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#nasa #apodAnimation: Black Hole Destroys Star
27 April 2021 – Video Illustration Credit: DESY, Science Communication Lab
Explanation: What happens if a star gets too close to a black hole? The black hole can rip it apart – but how? It’s not the high gravitational attraction itself that’s the problem – it’s the difference in gravitational pull across the star that creates the destruction. In the featured animated video illustrating this disintegration, you first see a star approaching the black hole. Increasing in orbital speed, the star’s outer atmosphere is ripped away during closest approach. Much of the star’s atmosphere disperses into deep space, but some continues to orbit the black hole and forms an accretion disk. The animation then takes you into the accretion disk while looking toward the black hole. Including the strange visual effects of gravitational lensing, you can even see the far side of the disk. Finally, you look along one of the jets being expelled along the spin axis. Theoretical models indicate that these jets not only expel energetic gas, but create energetic neutrinos – one of which may have been seen recently on Earth.
Explication : Que se passe-t-il si une étoile s’approche trop près d’un trou noir ? Le trou noir peut la mettre en pièces, mais comment ? Ce n’est pas la forte attraction gravitationnelle elle-même qui pose problème, mais la différence de force gravitationnelle entre les deux étoiles qui provoque la destruction. Dans la vidéo illustrant cette désintégration, on voit d’abord une étoile s’approcher du trou noir. La vitesse orbitale de l’étoile augmente et son atmosphère extérieure est arrachée au moment où elle se rapproche le plus. Une grande partie de l’atmosphère de l’étoile est projetée dans l’espace, mais une autre continue à tourner autour du trou noir et constitue un disque d’accrétion. L’animation vous emmène ensuite dans le disque d’accrétion tout en regardant vers le trou noir. Grâce aux étranges effets visuels de la lentille gravitationnelle, vous pouvez même voir la face cachée du disque. Pour finir, vous voyez l’un des jets expulsés le long de l’axe de rotation. Les modèles théoriques indiquent que ces jets expulsent non seulement des gaz énergétiques, mais créent également des neutrinos énergétiques, dont l’un a peut-être été observé récemment sur Terre.
Traduit avec www.DeepL.com/Translator (version gratuite)APOD: 2021 April 27 - Animation: Black Hole Star Shredder
A different astronomy and space science related image is featured each day, along with a brief explanation.apod.nasa.gov
A different astronomy and space science related image is featured each day, along with a brief explanation.apod.nasa.gov
#nasa #apodFlying Over the Earth at Night II
23 April 2021 – Video Credit: NASA, Gateway to Astronaut Photography, ISS Expedition 53; Music: The Low Seas (The 126ers)
Explanation: Recorded during 2017, timelapse sequences from the International Space Station are compiled in this serene video of planet Earth at Night. Fans of low Earth orbit can start by enjoying the view as green and red aurora borealis slather up the sky. The night scene tracks from northwest to southeast across North America, toward the Gulf of Mexico and the Florida coast. A second sequence follows European city lights, crosses the Mediterranean Sea, and passes over a bright Nile river in northern Africa. Seen from the orbital outpost, erratic flashes of lightning appear in thunder storms below and stars rise above the planet’s curved horizon through a faint atmospheric airglow. Of course, from home you can always check out the vital signs of Planet Earth Now.
Explication : Enregistrées au cours de l’année 2017, les séquences en time-lapse de la Station spatiale internationale sont compilées dans cette vidéo sereine de la planète Terre la nuit. Les fans de l’orbite terrestre basse peuvent commencer par apprécier la vue des aurores boréales vertes et rouges qui recouvrent le ciel. La scène nocturne traverse l’Amérique du Nord du nord-ouest au sud-est, en direction du golfe du Mexique et de la côte de la Floride. Une deuxième séquence suit les lumières des villes européennes, traverse la mer Méditerranée et passe au-dessus du Nil en Afrique du Nord. Vu depuis l’avant-poste orbital, des éclairs erratiques apparaissent dans les orages en dessous et les étoiles s’élèvent au-dessus de l’horizon incurvé de la planète à travers une faible lueur atmosphérique. Bien sûr, de chez vous, vous pouvez toujours vérifier les signes vitaux de la planète Terre maintenant.
Traduit avec www.DeepL.com/Translator (version gratuite)APOD: 2021 April 23 - Flying Over the Earth at Night II
A different astronomy and space science related image is featured each day, along with a brief explanation.apod.nasa.gov
A different astronomy and space science related image is featured each day, along with a brief explanation.apod.nasa.gov
Das ist die Transkription einer Folge meines Sternengeschichten-Podcasts. Die Folge gibt es auch als MP3-Download und YouTube-Video. Und den ganzen Podcast findet ihr auch bei Spotify. Mehr Informa…
Der erste Weltraumflug eines wiederverwendbaren Raumfahrzeugs begann auf den Tag genau vor 40 Jahren – anders als sonst direkt mit einer Crew an Bord.www.heise.de
The insane engineering of the Perseverance rover. Instead of having instruments for determining the chemical composition of the Martian soil, the system stores sample tubes where they will be transferred to a spot where a future rover will retrieve them in 2026, transferring them to a return rocket that will bring them to orbit, where they will be transferred to another spacecraft that will return the Martian soil back to Earth.
Instead of having a mass spectrometer, a gas chromatograph, and a tunable laser spectrometer, which the Curiosity rover had, Perseverance has Raman spectroscopy, luminescent spectroscopy using UV light, an x-ray laser, and ground penetrating radar that can see 10 meters under the surface.
In addition, Perseverance has a system to make oxygen from the atmosphere's CO2. Not something the rover needs, but something future humans will need, so this rover will test the technology. It also has a helicopter. It can only fly for about 90 seconds, so it's really also a technology test, but if it works, it will lead to future Mars helicopters with science missions.
#nasa #mars #perseverance
Less than a day after NASA’s Mars 2020 Perseverance rover successfully landed on the surface of Mars, engineers and scientists at the agency’s Jet Propulsion Laboratory in Southern California were hard at work, awaiting the next transmissions from Perseverance.www.nasa.gov
#NASA sendet #Marslandung im #Live-Stream
Von Ulrich Bantle - 18. Februar 2021
Die amerikanische Weltraumbehörde NASA überträgt die für den heutigen Donnerstag gegen 22 Uhr geplante Landung des Rovers Perseverance auf dem Mars in Live-Streams. Die Übertragung beginne dann bereits um 20.15 Uhr bei NASA-TV.
Perseverance war im Juli 2020 gestartet und soll am heutigen Donnerstag um 21.38 Uhr mit dem Landemanöver beginnen, indem er sich vom Antriebsmodul abkoppelt. Um 21.48 Uhr treffe Perseverance auf die Mars-Atmosphäre. Der Rover sei dann mit rund 19.500 Stundenkilometer unterwegs, teilt die NASA mit. Durch die Reibung in der Atmosphhäre heizen sich die Schutzschilde des Rovers in kurzer Zeit auf rund 1300 Grad auf. Die Bremswirkung setzt ein. Der Bremsfallschirm öffne sich um 21.52 Uhr, Perseverance sei dann immer noch mit Überschallgeschwindigkeit unterwegs. 20 Sekunden nachdem der Bremsfallschirm sich geöffnet hat, stößt der Rover die Hitzeschilde ab. Er sei dann in der Lage, mittels Radar die Entfernung zum Mars zu messen und durch den Einsatz seiner Terrain-Relative Navigation einen geeigneten Landepunkt zu wählen. Um 21.55 Uhr soll der Rover im Jezero Krater auf dem Mars landen. Er soll dann nur noch in Schrittgeschwindigkeit unterwegs sein. Die Landung kann laut der NASA gänzlich ohne Kommunikation zwischen Rover und Erde erfolgen.
Eine der ersten Aufgaben nach einer erfolgreichen Landung des Rovers sei die Übertragung von Fotos seines Standorts an die Erde. In den folgenden Tagen sind weitere Experimente geplant. Perseverance soll unter anderem nach Spuren von Leben suchen. Bei der NASA-Webseite zur Landung sind die möglichen Streams und Youtube-Kanäle verlinkt.
Source: https://www.linux-magazin.de/news/nasa-sendet-marslandung-im-live-stream/
and: https://mars.nasa.gov/mars2020/timeline/landing/watch-online/
#EarthObservatory #NASA #MountFuji #Japan #SnowMount Fuji’s Missing Snow
https://earthobservatory.nasa.gov/images/147780/mount-fujis-missing-snow
Even as record snowfall has clobbered Japan’s western coast, much of the country’s eastern half has avoided major snow accumulation this winter. Notably, Mount Fuji’s iconic snow cap—which is normally visible throughout December—has been small or absent this year.
The mountain peak, the tallest in Japan, did get a dusting on September 28, 2020, its first snowfall of the year. But that melted off quickly, and Fuji’s snow cap remained elusive in the coming months. Normalized Difference Snow Index (NDSI) observations from NASA’s Terra satellite indicate that snow cover on the mountain last month was among the lowest in the satellite's 20-year record for any December.
Ground-based weather stations made similar observations. “Stations around Mount Fuji recorded much less precipitation than usual in December,” said Toshio Iguchi, a remote sensing scientist based at NASA’s Goddard Space Flight Center. “Through December 24, it was only 10 percent of an average year.” Weather data also indicate that temperatures around the mountain were warm during much of December.
In the images at the top of the page, the bare upper slopes of the mountain were visible to the Operational Land Imager (OLI) on the Landsat 8 satellite on January 1, 2021. For comparison, the other image, also acquired by OLI, shows Mount Fuji on December 29, 2013, on a day it was snowier. The mountain had a slightly above average amount of snow in December 2013, according to the Terra NDSI observations.
Toward the end of December 2020, the mountain finally received some snow. But even chillier January weather did not guarantee that the snow cap would last. After a few days, the snow cap was much reduced as temperatures creeped above freezing. And part of the snow cap was likely blown away by wind, according to Weather News.
While local weather conditions are key to whether Fuji’s snow cap is present on any given day, long-term climate data indicates that conditions on the peak are changing. One recent study found the mountain’s timberline had moved upslope by 30 meters (100 feet) over the past four decades, likely due to a 2 degree Celsius (3.6 degrees Fahrenheit) increase in summer temperatures near the peak.
NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Survey and MODIS data from the National Snow and Ice Data Center. Story by Adam Voiland.Mount Fuji’s Missing Snow
The lack of snow cover in December left Japan’s iconic mountain looking a little different than usual.earthobservatory.nasa.gov
#EarthObservatory #NASA #MountFuji #Japan #SnowMount Fuji’s Missing Snow
https://earthobservatory.nasa.gov/images/147780/mount-fujis-missing-snow
Even as record snowfall has clobbered Japan’s western coast, much of the country’s eastern half has avoided major snow accumulation this winter. Notably, Mount Fuji’s iconic snow cap—which is normally visible throughout December—has been small or absent this year.
The mountain peak, the tallest in Japan, did get a dusting on September 28, 2020, its first snowfall of the year. But that melted off quickly, and Fuji’s snow cap remained elusive in the coming months. Normalized Difference Snow Index (NDSI) observations from NASA’s Terra satellite indicate that snow cover on the mountain last month was among the lowest in the satellite's 20-year record for any December.
Ground-based weather stations made similar observations. “Stations around Mount Fuji recorded much less precipitation than usual in December,” said Toshio Iguchi, a remote sensing scientist based at NASA’s Goddard Space Flight Center. “Through December 24, it was only 10 percent of an average year.” Weather data also indicate that temperatures around the mountain were warm during much of December.
In the images at the top of the page, the bare upper slopes of the mountain were visible to the Operational Land Imager (OLI) on the Landsat 8 satellite on January 1, 2021. For comparison, the other image, also acquired by OLI, shows Mount Fuji on December 29, 2013, on a day it was snowier. The mountain had a slightly above average amount of snow in December 2013, according to the Terra NDSI observations.
Toward the end of December 2020, the mountain finally received some snow. But even chillier January weather did not guarantee that the snow cap would last. After a few days, the snow cap was much reduced as temperatures creeped above freezing. And part of the snow cap was likely blown away by wind, according to Weather News.
While local weather conditions are key to whether Fuji’s snow cap is present on any given day, long-term climate data indicates that conditions on the peak are changing. One recent study found the mountain’s timberline had moved upslope by 30 meters (100 feet) over the past four decades, likely due to a 2 degree Celsius (3.6 degrees Fahrenheit) increase in summer temperatures near the peak.
NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Survey and MODIS data from the National Snow and Ice Data Center. Story by Adam Voiland.
The lack of snow cover in December left Japan’s iconic mountain looking a little different than usual.earthobservatory.nasa.gov
Fly me to the Moon, let me swim among the starswww.theregister.com
Ambitious series of joint missions aims to construct a crewed space station that will orbit the moonwww.theguardian.com
#Mars #planete #science #technologie #technology #rover #nasa
Une petite promenade sur la planète rouge, ça te dit??
époustouflant hein??
enjoy :D
Ten years of the #Sun in one hour – #Nasa releases mesmerising #space #film | #Science | The Guardian
https://www.theguardian.com/science/2020/jul/01/ten-years-of-the-sun-in-one-hour-nasa-releases-mesmerising-space-film
#Astronomy #PhysicsTen years of the sun in one hour – Nasa releases mesmerising space film
The space agency gathered 425 million high-resolution images of the sun, which have now been stitched together to form the videowww.theguardian.com
The space agency gathered 425 million high-resolution images of the sun, which have now been stitched together to form the videowww.theguardian.com
Russian space agency chief Dmitry Rogozin once ridiculed the lack of a U.S. manned flight programme, saying it might as well "deliver its astronauts to the ISS by using a trampoline".(c) Photo: MK
Six years later Elon Musk and NASA had the last laugh.
"The trampoline is working," quipped the 48-year-old U.S. entrepreneur at a post-flight news conference alongside NASA administrator Jim Bridenstine.
Both men laughed. "It's an inside joke," Musk added.
On Saturday, his SpaceX made history by becoming the first commercial company to send humans into orbit.
The U.S. feat and Musk's joke set Russian social media alight, with wits ridiculing Rogozin, and the Russian space chief's name began trending on Twitter.
"How do you like this, Dmitry Rogozin?" one critic prodded.
Russia still prides itself on sending the first human into orbit in 1961 and other achievements of the Soviet-era space programme.
Rogozin has remained conspicuously silent but his spokesman was forced to react.
"We don't really understand the hysteria sparked by the successful launch of a Crew Dragon spacecraft," spokesman Vladimir Ustimenko said on Twitter.
"What should have happened a long time ago happened," he added.
While cosmonaut Sergei Krikalev, Roscosmos executive director for crewed space programmes, saluted the US achievement in a brief video address, not everyone was in such a gracious mood.
Alexey Pushkov, a member of the upper house of parliament, declared Saturday's flight was not a big deal.
"This is a flight to the International Space Station, not to Mars," he said on messaging app Telegram.
He pronounced it time to stop ferrying Americans to the orbiting lab.
"Russia needs spaces for its own young cosmonauts."
https://www.themoscowtimes.com/2020/05/31/trampoline-is-working-musk-taunts-russia-a70433
Abell 2384: Bending the Bridge Between Two Galaxy Clusters
#nasa #photo #photography #space
posted by pod_feeder_v2Abell 2384: Bending the Bridge Between Two Galaxy Clusters
Several hundred million years ago, two galaxy clusters collided and then passed through each other.www.nasa.gov
Several hundred million years ago, two galaxy clusters collided and then passed through each other.www.nasa.gov
30 Years of the Hubble Space Telescope
#nasa #photo #photography #space
posted by pod_feeder_v230 Years of the Hubble Space Telescope
On April 25, 1990, the Hubble Space Telescope was deployed from the cargo bay of space shuttle Discovery.www.nasa.gov
On April 25, 1990, the Hubble Space Telescope was deployed from the cargo bay of space shuttle Discovery.www.nasa.gov
