ASTRONOMY - A Partial Eclipse of an Active Sun

2022 November 2

A Partial Eclipse of an Active Sun
Video Credit: Ralf Burkart; h/t Maciej Libert (AG)

Explanation: Watch for three things in this unusual eclipse video. First, watch for a big dark circle to approach from the right to block out more and more of the Sun. This dark circle is the Moon, and the video was made primarily to capture this partial solar eclipse last week. Next, watch a large solar prominence hover and shimmer over the Sun's edge. A close look will show that part of it is actually falling back to the Sun. The prominence is made of hot plasma that is temporarily held aloft by the Sun's changing magnetic field. Finally, watch the Sun's edge waver. What is wavering is a dynamic carpet of hot gas tubes rising and falling through the Sun's chromosphere -- tubes known as spicules. The entire 4-second time-lapse video covers a time of about ten minutes, although the Sun itself is expected to last another 5 billion years. 

ASTRONOMY - Night on a Spooky Planet

2022 October 30

Night on a Spooky Planet
Image Credit & Copyright: Stéphane Vetter (Nuits sacrées)

Explanation: What spooky planet is this? Planet Earth of course, on a dark and stormy night in 2013 at Hverir, a geothermally active area along the volcanic landscape in northeastern Iceland. Triggered by solar activity, geomagnetic storms produced the auroral display in the starry night sky. The ghostly towers of steam and gas are venting from fumaroles and danced against the eerie greenish light. For now, auroral apparitions are increasing as our Sun approaches a maximum in its 11 year solar activity cycle. And pretty soon, ghostly shapes may dance in your neighborhood too. 

ASTRONOMY - LDN 43: The Cosmic Bat Nebula

 2022 October 31

LDN 43: The Cosmic Bat Nebula
Image Credit & Copyright: Mark Hanson and Mike Selby; Text: Michelle Thaller (NASA's GSFC)

Explanation: What is the most spook-tacular nebula in the galaxy? One contender is LDN 43, which bears an astonishing resemblance to a vast cosmic bat flying amongst the stars on a dark Halloween night. Located about 1400 light years away in the constellation Ophiuchus, this molecular cloud is dense enough to block light not only from background stars, but from wisps of gas lit up by the nearby reflection nebula LBN 7. Far from being a harbinger of death, this 12-light year-long filament of gas and dust is actually a stellar nursery. Glowing with eerie light, the bat is lit up from inside by dense gaseous knots that have just formed young stars.

ASTRONOMY - Seven Years of Halley Dust

 2022 October 28

Seven Years of Halley Dust
Image Credit & Copyright: Petr Horalek / Institute of Physics in Opava

Explanation: History's first known periodic comet Halley (1P/Halley) returns to the inner Solar System every 75 years or so. The famous comet made its last appearance to the naked-eye in 1986. But dusty debris from Comet Halley can be seen raining through planet Earth's skies twice a year during two annual meteor showers, the Eta Aquarids in May and the Orionids in October. Including meteors near the shower maximum on October 21, this composite view compiles Orionid meteors captured from years 2015 through 2022. About 47 bright meteors are registered in the panoramic night skyscape. Against a starry background extending along the Milky Way, the Orionid meteors all seem to radiate from a point just north of Betelgeuse in the familiar constellation of the Hunter. In the foreground are mountains in eastern Slovakia near the city of Presov.

ASTRONOMIE - Comprendre Mars

La planète rouge est considérée par certains experts comme une solution potentielle à la survie de l'humanité. Mais connaissez-vous réellement cette planète ?

ASTRONOMY - Sunset, Moonset, Taj Mahal

 2022 October 27

Sunset, Moonset, Taj Mahal
Image Credit & Copyright: Neelam and Ajay Talwar (TWAN)

Explanation: On October 25th, Sun and New Moon set together as seen from Agra, India. Their close conjunction near the western horizon, a partial solar eclipse, was captured in this elevated view in hazy skies near the solitary dome of the Taj Mahal. Of course, the partial solar eclipse was also seen from most of Europe, northern Africa, the Middle East, and western parts of Asia. This eclipse was the last of two solar eclipses (both partial eclipses) in 2022. But the next Full Moon will slide through planet Earth's shadow on November 7/8, in a total lunar eclipse.

MICROPHOTOGRAPHIE - Granulite et graphite

 

Granulite comportant du graphite. La granulite est une roche métamorphique composée de quartz et de feldspath. L'échantillon provient de l'État de Kerala, au sud ouest de l'Inde. Image réalisée en lumière polarisée. Grossissement 2,5x.

Dr. Bernardo Cesare

Département de géosciences, Padoue, Italie

FuturaSciences

MACROPHOTOGRAPHIE - Miki Asai - En attendant que vienne une fourmi

La photographe japonaise Miki Asai a choisi la macrophotographie pour révéler à nos yeux ce que la nature a l'habitude de nous dissimuler avec pudeur. Ainsi, elle se refuse à manipuler les insectes qu'elle prend pour modèles. Au lieu de cela, elle prône la patience. Elle peut parfois attendre ainsi plusieurs heures que la scène parfaite se dessine sous son objectif.

FuturaSciences

AVIATION IMAGINEE - La voiture volante individuelle

Hildebrands, une célèbre marque de chocolat allemand dans les années 1900, nous imaginait chacun en possession d'une voiture volante. Ces dessins suggèrent différents types d'appareils, allant des ailes de chauve-souris à la baignoire surmontant quatre ailes improbables. Ils nous font aujourd'hui sourire par leur optimisme mais sont surtout révélateurs de l'époque des pionniers de l'aviation qui laissait présager un futur aérien...

© Hildebrands

FuturaSciences

ASTRONOMIE - Mars arrive !

Bien visible à l’œil nu, Mars est sans doute le monde planétaire qui excite le plus notre imaginaire. Observable tous les deux ans, elle est au plus près de nous le 8 décembre 2022 et s’observe facilement tout le long de l’automne 2022 et de l’hiver 2023

Stelvision