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Scale of the Universe

gordan84

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peja81

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Dobar video!
:wave:
 
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Villy

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~~~~~~~~~~~~~~~~~
Ono sa linka sam vec video ali super je, i prema "dole" i prema "gore" maltene nema granica. A video je ekstra ;)
 

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Meni je uvek bilo fascinantno kako veoma male (atom) i ogromne stvari (solarni sistem) u stvari liče.
 

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Sjajan video. Sva sreća pa smo mi jedina nastanjena planeta :)
 

cula

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Super linkovi.

U cilju spajanja tema i diskusiji o svemiru.

Jeste li znali za ovo, meni deluje ubedljivije nego teorija o pangei.

 
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Villy

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Čuo sam za ovo, ali ima dosta "pukotina" u toj teoriji. Npr da se Zemlja širi, onda bi se svi kontinenti odaljivali jedan od drugo, a ne nasumice spajali i razdvajali.
 

blackmore1911

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Sjajan video. Sva sreća pa smo mi jedina nastanjena planeta :)
Ne mora da znaci :) To sto mi nismo otkrili ni sopstvenu planetu (okeani su manje istrazeni nego povrsina Meseca) , ne znaci da smo jedini u svemiru :)
 

peja81

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Samo u našoj galaksiji ima 100-200 milijardi zvezda. Neka svaka 1000-ta ima planetu sličnu Zemlji, to je 100-200 miliona takvih planeta. Ma i neka bude svaka milionita, opet se radi o 100-200.000 takvih planeta. Tek smo počeli da tražimo egzoplanete, Kepler Misija je u toku, kasnije će doći još moćniji teleskopi koji će omogućiti direktno posmatranje tako udaljenih planeta... Biće zanimljivo narednih ~10-20 godina.:)

Dve lepe slike:


 

peja81

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Kepler napreduje ...

The discoveries are part of several hundred new planet candidates identified in new Kepler mission science data, released on Tuesday, Feb. 1. The findings increase the number of planet candidates identified by Kepler to-date to 1,235. Of these, 68 are approximately Earth-size; 288 are super-Earth-size; 662 are Neptune-size; 165 are the size of Jupiter and 19 are larger than Jupiter. Of the 54 new planet candidates found in the habitable zone, five are near Earth-sized. The remaining 49 habitable zone candidates range from super-Earth size -- up to twice the size of Earth -- to larger than Jupiter.
http://kepler.nasa.gov/news/nasakeplernews/index.cfm?FuseAction=ShowNews&NewsID=98
 

Villy

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Za par dana 54 planete u nastanjivoj zoni? :wtf::eek::eek::nuts: Šta će tek biti do kraja godine?! :kokice:
 

peja81

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Nije baš par dana:

The findings are based on the results of observations conducted May 12 to Sept. 17, 2009, of more than 156,000 stars in Kepler's field of view, which covers approximately 1/400 of the sky.
Ali nebitno, ovo pokazuje da su planete slične Zemlji u tzv. "zlatnoj zoni" mnogo češće nego što se ranije mislilo (računajući i "Super Zemlje" koje su do 2x veće od naše planete).:)

Broj takvih planeta bi mogao da bude i znatno veći, jer je Kepler sve te oblasti posmatrao jedno vrlo kratko vreme, tako da možda mnogo planeta nije ni prošlo između Keplera i njihovih zvezda, pa nisu ni detektovane.
 
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voodoons

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Na planeti duplo vecoj od Zemlje i "ljudi" bi trebali biti duplo veci od nas :rotf:
Bolje da traze planete manje od Zemlje, mozda nam se ne svidi, nadjemo li "ljude" na vecoj planeti :d
 

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Uvek možemo da ih nuknemo, jesi bre gle'o Avatar?! :d
 

Alk0

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Bas kontra, na vecoj planeti sa vecom gravitacijom, "ljudi" bi trebali biti manji :)
Sto se opet lepo slaze sa onom teorijom o rastu Zemlje. Dzinovski dinosaurusi su ziveli kada je Zemlja bila manja i samim tim manje gravitacije. Sada tako velikih zivuljki nema :)
 

peja81

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Logika za prvu rečenicu ti je na mestu, ali za treću nije nikako.;)
Zemlja je mnooogo pre pojave dinosaurusa dostigla svoju konačnu veličinu.
 

Alk0

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Eh, verovatno sam se zeznuo sa vremenskom skalom :D
Ali ucini mi se da je onaj iz klipa pricao kako su dinosaurusi setali svuda po zemlji dok se jos nije "rasirila" pa me to ponelo :)
U svakom slucaju razumeli smo se sta sam hteo reci za potencionalno nastanjive planete :)

EDIT:
Pa i jeste rekao, sad sam ponovo preslusao. I za dinosauruse i za platipussy-je :D
Nisam nikakav strucnjak u ovoj oblasti, pa ne bih da ulazim u raspravu, samo sam izvodio neke laicke zakljucke.
Nisam ja kriv sto su podaci kontradiktorni :)
 
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Villy

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Evo ako nekog interesuje "holografski princip", tj teorija koja je sve popularnija u poslednje vreme, po kojoj ceo Univerzumu ustvari dvodimenzionalan. Ukratko, unutar svake crne rupe se nalazi univerzum. Pošto je tkz Informacioni paradoh bio problem prilikom nestajanje crnih rupa (pošto se informacija ne može uništiti, npr boja, oblik, dimenzije predmeta koji upada u crnu rupu, a upravo dolazi do gubljenja tih informacija kad crna rupa nestane), neko se setio da se zapravo informacija ne gubi, već ostaje "zapisana" na horzintu događaja crne rupe. Malo je zamršeno, ali ne umem bolje da objasnim. Kada crna rupa nestane, ona preko zarčenja koje emituje, zapravo odaje te informacije i one zapravo nisu izgubljenje.
E sad, dolazimo do toga da ako se ceo Univerzum nalazi unutar crne rupe, sve njegove osobine (pa i osobine nas samih, kao i naša razmišljanja) se nalaze zapisane na "našem" horizontu događaja, tj na dvodimenzionalnom horizontu događaja našeg univerzuma. Da stvar bude još interesantnija, ova dvodimenzionalna obloga po mnogo čemu podseća na membrane iz M teorije. Takođe, M teorija nije kontradiktorna sa holografskim principom prenosa kvantnih informacija, čak šta više se dopunjuju :eek: Na kraju ispade da smo svi u stvari u 2Du, a kupujemo 3D grafike :P No way :P :d šalu na stranu, ukoliko pratite stranicu wikipedije o HPu ( a ja redovno pratim http://en.wikipedia.org/wiki/Holographic_principle ), pod podnaslovom "Claimed experimental test at gravitational wave detectors", možete videti rezultate eksperimenta koji treba da detektuje kvante informacije koje dolaze sa našeg HDa, a treba da se završi za nekih mesec-dva :)

Nadam se da nisam bio naporan :) Filmići su zanimljivi :)




Neće "EDIT".. Zanimljiv tekst, ali filmići su bolji ;)

http://www.nonequilibrium.net/175-holographic-principle-dummies/
 
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peja81

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New Estimate for Alien Earths: 2 Billion in Our Galaxy Alone

Roughly one out of every 37 to one out of every 70 sunlike stars in the sky might harbor an alien Earth, a new study reveals.

These findings hint that billions of Earthlike planets might exist in our galaxy, researchers added.

These new calculations are based in data from the Kepler space telescope, which in February wowed the globe by revealing more than 1,200 possible alien worlds, including 68 potentially Earth-size planets. The spacecraft does so by looking for the dimming that occurs when a world transits or moves in front of a star.

Scientists at NASA's Jet Propulsion Laboratory in Pasadena, Calif., focused on roughly Earth-size planets within the habitable zones of their stars — that is, orbits where liquid water can exist on the surfaces of those worlds. [The Strangest Alien Planets]

After the researchers analyzed the four months of data in this initial batch of readings from Kepler, they determined that 1.4 to 2.7 percent of all sunlike stars are expected to have Earthlike planets — ones that are between 0.8 and two times Earth's diameter and within the habitable zones of their stars.

"This means there are a lot of Earth analogs out there — two billion in the Milky Way galaxy," researcher Joseph Catanzarite, an astronomer at NASA's Jet Propulsion Laboratory, told SPACE.com. "With that large a number, there's a good chance life and maybe even intelligent life might exist on some of those planets. And that's just our galaxy alone — there are 50 billion other galaxies."

After three to four years of Kepler data are investigated, the scientists predict a total of 12 Earthlike worlds will be found. Four of these have already been seen in the four months of data released so far, they added. Kepler mission scientists have estimated that, altogether, there could be 50 billion planets in the Milky Way, though not all would be Earth-size worlds within the habitable zone of their local stars. [NASA's Kepler Telescope By-The-Numbers]

When it comes to the 100 nearest sunlike stars within a few dozen light years, these findings suggest that only about two might have Earthlike worlds. Still, Catanzarite did note that red dwarfs might host Earthlike planets as well, and that such stars are far more common than sunlike stars.

Although researchers will find it much harder to detect an Earth-size planet transiting in front of dim red dwarfs, scientists are currently trying to detect such planets around these stars by the gravitational tugs they would exert on each other.

"I'd expect to hear one day about habitable Earth analogs around these stars," Catanzarite said.

Catanzarite and his colleague Michael Shao detailed their findings online March 8 in a paper submitted to the Astrophysical Journal.
http://www.space.com/11188-alien-earths-planets-sun-stars.html
 

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Odgovor na prvi post.

I ne, ne nalazi se univerzum unutar crne rupe :)
 

Diabolique

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Vrh