9 - SCIENCE - JoanMira
La Science sous toutes ses formes/Science in all its forms
Nombre total de pages vues
16/07/2026
Géoglyphes - LE COLIBRI DE NAZCA
Astronomy - NGC 300 : A COSMIC GEMSTONE WITH STARS AND GAS CLOUDS
2026 July 16
Image Credit & Copyright: Team Ciel Austral
Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)
Explanation: This sparkling, colorful gemstone is a spiral galaxy, NGC 300. It is one of the closest spiral galaxies to Earth, only about 6 million light-years away. But does it really look like this? Here is a more standard portrait of it. This unusual image combines the light from the stars and dust within the galaxy with the light from ionized clouds of interstellar gas shown in red (Sulphur), green (Hydrogen) and blue (Oxygen). Combining red and green light in different proportions makes yellow or orange light, most visible in the image. Light from other ionized gases is also at work in neon signs, fluorescent tubes and street lights. These massive clouds of ionized gas are typically created by young, massive stars that produce high-energy ultraviolet radiation capable of ionizing the gas. Massive stars are short-lived, compared with lighter stars like our sun, and explode as supernovas at the end of their lives. Some of the colorful clouds in the image could be hiding supernova remnants.
14/07/2026
Astronomy - DOUBLE LOBED ASTEROID TORIFUNE
2026 July 14
Image Credit & Copyright: JAXA, U. of Tokyo, Chiba Tech, Tokyo U. of Science, AIST, Paris Obs., IAC
Explanation: Why is this asteroid a double? Earlier this month the Japanese robotic spacecraft Hayabusa2 shot past asteroid 98943 Torifune and captured pictures. Although previous observations from distant Earth indicated that Torifune was oblong, Hayabusa2 found that Torifune actually has two joined lobes. With a length of about four soccer fields, this space rock frequently comes near the Earth as it orbits the Sun, although it is not a threat. Besides the two lobes, Torifune shows many large boulders, but, surprisingly, no obvious craters, likely because its surface is a pile of rubble. Like asteroid Arrokoth, it appears that each lobe formed separately before colliding and becoming stuck together. Hayabusa2 famously encountered asteroid Ryugu in 2018, and now heads for an encounter in 2031 with 1998 KY26, a smaller asteroid that rotates unusually fast and might have reservoirs of ice.
13/07/2026
Astronomie - ECLIPSE DU SOLEIL : 12 AOÛT 2026
11/07/2026
Géoglyphes - LE CHEVAL BLANC DE KILBURN EN ANGLETERRE
Astronomy - STARRY NIGHT II
2026 June 19
Image Credit & Copyright: Rodrigo Guerra, Original Painting: Vincent van Gogh
Explanation: Does this scene look familiar? It is a modern recreation of the famous painting Starry Night by Vincent van Gogh. Both the image and the painting depict a tall tree on the left, a crescent moon on the upper right, the planet Venus just to the right of the tree, a foreground horizon rising from left to right, and clouds above the horizon. Differences include that the photograph was taken in mid-April earlier this year in Cascavel, Brazil, while the painting was composed in Saint-Rémy-de-Provence, France, in 1889. The original Starry Night is considered by many to be one of the three most famous paintings in the world today and a statement about the wonders of the night sky. Today is (roughly) the anniversary of the morning that van Gogh saw the sky that he later painted in his version of Starry Night.
09/07/2026
Astronomy - THE RED GLOW OF THE COSMIC BAT NEBULA
2026 July 9
Image Credit & Copyright: Humbert Cédric
Text: Keighley Rockcliffe (NASA GSFC, UMBC CSST, CRESST II)
Explanation: This Cosmic Bat wishes you a happy Summerween! This mid-year celebration of Halloween transcends hemispheres, even though summer in the Northern hemisphere is winter in the South. Contrary to its eery aura, the Cosmic Bat Nebula (LDN 43), not to be confused with the Bat Nebula (NGC 6995), is a vibrant birthplace for stars. A bit of young starlight peeks through the dense clouds of gas and dust that make up the Cosmic Bat’s 12 lightyear wingspan. The ultraviolet light from the young stars energizes the nebula’s hydrogen gas, causing it to glow an ominous red. The jet of glowing hydrogen gas emerging from the bat’s head hints at the star formation hidden within.
07/07/2026
Géoglyphes - LES LIGNES DE NAZCA AU PEROU
Les géoglyphes de Nazca, encore appelés lignes de Nazca, sont de grandes figures tracées dans le désert de Nazca, dans le sud du Pérou. Réalisés pour la plupart entre -200 et 600 ap. J.-C., ils sont le fait de la civilisation Nazca, une culture pré-inca qui se développa entre 300 av. J.-C. et 800 de notre ère. On se perd en conjectures et spéculations parfois douteuses quant à la signification que ces figures avaient pour les Nazcas.
06/07/2026
Astronomy - DUELING BANDS OVER THE ATACAMA DESERT
2026 July 6
Image Credit & Copyright: Julien Looten
Explanation: What are these two bands in the sky? The more commonly seen band is on the left and is the central band of our Milky Way galaxy. Our Sun orbits in the disk of this spiral galaxy so that from inside, it appears as a band of comparable brightness all the way around the sky. The less commonly seen band, on the right, is zodiacal light -- sunlight reflected from dust orbiting the Sun in our Solar System. Zodiacal light is brightest near the Sun and so is best seen just before sunrise or just after sunset. On some evenings, this ribbon of zodiacal light can appear quite prominent. It was discovered only in this century that zodiacal dust was mostly expelled by comets that have passed near Jupiter. The featured image was captured about a year ago from the Atacama Desert in Chile.
05/07/2026
Astronomy - AR 4478 : GIANT SUNSPOT GROUP
2026 June 28
Image Credit & Copyright: Alfredo Vidal Pérez
Explanation: Right now, one of the largest sunspot groups in recent history is crossing the Sun. Active Region 4478 is not only big -- it's violent, showing tangled magnetic fields capable of throwing off huge clouds of particles into the Solar System. Some of these CMEs might impact the Earth. At the extreme, these solar storms could cause some Earth-orbiting satellites to malfunction, the Earth's atmosphere to slightly distort, and electrical power grids to surge. When impacting Earth's upper atmosphere, these particles can produce beautiful auroras. Pictured here, AR 4478 and its dark sunspots were captured in visible light a few days ago from Barcelona, Spain. Almost as large as AR 3664 was in 2024, the AR 4478 sunspot group is so big that it is visible just with glasses specially designed to view solar eclipses. This week, skygazing enthusiasts all over the globe will not only be tracking AR 4478 during the day -- but keenly watching night skies for its corresponding bright auroras.
Géoglyphes - LE COLIBRI DE NAZCA
Les géoglyphes de Nazca, encore appelés lignes de Nazca, sont de grandes figures tracées dans le désert de Nazca, dans le sud du Pérou. Ré...
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2026 January 1 Auroral Corona Image Credit & Copyright : Roi Levi Explanation: Cycle 25 solar maximum made 2025 a great year for ...
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2026 January 2 NanoSail-D2 Image Credit & Copyright : Ralf Vandebergh Explanation: In 2011, on January 20, NASA's NanoSail-D2 ...





