (utilisés pour suivre le fonctionnement interne des cellules) sont transformés en qubits (unité fondamentale de l'information quantique)

Sous cette forme, ils servent de capteurs quantiques et révèlent l'activité cellulaire avec une précision sans précédent

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4 weeks ago 25 13 2 0
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Disparition d'Alain BRILLET (85e) La communauté des alumni de l'ESPCI a appris avec une grande tristesse la disparition d'Alain BRILLET, Médaille d'or du CNRS 2017, ce vendredi 20 mars 2026. Diplômé Ingénieur de la 85e promotion de l’...

La communauté des alumni de l'ESPCI a appris avec une grande tristesse la disparition d'Alain BRILLET (85e), Médaille d'or du CNRS 2017, ce vendredi 20 mars 2026.

espci.org/news/13115967

@egovirgo.bsky.social
@cnrscotedazur.bsky.social
Photo : © Frédérique PLAS/CNRS Photothèque

1 month ago 6 1 0 0
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For #molluscmonday the the red-lined bubble snail (Bullina lineata). Although delicate looking, they are voracious predators on small worms.

2 months ago 474 67 5 3
Hypnotic photo of a curtain aurora that truly looks like a flying dragon.The image is extraordinary: an enormous serpentine green shape twisting through the night sky above a snow-covered landscape, with tiny human silhouettes that emphasize the epic scale. It looks like something straight out of a fantasy story, yet it is completely real.

Hypnotic photo of a curtain aurora that truly looks like a flying dragon.The image is extraordinary: an enormous serpentine green shape twisting through the night sky above a snow-covered landscape, with tiny human silhouettes that emphasize the epic scale. It looks like something straight out of a fantasy story, yet it is completely real.

🧵
'Dragon Aurora over Norway' is an enchanting pic showing an impressive auroral curtain, captured by Marco Bastoni above Tromsø in Northern Norway.

The aurora's glittering green glow somehow reminds of a large dragon. 🔭

➡️ apod.nasa.gov/apod/ap18041...

🧪 ⚛️ #sciart #astrophotography #science

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2 months ago 1143 204 11 10

Le saviez-vous ?
La médaille d'or des Jeux olympiques contient 6 g d'or et 500 g d'argent.
Elle vaut 1640 €... sans compter sa valeur symbolique et affective.

2 months ago 4 2 0 0
The Cone Nebula
This is the iconic pillar in NGC 2264, ~2,500 away in Monoceros, rising from a fiery red sea.  It looks dark and monstrous against a glowing crimson hydrogen backdrop, blue crest shining with scattered stars. Hits me hard every time—how stars savage the gas cloud to shape it, yet spark brand-new suns in the exact same chaos. Total proof the cosmos is raw, alive, and insanely gorgeous. 

Source: https://esahubble.org/images/heic0206f/
Credits: NASA, H. Ford (JHU), G. Illingworth (UCSC/LO), M. Clampin (STScI), G. Hartig (STScI), the ACS Science Team, and ESA.

The Cone Nebula This is the iconic pillar in NGC 2264, ~2,500 away in Monoceros, rising from a fiery red sea. It looks dark and monstrous against a glowing crimson hydrogen backdrop, blue crest shining with scattered stars. Hits me hard every time—how stars savage the gas cloud to shape it, yet spark brand-new suns in the exact same chaos. Total proof the cosmos is raw, alive, and insanely gorgeous. Source: https://esahubble.org/images/heic0206f/ Credits: NASA, H. Ford (JHU), G. Illingworth (UCSC/LO), M. Clampin (STScI), G. Hartig (STScI), the ACS Science Team, and ESA.

Mystic Mountain in the Carina Nebula
This picture never fails to mess with me—like I’ve accidentally stepped into some brutal, jagged fantasy landscape that’s actively on fire. Hubble snagged it in 2010: a rough spike of gas & dust lost in the insane storm that is the Carina Nebula, sitting about 7,500 light-years out.  Tiny new stars are losing their minds inside, shooting Herbig-Haro jets everywhere like they’re trying to escape. At the same time the monster stars right next door are sandblasting the whole thing with radiation, eating the edges away.  The palette is ridiculous—sharp electric blue oxygen, warm green-gold from hydrogen and nitrogen, angry red sulfur glowing through it all. Feels straight-up like a Tolkien mountain caught in an apocalypse, pure violent energy. Just stars being born the hard way, screaming into existence. Wild.  
Source: https://science.nasa.gov/asset/hubble/hubble-captures-view-of-mystic-mountain/ 
Credits: NASA, ESA, M. Livio and the Hubble 20th Anniversary Team (STScI).

Mystic Mountain in the Carina Nebula This picture never fails to mess with me—like I’ve accidentally stepped into some brutal, jagged fantasy landscape that’s actively on fire. Hubble snagged it in 2010: a rough spike of gas & dust lost in the insane storm that is the Carina Nebula, sitting about 7,500 light-years out. Tiny new stars are losing their minds inside, shooting Herbig-Haro jets everywhere like they’re trying to escape. At the same time the monster stars right next door are sandblasting the whole thing with radiation, eating the edges away. The palette is ridiculous—sharp electric blue oxygen, warm green-gold from hydrogen and nitrogen, angry red sulfur glowing through it all. Feels straight-up like a Tolkien mountain caught in an apocalypse, pure violent energy. Just stars being born the hard way, screaming into existence. Wild. Source: https://science.nasa.gov/asset/hubble/hubble-captures-view-of-mystic-mountain/ Credits: NASA, ESA, M. Livio and the Hubble 20th Anniversary Team (STScI).

The Veil Nebula
This pic always creeps me out in the best way—like catching the faint leftover smoke from a star that blew up around 8,000 years ago. It was a heavy one, roughly 20× our Sun, and now we’ve got this huge expanding shell called the Cygnus Loop, about 2,100 light-years out.  Spreads over 110 light-years and still racing away at insane speed. When Hubble gets close you see these thin, wispy threads curling everywhere: soft blue-green oxygen, red hydrogen, some sulfur mixed in—looks like torn lace or drifting cosmic smoke.  Quietly brutal. All that’s left of a massive star, yet those threads are basically planting the seeds for the next round of planets and suns. Eerie, gorgeous, and kind of humbling.  

Source: https://science.nasa.gov/image-detail/veil-nebula/
Credits: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

The Veil Nebula This pic always creeps me out in the best way—like catching the faint leftover smoke from a star that blew up around 8,000 years ago. It was a heavy one, roughly 20× our Sun, and now we’ve got this huge expanding shell called the Cygnus Loop, about 2,100 light-years out. Spreads over 110 light-years and still racing away at insane speed. When Hubble gets close you see these thin, wispy threads curling everywhere: soft blue-green oxygen, red hydrogen, some sulfur mixed in—looks like torn lace or drifting cosmic smoke. Quietly brutal. All that’s left of a massive star, yet those threads are basically planting the seeds for the next round of planets and suns. Eerie, gorgeous, and kind of humbling. Source: https://science.nasa.gov/image-detail/veil-nebula/ Credits: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

NGC 2014 and NGC 2020 in the Large Magellanic Cloud (Cosmic Reef)
Way out in the Large Magellanic Cloud—163,000 light-years from home—you see this big angry red patch (NGC 2014) getting blasted bright by a bunch of really heavy stars, 10–20 times our Sun’s size.  Then, right next to it, that perfect electric-blue bubble (NGC 2020) carved clean by one single Wolf-Rayet monster throwing out 200,000× the Sun’s light.  The reds/oranges scream hydrogen + nitrogen; the sharp blue ring is oxygen going nuts. Looks exactly like some underwater coral reef… except the whole scene is only about 5 million years old.  
Source: https://science.nasa.gov/asset/hubble/cosmic-reef/
Credits: NASA, ESA and STScI

NGC 2014 and NGC 2020 in the Large Magellanic Cloud (Cosmic Reef) Way out in the Large Magellanic Cloud—163,000 light-years from home—you see this big angry red patch (NGC 2014) getting blasted bright by a bunch of really heavy stars, 10–20 times our Sun’s size. Then, right next to it, that perfect electric-blue bubble (NGC 2020) carved clean by one single Wolf-Rayet monster throwing out 200,000× the Sun’s light. The reds/oranges scream hydrogen + nitrogen; the sharp blue ring is oxygen going nuts. Looks exactly like some underwater coral reef… except the whole scene is only about 5 million years old. Source: https://science.nasa.gov/asset/hubble/cosmic-reef/ Credits: NASA, ESA and STScI

"...it's a mysterious and marvelous fact that our universe obeys laws of nature that always turn out to be expressible in the language of calculus as sentences called differential equations."

— Steven Strogatz, 'Infinite Powers'

🔭 🧪 #Hubble images' description, sources, credits in the ALT text

2 months ago 110 41 3 3
volcan etna en éruption de nuit

volcan etna en éruption de nuit

Vous voulez du beau aujourd'hui ?

Voici l'Etna (Sicile) photographié par Gianluca Gianferrari lauréat du grand prix photo de HIPA.
😍

2 months ago 81 19 1 0

"Je suis de ceux qui pensent que la science est d'une grande beauté.

Un scientifique dans son laboratoire est, non seulement un technicien, il est aussi un enfant placé devant des phénomènes naturels qui l'impressionnent comme des contes de fées."

Marie Curie

2 months ago 169 36 6 0
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You can also see History of Quantim Dots
➡️ youtu.be/6qEWG8xu6wQ?...

2 months ago 1 1 0 0
Thamserku right there, all snowy and razor-sharp in Nepal, and above it this cloud that looks straight out of a dream. Pale pink, light green, turquoise fading into almost-nothing violet, all happening along the edges—like the light just shattered into little colored bits.It's not a full rainbow, nah, just pieces of one. Tiny tiny droplets, all the same size, scattering the sun in exactly that way. The mountain underneath stays freezing, white and icy blue, but the cloud is glowing warm, almost unreal, with that low sun hitting it from behind.

Thamserku right there, all snowy and razor-sharp in Nepal, and above it this cloud that looks straight out of a dream. Pale pink, light green, turquoise fading into almost-nothing violet, all happening along the edges—like the light just shattered into little colored bits.It's not a full rainbow, nah, just pieces of one. Tiny tiny droplets, all the same size, scattering the sun in exactly that way. The mountain underneath stays freezing, white and icy blue, but the cloud is glowing warm, almost unreal, with that low sun hitting it from behind.

🧵
Do you know the effect called cloud iridescence or irisation?🧪

When parts of clouds are thin and have similar size droplets, diffraction can make them shine with colours like a corona.🔭

In fact, the colours are essentially corona fragments. ⚛️

➡️ apod.nasa.gov/apod/ap14070...

#sky #Nature

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2 months ago 89 23 2 1

Le vert des plumes d'oiseaux résulte de la superposition du jaune d'un pigment et du bleu structurel résultant de la diffusion de la lumière par les barbules.
C'est le cas notamment de la perruche verte. Si le pigment jaune n'est pas produit en raison d'une mutation génétique, la perruche est bleue.

3 months ago 8 2 0 0
A rainbow of red light over land

A rainbow of red light over land

A rainbow of red light over land

A rainbow of red light over land

Just observed a “red rainbow”, a rainbow of atmospherically refracted red/orange light just prior to sunrise.

📸 @stephanieg3.bsky.social

3 months ago 129 18 3 0

Dans ce débat sur La nuit étoilée de Van Gogh, on oublie de dire que ce peintre, passionné d’astronomie, lisait régulièrement la revue L’Astronomie, éditée par son ami Camille Flammarion, revue dans laquelle figuraient des représentations de "nébuleuses cosmiques". Son inspiration vient de là !

3 months ago 6 1 0 0
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Trois choses à savoir sur les aurores boréales

Que se cache-t-il derrière les aurores boréales ?
Jean Lilensten, astronome et planétologue, décrypte les trois choses à savoir pour comprendre les aurores boréales.

3 months ago 22 12 1 0

Merci d'avoir pensé à moi !
N'étant pas abonné à Sciences et Avenir, je ne peux pas me procurer cet article, mais je dispose d'une large documentation sur ce sujet que j'ai traité en détail dans mon livre "Lumière et luminescence".

3 months ago 1 0 0 0

Color isn’t real the way you think it is.

It’s a private hallucination your brain creates from three cleverly overlapping sensors in your eyes.

The author explains it so cleanly it hurts (in a good way).

150th color post. Don’t miss it.🧪 ⚛️

#ColorPerception #Optics #Light #Science #VisionScience

3 months ago 51 19 7 2
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Thank you so much for your nice comments on my post.

3 months ago 1 0 1 0
Slender glowing ribbon of gas, tilted like a narrow pencil, stretches diagonally through the deep space. Delicate red and blue threads weave and shimmer along its sharp form, brightest at the upper-right tip. Distant stars dot the void behind, dominated by the red of ionized hydrogen.

Slender glowing ribbon of gas, tilted like a narrow pencil, stretches diagonally through the deep space. Delicate red and blue threads weave and shimmer along its sharp form, brightest at the upper-right tip. Distant stars dot the void behind, dominated by the red of ionized hydrogen.

What is this? Maybe a painting?

No!

It's about NGC 2736, or Pencil Nebula, a small part of the Vela Supernova Remnant. 🔭

It's thought to be formed from part of its shock wave, plowing through interstellar space at over 500,000 km per hour!

Image by Greg Turgeon & Utkarsh Mishra

🧪 #science 1/3

3 months ago 117 36 5 2

Rien d'autre qu'un nuancier pour la couture.

3 months ago 0 0 0 0
La Lune et le Soleil sont chacun entourés d'un ensemble complexe de halos de glace sur ces photos du ciel au-dessus de Chamonix-Mont-Blanc, et enregistrées une nuit (à gauche) et le lendemain, à la fin du mois de décembre 2025.

La Lune et le Soleil sont chacun entourés d'un ensemble complexe de halos de glace sur ces photos du ciel au-dessus de Chamonix-Mont-Blanc, et enregistrées une nuit (à gauche) et le lendemain, à la fin du mois de décembre 2025.

La réflexion de la lumière dans les particules de glace en suspension dans l'atmosphère donnent parfois lieu à des phénomènes lumineux magnifiques entourant la Lune ou le Soleil (ci-dessous).

On les appelle respectivement parasélènes et parhélies.

www.cidehom.com/apod.php?_da...

3 months ago 40 11 4 0
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Tous mes vœux pour une très belle année haute en couleur !

📷 B. Valeur

3 months ago 7 0 0 0
Trees on a hilltop are seen in a starry sky but with clouds on the far horizon. A strange red circular band of light is seen in the sky. Near this band's center, some bright jellyfish like structures are visible. Please see the explanation for more detailed information.

Trees on a hilltop are seen in a starry sky but with clouds on the far horizon. A strange red circular band of light is seen in the sky. Near this band's center, some bright jellyfish like structures are visible. Please see the explanation for more detailed information.

🔭 Red Sprites and Circular Elves Lightning over Italy

Image Credit & Copyright: Valter Binotto

apod.nasa.gov/apod/ap25122...

4 months ago 257 77 5 7