ASTRONOMIJA

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Brzaner
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#76

Post by Brzaner » 31/08/2007 22:31

NIN wrote:
Brzaner wrote:PS. Upitao bih znalce: Nesto kontam, znamo da su galaksije tzv. jata zvijezda, ali postoje li zvijezde izmedju galaksija, dakle, moze li se sresti u praznom prostoru poneka usamljena i ako moze, kako je to moguce?

Tnx :-D
Ne postoje!

Galaksije su skupovi zvijezda okupljenih uzajamnim gravitacionim djelovanjem i kao takve su zasebno kosmicko tijelo koje ima svoj gravitacioni uticaj na okolinu, tj. susjedne galaksije. Postoje jos veca gravitaciona tijela koja nazivamo jata galaksija.

Dakle, ocigledno je da u medjugalaktickom prostoru jednostavno nije moguca geneza zvijezda radi insuficijencije materije.

Pozdrav...
Ma nikad sve naucit' :( http://curious.astro.cornell.edu/questi ... number=384

Pozz :)


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NIN
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#77

Post by NIN » 01/09/2007 06:20

Brzaner wrote:
NIN wrote:
Brzaner wrote:PS. Upitao bih znalce: Nesto kontam, znamo da su galaksije tzv. jata zvijezda, ali postoje li zvijezde izmedju galaksija, dakle, moze li se sresti u praznom prostoru poneka usamljena i ako moze, kako je to moguce?

Tnx :-D
Ne postoje!

Galaksije su skupovi zvijezda okupljenih uzajamnim gravitacionim djelovanjem i kao takve su zasebno kosmicko tijelo koje ima svoj gravitacioni uticaj na okolinu, tj. susjedne galaksije. Postoje jos veca gravitaciona tijela koja nazivamo jata galaksija.

Dakle, ocigledno je da u medjugalaktickom prostoru jednostavno nije moguca geneza zvijezda radi insuficijencije materije.

Pozdrav...
Ma nikad sve naucit' :( http://curious.astro.cornell.edu/questi ... number=384

Pozz :)
Pa dobro, do mene je jer nisam dovoljno protabirio pitanje.

Ali, ostaje fizikalna cinjenica je da se zvijezde jednostavno ne mogu FORMIRATI u prostorima u kojima ne postoji dovoljno materije, prostorima izmedju galaksija, jer je sva materija vec na okupu radi ogromne privlacne gravitacije (postoji i odbojna :) ). Druga je stvar ono sto se govori u tekstu koji si postavio, kada dolazi do kolizije galaksija radi medjusobnog privlacnog gravitacionog djelovanja kada se desava da neke od zvijezda bivaju izbacene (ne generirane) u obliznji medjuprostor nakon cega ce ponovo biti privucene maticnim galaksijama radi njihovog nesavladivog gravitacionog djelovanja.

Pozdrav...

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Arminovski
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#78

Post by Arminovski » 02/09/2007 05:11

NIN wrote: Pa dobro, do mene je jer nisam dovoljno protabirio pitanje.

Ali, ostaje fizikalna cinjenica je da se zvijezde jednostavno ne mogu FORMIRATI u prostorima u kojima ne postoji dovoljno materije, prostorima izmedju galaksija, jer je sva materija vec na okupu radi ogromne privlacne gravitacije
Po pravilu da ali je moguce i da postoje izuzeci... Ja vjerujem da ce se takve zvijezde naci prije ili kasnije ali to je samo moje licno uvjerenje.
Vrijeme ce pokazati. Zasad si u pravu. :)

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NIN
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#79

Post by NIN » 06/09/2007 08:24

Image

NASA-in svemirski teleskop Spitzer je duboko u mladom zvijezdanom sustavu otkrio vodene pare dovoljne za ispunjavanje svih Zemaljskih oceana pet puta. Ta vodena para dolazi od leda u kukuljici oblaka koji okružuje embrioničku zvijezdu nazvanu NGC 1333-IRAS 4B (u samom središtu slike). Materijal iz kukuljice, uključujući i led, pada prema središtu oblaka. Led tada propada prema prašnom protoplanetarnom disku koji okružuje zvijezdani embrij (oblak nalik krafni) i isparava. Na kraju bi ta voda mogla pronaći put prema planetima u nastanku.
net.hr

Pozdrav...

Brzaner
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#80

Post by Brzaner » 06/09/2007 14:20

NIN wrote:Izvan Sunčevog sustava otkriven je prvi planet pogodan za život, koji ima temperaturu nalik Zemljinoj, a znanstvenici to opisuju kao veliki korak u potrazi za životom u svemiru.
A bilo je i vrijeme... od cca 500.000.000.000 (petsto milijardi) "Sunaca" samo u nasoj galaksiji, oko kojih orbitiraju svakojake planete, konacno pronadjena jos jedna "Zemlja" :-D

Prikaz dijela nase galaksije "Milky Way" (skup zvijezda) koja je samo jedna od milijarde slicnih u svemiru...
Image

Pozz :)

walkabout
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#81

Post by walkabout » 13/09/2007 10:49

Evo jedan clanak na temu "umiranja" Sunca.

-------------------------------------

Earth could survive dying sun

Chee Chee Leung
September 13, 2007 - 12:28PM



Astronomers have discovered the first planet that has survived the massive expansion of its parent star - opening up the possibility Earth could do the same.

Stars become red giants during the later stages of their evolution, burning up their hydrogen cores and swallowing up nearby planets as they expand.

When our Sun enters its red-giant phase in about 5 billion years, it is expected to engulf the solar system's inner planets, including Mercury, Venus and even Earth.

But a team of researchers from Europe, the US and Asia has reported the discovery of a large planet, about three times the size of Jupiter, that has survived the red-giant phase of its parent star.

The planet orbits the star at a distance less than twice the distance between the Earth and Sun. Researchers said their findings suggest planets with similar orbital distances may also survive a red-giant star.

The star, known as V 391 Pegasi, in its earlier years had a mass estimated to be similar to the Sun.

Before it turned into a red giant, the distance between the star and the planet, called V 391 Peg b, was thought to be about the same as that between the Sun and Earth.

Simon O'Toole, a research fellow at the Anglo-Australian Observatory, said the findings were "very exciting". "Our Sun will become a red giant, it will become really bloated and big as it ages, and it's important to know that planets that orbit it could survive."

But Dr O'Toole said even if Earth did survive, the heat from the Sun in its red-giant form was likely to burn away the atmosphere and make life impossible. "The planet might survive as a rock, but we're most likely going to get fried."

V 391 Pegasi, which is in the northern constellation of Pegasus, evolved into a rare type of star known as a B subdwarf. These stars experience a significant loss of mass when strong winds blow away their outer layers of hydrogen. The findings are published in the journal Nature.

walkabout
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#82

Post by walkabout » 17/09/2007 21:03

Izgleda da smo jos manji nego sto sam mislio da jesmo - kako li je tek virusima... :roll:

-----------------------------

Far, far away and - bingo - another 14 galaxies

Chee Chee Leung
September 18, 2007

AN AUSTRALIAN astronomer is part of an international team that has discovered 14 galaxies halfway across the universe, opening up a new era of galaxy hunting.

The galaxies, which are about 7 billion light years from Earth, have been difficult to detect, because they lie in front of bright, distant objects known as quasars.

The glare of the quasars hides the dim light from the galaxies, but a powerful infrared instrument in Chile helped the scientists uncover the galaxies.

"It effectively allows us to see through the glare of the quasar," said the researcher Dr Michael Murphy, of Swinburne University. "By chopping up the light into many finely dissected colours, we can essentially get rid of the quasar altogether, and see the galaxy coming through."

The research team, headed by Germany's Max Planck Institute for Extraterrestrial Physics, began its search by using quasars as "cosmic beacons" to reveal the presence of a galaxy.

Dr Murphy trawled through huge catalogues of quasars to find those with "dips" in their colour spectrum. This shows a galaxy is in front of the quasar, absorbing some of its light before it reaches the Earth. By studying the patches of sky around 20 of these quasars - using the European Southern Observatory's Very Large Telescope - the researchers detected the 14 galaxies, a success rate of 70 per cent.

There are estimated to be hundreds of billions of galaxies, but only about a dozen that sit in front of quasars have been detected at such a distance from Earth.

Light from these newly found galaxies comes from the time the universe was about 6 billion years old, less than half its current age. By studying the light, the researchers have determined they are "starburst galaxies" that are forming lots of new stars - the equivalent of 20 suns a year.

Dr Murphy, who began working on the project while a research fellow at the University of Cambridge, described the results as a "great leap forward" in the study of distant galaxies. The findings have been accepted for publication in The Astrophysical Journal.

zmijaIzmaj
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#83

Post by zmijaIzmaj » 17/09/2007 21:15

jel zna neko gdje je u BiH najveci teleskop, gdje ima opservatorij?

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Fiore
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#84 we

Post by Fiore » 19/09/2007 15:46

Bio na Trebevicu (Sarajevo) jedan od tri najjaca na balkanu 80-tih..kako sam cuo..u ratu unisten.i opljackan..pstoje neke ideje da se obnovi ali.,kod nas se ne rjesavaju vaznija pitanja godinama kamoli ovo.. Ovi nasi prate to preko interneta.,a najblizi je negdje u Madjarskoj kao.. et tako sam cuo..

Vezano za atronomiju.,sad znam da nista ne znam..puno je toga zaista.. a sa nasim sredstvima osudjeni smo na propast.. :x

Geopard
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#85

Post by Geopard » 05/10/2007 13:47

Možda se vi pokušate organizovati sami.
Čekajući na državu pono ćete više izgubiti nego dobiti.
Lagano teleskop u ruke, i na Trebević.

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NIN
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#86

Post by NIN » 09/10/2007 12:42

Rađa se Zemljina rođakinja

Image
NASA-in svemirski teleskop Spitzer otkrio je binarni zvjezdani sustav, u kojem astronomi očekuju razvitak stjenovitih planeta nalik Zemlji oko barem jedne od dviju zvijezda.

Ugniježđena u središtu pojasa vruće guste prašine, Zemljina daleka rođakinja možda se rađa na udaljenosti od 424 svjetlosne godine od našeg planeta, u sustavu nazvanom HD 113766. "Taj zvjezdani sustav star je od 10 do 16 milijuna godina i još je u 'ranoj mladosti', što je pravo vrijeme za nastanak planeta sličnog Zemlji", misli Carey Lisse, istraživač u Laboratoriju primijenjene fizike Sveučilišta John Hopkins. Svijetle točke na slici predstavljaju dvije zvijezde, a smeđi prsten materijala koji kruži oko središnje zvijezde predstavlja ogromni pojas prašine, koji je 100 puta veći od našeg pojasa asteroida, a koji je dovoljan za tvorbu planeta veličine Marsa ili čak i većeg.

Stjenoviti materijal u pojasu predstavlja rane faze u formiranju planeta, kada se čestice prašine sljubljuju kako bi stvorile stijene, koje se sudaraju i tvore veća stjenovita tijela zvana planetecimali. Prsten čine kameniti amalgami nalik onima iz Zemljine kore i metalni sulfidi poput onih u središtu Zemlje. Pojas je smješten u sredini nastanjive zone sustava, ili u području oko zvijezde u kojem bi mogla postojati voda u tekućem obliku, samim tim i Život, na bilo kojem stjenovitom planetu koji bi mogao nastati u kasnijem razvoju sustava. Zemlja je smještena u sredini nastanjive zone Sunčevog sustava.

Vanjski bijeli prsten predstavlja koncentraciju ledene prašine, kakve također ima u našem sustavu. Taj se materijal nalazi na poziciji na kojoj se u Sunčevom sustavu nalazi asteroidni pojas, ali u odnosu na unutrašnji prsten sadrži tek oko jedne šestine materijala. Astronomi kažu da iz Spitzerovih promatranja nije jasno događa li se što u tom ledenom prstenu, ali vjeruju da bi kasnije mogao postati izvor vode za planete koji će nastati iz unutrašnjeg vrelog prstena. "Trebat će vjerojatno još sto milijuna godina da bi se završilo stvaranje tog planeta, a zacijelo još milijarda da se jave prvi znaci života, poput alga", protumačio je Lisse. Lisseovi radovi trebaju idućeg tjedna biti predstavljeni u Američkom astronomskom institutu, a bit će objavljeni u idućem broju Astrophysical Journala.

Net.hr

Pozdrav...

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Arminovski
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#87

Post by Arminovski » 04/12/2007 11:09

Nije sad bas astronomija ali fizika je pa je mozda blizu.
Nova i nevjerovatno jednostavna teorija svega (nije bas ni da je jednostavna ali u poredjenju sa drugima). Stvarno interesantna i cudno je vidjeti kako se neke stvari poklapaju u matematici i u prirodi. Bice interesantno vidjeti kakve ce rezultate LHC pokazati.

http://www.telegraph.co.uk/earth/main.j ... urf114.xml
http://www.telegraph.co.uk/connected/ma ... tern19.xml

http://en.wikipedia.org/wiki/An_Excepti ... Everything

Za fantome:
http://arxiv.org/PS_cache/arxiv/pdf/071 ... 0770v1.pdf

walkabout
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#88

Post by walkabout » 15/01/2008 07:51

Odavno nista nije bilo ovdje...

----------------------------

January 15, 2008 - 9:50AM

A car-sized NASA probe zoomed about 200 kilometres above the rocky, crater-scarred surface of Mercury on Monday, becoming the first spacecraft since 1975 to fly past the closest planet to the sun.

The US space agency's Messenger probe travelled about 25,700 kmh as it passed over Mercury on a mission designed to resolve some of the mysteries about the solar system's innermost planet, officials said.

"So far, things look pretty good. The spacecraft was on the course we wanted it to be on," Michael Paul, a mission engineer, said.

It flew roughly along the equator and at a slightly higher altitude than originally planned, but the change had no negative effects, Paul said. He said the probe was briefly out of contact as it passed behind Mercury but communications were quickly re-established.

Messenger is scheduled to pass Mercury again in October and in September next year, using the pull of the planet's gravity to guide it into position to begin a planned yearlong orbit of the planet in March 2011.

Mark Robinson of Arizona State University, a member of the mission's science team, said the closest approach was on the planet's "night side" - the one facing away from the sun.

The probe is due to begin transmitting data it collected during the fly-by back to Earth tomorrow, Paul said.

NASA said it hopes to have the first scientific results available for the public later this month.

The probe's equipment is gathering data on the mineral and chemical composition of Mercury's surface, its magnetic field, its surface topography and its interactions with the solar wind, say scientists working on the project.

By the time the mission is completed, scientists also hope to get answers on why Mercury is so dense, its geological history, the structure of its iron-rich core and other issues.

The only previous times Mercury was visited by a spacecraft were in 1974 and 1975 when NASA's Mariner 10 flew past it three times and mapped about 45 per cent of its surface.

With Pluto now considered a dwarf planet, Mercury is the solar system's smallest planet, with a diameter of 4880 kilometres, about a third that of Earth.

Reuters

Almir Arnaut-Belli
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#89

Post by Almir Arnaut-Belli » 18/01/2008 01:46

pozdrav NiN-u i ti si jedan ali vrijedan čojk na sajtu,ti si naš svemir i naša enciklopedija,da bogdom ljudi svi skontaju šta im objašnjavaš bilo bi ti da si naš izvor informacija,ali u svakom slučaju sa tobom više svemir nije tajna,zavidim ti na tom znanju i imanju i volio bi da nam nastaviš tako još makar sto godina

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pojedinac
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#90 Mala planeta će za dlaku promašiti Zemlju

Post by pojedinac » 24/01/2008 10:51

Mala planeta će za dlaku promašiti Zemlju

24 januar 2008, 09:25

RIJSWIJK (ANP) - Mala planeta, sa imenom 2007TU24, proletjet će u utorak 29-tog januara veoma blizu Zemlje. Proći će na rastojanju od otprilike 500.000 kilometara. U kosmičkim terminima to znači da će ona za dlaku promašiti Zemlju.
To je astronom Theo Jurriëns sa državnog univerziteta Groningen (RuG) u četvrtak potvrdio nakon objavljivanja vijesti u AD. ,,To je inače dva puta rastojanje od Zemlje do Mjeseca'', relativira on istovremeno. ,,Stoga mi nećemo ništa od toga primjetiti.''

http://www.ad.nl/binnenland/article1993449.ece

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wels
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#91

Post by wels » 26/01/2008 01:34


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Sensei
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#92

Post by Sensei » 21/02/2008 16:49

...
Last edited by Sensei on 25/05/2019 19:09, edited 1 time in total.

pesak
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#93

Post by pesak » 29/02/2008 20:44

[img]http://www.nasa.gov/images/content/2103 ... ]_full.jpg[/img]

Mysterious Galaxy
This image of the elliptical galaxy NGC 1132 and its surrounding region combines data from NASA's Chandra X-ray Observatory and the Hubble Space Telescope. The blue/purple in the image is the x-ray glow from hot, diffuse gas detected by Chandra. Hubble's data reveal a giant foreground elliptical galaxy, plus numerous dwarf galaxies in its neighborhood, and many much more distant galaxies in the background.

walkabout
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#94

Post by walkabout » 11/03/2008 18:56

A DECADE after leaving home to explore the final frontier, a mechanical pioneer has been ordered to take a cold shower.

Early tomorrow, Sydney time, a space probe will dive into the plume of the biggest geysers ever discovered.

Blasting out of mysterious cracks in the surface of Enceladus, a moon of the ringed planet Saturn, the geysers spew what appears to be pure water ice and dust more than 500 kilometres into space.
Launched in 1997, NASA's $3.5 billion Cassini probe has been circling Saturn since 2004, snapping pictures of the planet, its famous rings and its scores of moons. Just 500 kilometres wide, Enceladus has long puzzled scientists because it is one of the shiniest objects in the solar system. Its surface reflects sunlight like freshly fallen snow.

When Cassini swept past the moon in 2005 it recorded a world that appeared to be covered in water ice. But what really startled scientists were the streams of ice and dust shooting out from the strange parallel cracks they nicknamed "tiger stripes".

The ice is thought to be gushing from water, and possibly even oceans, hidden beneath the frozen crust of Enceladus.

"Obviously, there's a source of water down there," said a Cassini scientist, Dr Marcia Burton. "It's coming out everywhere. How big it is, how extensive, people don't know for sure."

Astonished by what could be seen, NASA decided to take a closer look at the geysers, sending Cassini directly through the towering plumes.

Tomorrow morning the probe will zoom within 52 kilometres of the icy world. Thirty seconds later, travelling at more than 14 kilometres a second, Cassini will enter the plume of the geysers, 200 kilometres up. Instruments will attempt to analyse the microscopic geyser particles.

"Cassini will taste the waters of Enceladus for its quality and composition," said Glen Nagle, a spokesman for NASA's deep space tracking station at Tidbinbilla, outside Canberra. "If there's water there is always a possibility of life."

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#95 Re: ASTRONOMIJA

Post by mustang_gt_1987 » 17/03/2008 01:05

Saturnov mjesec Tethys je u prošlosti imao tečni okean

Jedan od Saturnovih mjeseca je najvjerovatnije u svojoj prošlosti imao tečni okean ispod svoje ledene površine, objavili su naučnici na konferenciji u Hustonu u Texasu.

Radi se o mjesecu Tethys koji je prekriven ledom.

Naučnici vjeruju da je val toplote nakon kojeg je uslijedila hladnoća koja je zamrzla Tethysove okeane, možda formirala gigantski Ithaca Chasma otvor.

Proračuni naučnika sa Univerziteta u Californiji pokazuju da je gravitaciono polje između Tethysa i Saturna bilo ometano gravitacionim poljem drugog saturnovog mjeseca Dione.

Naučnici vjeruju da je takva pojava uzrokovala povećano zagrijavanje Tethysa koje je prestalo nakon što su orbitalne veze između dva mjeseca vremenom prekinute nakon čega se Tethys počeo hladiti.

Usljed zamrzavanja nastale su velike pukotine u ledu kao što je Ithaca Chasma.

Jedan od naučnika koji su radili na istraživanju objavio je da se ne može sa sigurnošću utvrditi koje je dubine bio okean ali se vjeruje da je dubina okeana na nekim tačkama na Tethysu iznosila oko 100 km.

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Arminovski
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#96 Re: ASTRONOMIJA

Post by Arminovski » 08/04/2008 00:17

hvala sensei...

par filmova na koje sam slucajno naisao na google video... jedan fini cikica profesor prica neprestano oko tri sata (sat po filmu otprilike) i objasnjava. Nisu novosti ali simpa gledati. Neki ce se mozda nauciti nesto, drugi ponoviti gradivo, treci jah... nasmijati se njegovoj bradi. :-D Vjerujem da ce svako naci nesto

Ugodno gledanje!
Lekcija iz astronomije 1
Lekcija iz astronomije 2
Lekcija iz astronomije 3

multivitamin
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#97 Re: ASTRONOMIJA

Post by multivitamin » 11/04/2008 18:11

12 Aprila 1961 godine, Ruski kosmonaut Juri Gagarin je postao prvi covjek koji je poletio u svemir, oznacavajuci pocetak nove ere astronomskih istrazivanja ....

12 Aprila 2008, ljubitelji astronomije i dobre muzike, iz 49 zemalja, na 7 kontinenata organizuju 173 svemirske zabave obiljezavajuci ovaj monumentalni dogadjaj....

12. aprila 2008, i Sarajevo se upisuje na listu gradova svijeta sa Svemirskom zabavom:

Uz muziku, video projekcije, i dva velika teleskopa za promatranje nocnoga neba i Vi mozete postati dijelom globalne zabave koja se sirom planete desava isti dan:
od Antartika, preko Afrike, Amerike, Australije i Azije sve do kluba Fis-Bok u nasem gradu.

Od 21. sat pa do prvih suncevih zraka, kroz dva teleskopa uzivajte u nebu i zvijezdama kakve jos niste vidjeli. Sve to uz svemirsku muziku Re:Publike obecava kozmicku noc za sjecanje ove subote u klubu Fis-Bok.

PS: Vedro nebo required

Vise informacija na: http://www.yurisnight.net/2008/

walkabout
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#98 Re: ASTRONOMIJA

Post by walkabout » 20/04/2008 00:37

Kemica glede naucnije letova naMjesec - odlomak izclanka Nashinal Dziografik:

"...brez dugorocnije zivotnije ciljeva nejma nam zivota tojes funding...a i saotim metkom se raji zeljnoj mastovitije prica malo i mozak zabavijo i smirijo (Mensura namje zivi dokaz )... :oops: :D "

---------------------------------

NASA wants astronauts who return :lol: to the moon to take one long step for mankind by staying there for up to six months.

The US space agency announced it hoped to build moon bases with an intricate transportation and power system that can house astronauts for long stays.

NASA is examining different designs for lunar outposts that could be inspired by the orbiting International Space Station (ISS), NASA's Director of Advanced Capabilities Division, Carl Walz said yesterday.

"We need to establish a long, extended presence on the moon, up to six months - same as the time we spend at ISS," Mr Walz said at a forum on NASA's future, at the University of Miami.

The ISS usually accommodates three scientists, although it can house more when astronauts arrive on board NASA's space shuttle on scientific missions.

The station contains a complex set of laboratories from the US, Russia, Europe and Japan that allow scientists to study the effects of very low gravity on humans and plants.

US space officials plan to return :lol: to the moon by 2020.

"We will live at the moon, work at the moon and use its resources," Mr Walz said.

Diplinger
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#99 Re: ASTRONOMIJA

Post by Diplinger » 21/04/2008 19:22

http://www.sarajevo-x.com/clanak/080421105

zna li neko o ovom drustvu kako se haplicirati i sl...

jefferson
Posts: 14985
Joined: 28/08/2007 05:31
Location: U.S.A

#100 Re: ASTRONOMIJA

Post by jefferson » 21/04/2008 19:36

Ovo me pravo obradovalo!
Konacno lijepa vijest, samo se nadam da se zvijezde i galaksije nece poceti djeliti na "nase" i "njihove"

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