Cometa Ison a supravietuit apropierea de soare – Comet Ison’s full swing around the sun – Coplesit de Creatia lui Dumnezeu

Photo credit http://earthsky.org Fa click pe poza sa o maresti.

Cometa ISON a supravieţuit trecerii sale pe lângă Soare, joi, şi a fost denumită „cometa zombie” de către astronomii americani, care consideră că acest corp ceresc neobişnuit „s-a întors dintre morţi”.

Trecerea cometei ISON pe lângă Soare s-a produs cu o viteză uluitoare, care a atins 1,4 milioane de kilometri pe oră. Concluziile iniţiale ale experţilor indicau faptul că ISON, un bulgăr uriaş de gheaţă şi praf stelar, venit de la marginea Sistemului Solar, nu a supravieţuit temperaturilor de câteva mii de grade Celsius în timpul apropierii de Soare şi că acest corp ceresc s-a dezintegrat.

Vineri, însă, spre surpriza specialiştilor, o pată strălucitoare şi-a făcut apariţia pe imaginile captate de sonda Soho, exact în locul în care era aşteptată traiectoria cometei ISON.

„Nu ştim deocamdată dacă este vorba de resturi rămase din cometă sau dacă o parte din nucleul cometei a supravieţuit”, afirmă NASA. Analizele preliminare sugerează faptul că cel puţin o parte din nucleul cometei ISON este intact. Deocamdată este prea devreme pentru ca astronomii să poată spune dacă ISON a rămas intactă sau a fost fragmentată şi să indice procentul din masa iniţială care a fost conservat, dar, în orice caz, masa rămasă este suficientă pentru a forma un nucleu cu o activitate vizibilă.

Sursa: http://www.mediafax.ro Vezi mai multe faze cu apropierea de soare, imagini capturate de diferite telescoape NASA, din diferite unghiuri. Cometa o veti vedea venind din partea dreapta, jos a ecranului, va inconjura soarele si se va reintoarce.

ENGLISH:

After several days of continued observations, scientists continue to work to determine and to understand the fate of Comet ISON: There’s no doubt that the comet shrank in size considerably as it rounded the sun and there’s no doubt that something made it out on the other side to shoot back into space. The question remains as to whether the bright spot seen moving away from the sun was simply debris, or whether a small nucleus of the original ball of ice was still there. Regardless, it is likely that it is now only dust.

Comet ISON, which began its journey from the Oort Cloud some 3 million years ago, made its closest approach to the sun on Nov. 28, 2013. The comet was visible in instruments on NASA’s Solar Terrestrial Relations Observatory, or STEREO, and the joint European Space Agency/NASA Solar and Heliospheric Observatory, or SOHO, via images called coronagraphs. Coronagraphs block out the sun and a considerable distance around it, in order to better observe the dim structures in the sun’s atmosphere, the corona. As such, there was a period of several hours when the comet was obscured in these images, blocked from view along with the sun. During this period of time, NASA’s Solar Dynamics Observatory could not see the comet, leading many scientists to surmise that the comet had disintegrated completely. However, something did reappear in SOHO and STEREO coronagraphs some time later – though it was significantly less bright.
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Whether that spot of light was merely a cloud of dust that once was a comet, or if it still had a nucleus – a small ball of its original, icy material – intact, is still unclear. It seems likely that as of Dec. 1, there was no nucleus left. By monitoring its changes in brightness over time, scientists can estimate whether there’s a nucleus or not, but our best chance at knowing for sure will be if the Hubble Space Telescope makes observations later in December 2013.
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Regardless of its fate, Comet ISON did not disappoint researchers. Over the last year, observatories around the world and in space gathered one of the largest sets of comet observations of all time, which should provide fodder for study for years to come. The number of space-based, ground-based, and amateur observations were unprecedented, with twelve NASA space-based assets observing over the past year.

Source NASA.gov

In Awe of God’s Creation – AUDIO – Cum se aude zgomotul universului? What does space sound like? Coplesit de Creatia lui Dumnezeu

Photo credit http://www.dailygalaxy.com Pillars of Creation – Stalpii Creatiei

From the University of Leicester (http://www.le.ac.uk) via www.alphagalileo.org

Far from the booming space battles and roaring warp drives of blockbuster movies, we think of the airless immensity of outer space as being as quiet as it is empty—but it is, in fact, as noisy as anywhere on Earth. But what kind of noise is this? To try and answer that question with his installation, Andrew Williams gathered sounds and data from space—including recordings made by satellites and long-wave radios.

The sound for the installation comes from two main sources:

  • Electrons hitting the Earth’s upper atmosphere – recorded using Long Wave Radio by Cluster II satellite on the 9th of July 2001. The recording is entitled Chorus. The title comes from the brief, rising-frequency tones caused by the impacts of electrons, which sound like a chorus of birds singing.
  • A deep pulsing sound emanating from the Sun, recorded by the European Space Agency Soho spacecraft and caused by bubbles emanating from deep within the star.

The unique project involves projecting the sounds through multiple speakers and also features projections of still images and videos on multiple screens.

Trajectory will develop over the two days—immersing visitors in the artist’s vision of Earth, and space, as well as an exploration of current research and future challenges for humanity.

As well as Earth’s relationship with the sun and “space weather”—the kind of phenomena that produced the sounds—Andrews’s installation explores the history of our relationship with space from Sputnik to the present day. To create the visual imagery for the show Andrew tracked the trajectories of 250 satellites that are looking at the Earth.

Andrew said: “The installation itself looks at several aspects of space in detail, whilst also providing an opportunity to reflect upon the future in terms of future space research, the effects of space research upon our lives and the big question – the future of humanity. No answers are provided, of course!

“The sound is what inspired me – once I had started to create audio from space data I wanted to find a way of presenting it. Much of the data comes from Satellites (in particular Cluster II) and it seemed natural to find the exact location of this when the data was collected. I then realised that the trajectories of satellites created a transfixing and beautiful visual landscape. It also shows how much—or little—of space we currently colonise.”

Andrew Williams became one of the University’s Artists in Residence in 2012, and began a mission with the Space Research Centre to explore new ways of presenting and explaining scientific research to the public.

ROMANIAN:

Andrew Williams de la Centrul de Cercetări Spaţiale din Leicester a folosit datele colectate de sateliţi şi de navete spaţiale pentru a genera sunetul pe care l-am auzi dacă am regla un radio în timp ce ne-am afla în spaţiu.

Cea mai impresionantă realizare a cercetătorului este „Chorus”, o înregistrare ce surprinde zgomotul făcut de electroni în timp ce lovesc atmosfera superioară a Pământului. Sunetul produs de acest fenomen se aseamănă cu cel făcut de nişte grauri aflaţi deasupra unui pârâu.

Sunetul a fost înregistrat de satelitul Cluster II în 2001 folosind un receptor de bandă largă. Williams afirmă că sunete erau în afara spectrului auzului uman, astfel că a fost nevoit să reducă înălţimea sunetelor şi să le filtreze pentru ca oamenii să le poată auzi. (Traducerea via Descopera.ro)

CHORUS 1

CHORUS consists of brief tones which sounds like a chorus of birds at daybreak created when electrons hit the Earth’s atmosphere. This new audio composition has been created for the Trajectory Installation at Leicester University by Andrew Williams. It makes use of data collected by the Cluster 2 Satelite in 2001 using LWR (long wave radio) Through a process of transposition and filtering the signal (which are naturally outside of the range of human hearing) the tones become audible. Andrew has shaped the material and developed a performance structure using a multi speaker difussion system to recreate the spatial qualities of the Earth Chorus within the gallery space. Andrew is Leverhulme Artist in Residence at the Space Research Centre, Leicester University.

VIDEO by Andrew Williams

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