| |
| Piú viste - Deep Sky Objects |
Sagittarius~0.jpgThe "Sagittarius' Dwarf Tidal Stream"117 visiteDa "NASA - Picture of the Day" del 29 Maggio 2005:"Recent 'Wide Field Images' and analyses indicate that our home galaxy is actually still in the process of devouring one of its closer satellite neighbors.
This unfortunate neighbor, the Sagittarius Dwarf Galaxy, is now seen to be part of a larger Sagittarius Tidal Stream, a loose filament of stars, gas, and possibly dark matter that entangles the Milky Way. Speculation also holds that the Sagittarius Dwarf was once pulled through the Milky Way disk very close to our Sun's current location. An important resulting realization is that galaxies contain a jumble of clumps and filaments of both dim and dark matter".
Che sia questo residuo di onda mareale - o forse si tratta di un corpo oscuro 'dimenticato'? - la causa delle strane ed apparentemente inspiegabili accelerazioni e decelerazioni del Voyager, ormai giunto agli estremi confini dell'area di influenza mareale del Sole?
O forse non poi cos facile riuscire a "mollare gli ormeggi solari"?...
|
|
LDN-0043_The_Bat_Nebula.jpgThe "Bat Nebula" (Image Credit & Copyright: Humbert Cédric)117 visiteThis 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 withinMareKromium
|
|
NGC-6543-1.jpgNGC 6543 "Cat's Eye"116 visite"Se un gatto ci guarda, allora ci sentiamo osservati, scrutati, forse - talvolta - anche pesati e valutati. Reggere lo sguardo intenso di un gatto è difficile ed anche le azioni più ordinarie sono svolte in modo diverso, quando sappiamo che un gatto ci osserva.
Noi, invece, possiamo fissare un gatto a lungo, cercando di infastidirlo o di farci notare, ma lui continuerà a leccarsi il pelo o ad osservare una mosca che danza sulla finestra o a riposare: i nostri giudizi, per il gatto, non hanno peso alcuno"
Paolo C. Fienga
|
|
IC-3568.jpgIC 3568116 visite"Everything that moves, serves to interest and amuses a cat..."
F.A. Paradis De Moncrof
|
|
IC_5067.jpgIC 5067 in the "Pelican Nebula"116 visite"...Quod quis crebro videt non mirantur, etiamsi cur fiat nescit..."
(Cicerone)
"...Quello che vediamo (in vero) non ci sorprende, anche se non sappiamo perché accade..." (trad. libera)MareKromium
|
|
Tachyons-4.jpgTime, Space and Light-Cones116 visiteSimultaneous is not simultaneous. Space and Time do not exist. These, and other strange and wonderful things, are the hallmarks of Einsteins' Theory of Relativity. Something cant move through Space without moving through Time as well (note: simultaneously!). The Theory of Relativity dispenses with Time and Space, and instead describes a new thing called Spacetime.
Imagine a train moving in a straight line Eastward. We can map its movement through Space, Time or, best of all, Spacetime! With a simple Spacetime graph, we map Space horizontally and Time vertically. In the real World, there are three Dimensions of Space length, width and height. Thankfully, theere is only one Dimension of Time, and it runs from the Past to the Future (unless youre looking backwards.) To graph something using all four dimensions is hard, so instead we just take two Dimensions of Space and make a horizontal plane, then map Time vertically.
Now imagine a flash of light. Say you were standing on a hill on a moonless night and turned on a torch for a second. The light would spread out in every direction, lighting first the bushes near by, then later the trees in the distance. If we think about it in just 2 dimensions we can draw it like an expanding circular wave in a pond, maybe caused by a rock we threw inside it. We all did something like that in our life! Now, to get to our case in point, we have to map this "Event" (I call it "splash" because it is easier to imagine than a flash in the night, even though the principle behing them - the Events - are absolutely the same).
Now, if we map Time vertically, and stack the sequential (and increasing in size) "waves", which pile-up one on top of the other, we get a cone whose Summit looks down. The flat area is "our Present" Time (see the upper portion of the imaged picture). Now, let's go back to the Light. A Light Cone is a flash of light moving through Spacetime. Usually people draw it as two Cones: the bottom one is Light collapsing into a single Event, and the top one is it exploding out again. (watch the imaged picture again and very well)
Did you get it?
But "why all this"? Is it really useful to do that? Well, I do not know. Some people think that, in this way, we can better imagine the World. It shows how the Past can influence the Present and the Future. When the Light Cones overlap, it means that two Objects - or Events ! - interact/ed with each other. Every Event in the Universe has an associated Light Cone, so this is a (kind of) mathematical way to represent the Universe, and the basis for lots of complex Physics (such as curved Spacetime, and why simultaneous Events are relative to the observer.)
The Theory of Relativity replaced the absoluteness of Space and Time with the absoluteness of the Speed of Light. However, all that given, I do believe that this "speculation" is very inspirational, but I also - and very humbly - think that something "BIG" is still missing here.MareKromium
|
|
QUASAR PKS 1127 X-RAY.jpgQuasar PKS 1127 (X-Ray view)115 visite"Oh, the Mind, the Human Mind...The Human Mind has its mountains: its steep and rugged precipices; its frightful crevasses that open, suddenly, over abysses absolutely impenetrable to Man."
(Traduzione)
"...Oh, la Mente, la Mente Umana...La Mente Umana ha le sue montagne: i suoi precipizi impervi e scoscesi; i suoi spaventosi crepacci che si aprono, improvvisamente, sopra abissi assolutamente impenetrabili all'Uomo..."
Gerard Manley Hopkins
|
|
He2-90-HST-PIA04214_modest.jpgHe2-90 - HST115 visite"...Se io fossi capace di vedere, oltre le Notti, ed oltre i Giorni, che fanno la Vita;
Se fossi capace di sentire, le Grida del Passato i Sussurri dell'Avvenire, e le Parole del Presente;
Se ci fosse un Cielo, grande abbastanza per coprirmi;
Se ci fosse un Sole, rosso e caldo ad illuminarmi e
Se ci fosse un Angelo, grande e forte, pronto ad abbracciarmi;
Volerei via con Lui,
Se ci fosse, volerei via con Lui..."
Paolo C. Fienga - "Prière du Matin"
|
|
The_Tarantula_Nebula-R136.jpgInside the Large Magellanic Cloud: the "Tarantula Nebula"115 visite"It matters not to me whether my work is read now, today, or by Posterity, a thousand or more years from now.
I can easily wait a century for my Readers, since God himself has waited for a Watcher for six thousand years.
Mine is a triumph: I have stolen the Golden Secret of the Egyptians, and now, I want to abandon myself to my Sacred Fury."
(Traduzione)
"...Non mi importa che la mia opera venga letta ora, oggi, o dalla Posterità, fra mille e più di mille anni.
Potrò tranquillamente aspettare un secolo i miei Lettori, poiché Dio stesso ha atteso un Osservatore per seimila anni.
Il mio è un trionfo: ho rubato l'Aureo Segreto degli Egiziani ed ora, voglio abbandonarmi al mio Sacro Furore..."
Edgar Allan Poe - "Eureka"
|
|
NGC-6751_-_HST.jpgNGC 6751 - Planetary Nebula in Aquila115 visite"Fortuna opes auferre, non animum potest"
(Seneca)
"Il Destino può portare via le ricchezze tangibili, ma non l'anima"
|
|
NeutronStarsCollision.jpgNeutron Stars' Collision115 visite"...La competizione, reale o fittizia che sia, fra i Grandi Gruppi di Potere e di Controllo (Culti, Partiti Politici, Sistemi Filosofici ed Economici e così via), se la si guarda da una buona distanza e con un distacco sufficiente, si rivela per quello che è: la Grande Scuola del Nulla.
Perché?
Perché ciò che questi Grandi Gruppi pretendono, sia pure in modi diversi, di insegnare (e cioè, per esempio, la Fede, la Speranza e, in fondo, le stesse idee di Libertà e di Vita) è un qualcosa che sfugge - per definizione! - alle capacità meramente logiche della Mente Umana.
In altre parole, un Professore, per bravo e convincente che possa essere, non può insegnare quello che non sa o che non si può apprendere...".
P.C. Floegers - "Conversations"
|
|
NGC-4438-2.jpgNGC 4438 - Active Galaxy with possible Black-Hole115 visite"...Quicumque turpi fraude semel innotuit, etiam si verum dicit, amittit fidem..."
(Fedro)
"Chiunque si fece conoscere (anche per) una volta sola come bugiardo, anche se dice la verità non viene creduto"
|
|
| 1039 immagini su 87 pagina(e) |
|
|
|
|
|
22 | |
|
|
|
|
|
|
