ASTRONOMY - The Gamma Cygni Nebula

 2022 June 18

The Gamma Cygni Nebula
Image Credit & Copyright: Min Xie, Chen Wu, Yizhou Zhang, and Benchu Tang

Explanation: Supergiant star Gamma Cygni is at the center of the Northern Cross. Near the plane of our Milky Way galaxy, that famous asterism flies high in northern summer night skies in the constellation Cygnus the Swan. Known by the proper name Sadr, Gamma Cygni also lies just below center in this telescopic skyscape, with colors mapped from both broadband and narrowband image data. The field of view spans about 3 degrees (six Full Moons) on the sky and includes emission nebula IC 1318 and open star cluster NGC 6910. Filling the upper part of the frame and shaped like two glowing cosmic wings divided by a long dark dust lane, IC 1318's popular name is understandably the Butterfly Nebula. Right of Gamma Cygni, are the young, still tightly grouped stars of NGC 6910. The distance to Gamma Cygni is around 560 parsecs or 1,800 light-years. Estimates for IC 1318 and NGC 6910 range from 2,000 to 5,000 light-years.

PHOTOGRAPHIE - Voie lactée sur le mont blanc

 

Voie lactée sur le mont blanc

Richard Mercier
Stelvision

ASTRONOMY - Good Morning Planets from Chile

 2022 June 17

Good Morning Planets from Chile
Image Credit & Copyright: Elke Schulz (Daniel Verschatse Observatory)

Explanation: On June 15, innermost planet Mercury had wandered about as far from the Sun as it ever gets in planet Earth's sky. Near the eastern horizon just before sunrise it stands over distant Andes mountain peaks in this predawn snapshot from the valley of Rio Hurtado in Chile. June's other morning planets are arrayed above it, as all the naked-eye planets of the Solar System stretch in a line along the ecliptic in the single wide-field view. Tilted toward the north, the Solar System's ecliptic plane arcs steeply through southern hemisphere skies. Northern hemisphere early morning risers will see the lineup of planets along the ecliptic at a shallower angle tilting toward the south. From both hemispheres June's beautiful morning planetary display finds the visible planets in order of their increasing distance from the Sun.

ASTRONOMY - Strawberry Supermoon from China

 2022 June 16

Strawberry Supermoon from China
Image Credit & Copyright: Jeff Dai (TWAN)

Explanation: There are four Full Supermoons in 2022. Using the definition of a supermoon as a Full Moon near perigee, that is within at least 90% of its closest approach to Earth in a given orbit, the year's Full Supermoon dates are May 16, June 14, July 13, and August 12. Full Moons near perigee really are the brightest and largest in planet Earth's sky. But size and brightness differences between Full Moons are relatively small and an actual comparison with other Full Moons is difficult to make by eye alone. Two exposures are blended in this supermoon and sky view from June 14. That Full Moon was also known to northern hemisphere skygazers as the Strawberry moon. The consecutive short and long exposures allow familiar features on the fully sunlit lunar nearside to be seen in the same image as a faint lunar corona and an atmospheric cloudscape. They were captured in skies over Chongqing, China.

ASTRONOMY - In the Heart of the Virgo Cluster

 2022 June 15

In the Heart of the Virgo Cluster
Image Credit & Copyright: Saulius Adomaitis

Explanation: The Virgo Cluster of Galaxies is the closest cluster of galaxies to our Milky Way Galaxy. The Virgo Cluster is so close that it spans more than 5 degrees on the sky - about 10 times the angle made by a full Moon. With its heart lying about 70 million light years distant, the Virgo Cluster is the nearest cluster of galaxies, contains over 2,000 galaxies, and has a noticeable gravitational pull on the galaxies of the Local Group of Galaxies surrounding our Milky Way Galaxy. The cluster contains not only galaxies filled with stars but also gas so hot it glows in X-rays. Motions of galaxies in and around clusters indicate that they contain more dark matter than any visible matter we can see. Pictured here, the heart of the Virgo Cluster includes bright Messier galaxies such as Markarian's Eyes on the upper left, M86 just to the upper right of center, M84 on the far right, as well as spiral galaxy NGC 4388 at the bottom right.

ASTRONOMY - Satellites Behind Pinnacles

 2022 June 14

Satellites Behind Pinnacles
Image Credit & Copyright: Joshua Rozells

Explanation: What are all those streaks across the background? Satellite trails. First, the foreground features picturesque rock mounds known as Pinnacles. Found in the Nambung National Park in Western Australia, these human-sized spires are made by unknown processes from ancient sea shells (limestone). Perhaps more eye-catching, though, is the sky behind. Created by low-Earth orbit satellites reflecting sunlight, all of these streaks were captured in less than two hours and digitally combined onto the single featured image, with the foreground taken consecutively by the same camera and from the same location. Most of the streaks were made by the developing Starlink constellation of communication satellites, but some are not. In general, the streaks are indicative of an increasing number of satellites nearly continuously visible above the Earth after dusk and before dawn. Understanding and removing the effects of satellite trails on images from Earth's ground-based cameras and telescopes is now important not only for elegant astrophotography, but for humanity's scientific understanding of the distant universe.

SANTé/MEDECINE - Où doit-on jeter les emballages de médicaments?

Boîtes en carton et notices en papier sont à jeter dans la poubelle de tri sélectif. Seuls les emballages qui sont directement en contact avec les médicaments sont à rapporter à la pharmacie. Petite précision : les pharmaciens reprennent tous les médicaments qui restent dans l'armoire à pharmacie, qu'ils soient périmés ou non. Il est très important de les rapporter au pharmacien et de ne pas les jeter à la poubelle ou dans les toilettes car ce sont des produits à base de substances chimiques actives qui peuvent polluer l'environnement. Le pharmacien les remettra au réseau Cyclamed, qui assurera leur valorisation.

TopSanté

ASTRONOMY - M51: The Whirlpool Galaxy from Hubble

 2022 June 13

M51: The Whirlpool Galaxy from Hubble
Image Credit: NASA, ESA, Hubble, HLA; Processing & Copyright: Bernard Miller

Explanation: The Whirlpool Galaxy is a classic spiral galaxy. At only 30 million light years distant and fully 60 thousand light years across, M51, also known as NGC 5194, is one of the brightest and most picturesque galaxies on the sky. The featured image is a digital combination of images taken in different colors by the Earth-orbiting Hubble Space Telescope, highlighting many sharp features. Anyone with a good pair of binoculars, however, can see this Whirlpool toward the constellation of the Hunting Dogs (Canes Venatici). M51 is a spiral galaxy of type Sc and is the dominant member of a whole group of galaxies. Astronomers speculate that M51's spiral structure is primarily due to its gravitational interaction with the smaller galaxy on the image left.

MERVEILLEUX MONDE SOUS-MARIN - L'aurélie, la méduse commune

Mer Rouge : Région de Marsa Alam

Méduse aurélie (Aurelia aurita). Le diamètre de son ombrelle peut mesurer jusqu'à 40 centimètres. On distingue autour des centaines de petites tentacules.

Cette espèce vit dans toutes les mers du globe, elle est pélagique mais se rencontre aussi près des côtes.

Les animaux marins, et notamment les tortues et les dauphins qui se nourrisent de méduses confondent parfois les sacs en plastique avec elles, et s'étouffent. Cette forme de pollution est donc dangereuse pour la vie sauvage.

© Alexis Rosenfeld

FuturaSciences

ASTRONOMY - Find the Man in the Moon

 2022 June 12

Find the Man in the Moon
Image Credit & Copyright: Dani Caxete

Explanation: Have you ever seen the Man in the Moon? This common question plays on the ability of humans to see pareidolia -- imagining familiar icons where they don't actually exist. The textured surface of Earth's full Moon is home to numerous identifications of iconic objects, not only in modern western culture but in world folklore throughout history. Examples, typically dependent on the Moon's perceived orientation, include the Woman in the Moon and the Rabbit in the Moon. One facial outline commonly identified as the Man in the Moon starts by imagining the two dark circular areas -- lunar maria -- here just above the Moon's center, to be the eyes. Surprisingly, there actually is a man in this Moon image -- a close look will reveal a real person -- with a telescope -- silhouetted against the Moon. This featured well-planned image was taken in 2016 in Cadalso de los Vidrios in Madrid, Spain. Do you have a favorite object that you see in the Moon?