Author Topic: Pitanja u vezi sa astronomijom/astrofizikom  (Read 37342 times)

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lilit

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #250 on: 13-04-2019, 21:12:12 »
agli ima moju podršku!  xrofl
Some things you have to do yourself.

Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #251 on: 28-04-2019, 06:41:03 »
New Hubble measurements confirm universe is expanding faster than expected
 
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New measurements from NASA's Hubble Space Telescope confirm that the Universe is expanding about 9% faster than expected based on its trajectory seen shortly after the big bang, astronomers say. 

Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #252 on: 30-06-2019, 06:15:39 »
Researchers decipher the history of supermassive black holes in the early universe
 
 
Konkretnije, ovaj rad pokazuje mehanizam po kome supermasivne crne rupe(možda) nisu nastale od zvezda jer su se formirale tako brzo da su "odmah" kolabirale u, jelte singularitet.





Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #257 on: 12-08-2019, 08:08:31 »
Pokušavam da dozovem Aglija ovakvim vestima:


Dark matter may be older than the Big Bang

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"The study revealed a new connection between particle physics and astronomy. If dark matter consists of new particles that were born before the Big Bang, they affect the way galaxies are distributed in the sky in a unique way. This connection may be used to reveal their identity and make conclusions about the times before the Big Bang too," says Tommi Tenkanen, a postdoctoral fellow in Physics and Astronomy at the Johns Hopkins University and the study's author.

Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #258 on: 07-09-2019, 05:08:59 »
Brzina ekspanzije svemira nikako da poprimi neku logičnu vrednost.
 
 
 One Number Shows Something Is Fundamentally Wrong with Our Conception of the Universe

Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #259 on: 18-09-2019, 07:40:48 »
Astronomers Detect the Most Massive Neutron Star Yet

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The newly measured neutron star, called J0740+6620, lies about 4,600 light-years from Earth. It packs 2.14 times the mass of the sun into a sphere only about 15 miles (25 km) in diameter. That approaches the theoretical limits of how massive and compact a single object can become without crushing itself down under the force of its own gravitational pull into a black hole.


Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #261 on: 02-10-2019, 05:45:34 »
Ovo je sve za sada prilična spekulacija, rad na kome se članak zasniva nije još ni publikovan, ali je zanimljivo:
 
 If Planet 9 Is Actually a Black Hole, It Completely Changes How We Understand Our Universe

Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #262 on: 04-10-2019, 04:52:01 »
    Scientists start mapping the hidden web that scaffolds the universe
 

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After counting all the normal, luminous matter in the obvious places of the universe – galaxies, clusters of galaxies and the intergalactic medium – about half of it is still missing. So not only is 85% of the matter in the universe made up of an unknown, invisible substance dubbed “dark matter”, we can’t even find all the small amount of normal matter that should be there.
This is known as the “missing baryons” problem. Baryons are particles that emit or absorb light, like protons, neutrons or electrons, which make up the matter we see around us. The baryons unaccounted for are thought to be hidden in filamentary structures permeating the entire universe, also known as “the cosmic web”.
         
 
Evo studije na kojoj je članak baziran  ako neko želi da se napoji direkt sa izvora (i ako plaća pretplatu..):

 
Gas filaments of the cosmic web located around active galaxies in a protocluster   

Izitpajn

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #263 on: 07-10-2019, 11:55:58 »
[/b]Evo studije na kojoj je članak baziran  ako neko želi da se napoji direkt sa izvora (i ako plaća pretplatu..):

 
Gas filaments of the cosmic web located around active galaxies in a protocluster   

ArXiv je majka svih arhiva ;)

https://arxiv.org/abs/1910.01324

Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #264 on: 19-10-2019, 05:56:59 »
Evo, kome se čita studija koja tvrdi da je verovatnoća da u univerzumu ima još inteligentnog života zapravo mnogo manja nego što smo do sada mislili:
 
 
Dissolving the Fermi Paradox
 
 
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 Abstract

The Fermi paradox is the conflict between an expectation of a high ex ante probability of intelligent life elsewhere in the universe and the
apparently lifeless universe we in fact observe. The expectation that the universe should be teeming with intelligent life is linked to models like the Drake equation, which suggest that even if the probability of intelligent life developing at a given site is small, the sheer multitude
of possible sites should nonetheless yield a large number of potentially observable civilizations. We show that this conflict arises from the use of Drake-like equations, which implicitly assume certainty regarding highly uncertain parameters. We examine these parameters, incorporating models of chemical and genetic transitions on paths to the origin of life, and show that extant scientific knowledge orresponds to uncertainties that span multiple orders of magnitude. This makes a stark difference. When the model is recat to represent realistic distributions of uncertainty, we find a substantial ex ante probability of there being no other intelligent life in ou observable universe, and thus that there should be little surprise whenwe fail to detect any signs of it. This result dissolves the Fermi paradox,
and in doing so removes any need to invoke speculative mechanisms by which civilizations would inevitably fail to have observable effects upon the universe.

 
Slično:
 
    Evolution tells us we might be the only intelligent life in the universe    






Accuphase

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #270 on: 09-11-2019, 12:18:52 »
Voyager 1 je dosta brži od sonde blizanca Voyager 2 stoga je i ranije prošao kroz heliopauzu i tako ušao u međuzvezdani prostor.

https://voyager.jpl.nasa.gov/mission/status/

https://www.skyandtelescope.com/astronomy-news/interstellar-space-the-view-voyager-2/


Accuphase

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #271 on: 10-11-2019, 21:52:33 »
Treba imati na umu da sonde Voyager ne idu jedna za drugom, zapravo sada se kreću jedna južno a drugo severno od ravni ekliptike odnosno ravni revolucije Zemlje oko Sunca.
Moguće je uzimajući u obzir nagib ekliptike u odnosu na ravan Galaksije i u odnosu na pravac kretanja Sunca oko centra same Galaksije do to ima uticaja na očitavanja instrumenata na sondama.
Drugim rečima heliosfera najverovatnije ni nema sferičan oblik već drugačije oblikovan samim kretanjem Sunca.



Accuphase

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #273 on: 11-11-2019, 16:22:55 »
Poštovani Meho nije li poželjno ponekad napisati i poneki komentar sem postavljanja linkova na po pravilu strane sajtove?
Svaka vama čast što vas toliko toga očito interesuje ali ovo bi zaista trebalo da ispoštujete.

Accuphase

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Boban

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #276 on: 11-11-2019, 17:00:46 »
kad sam ja bio mlad, verovalo se da je Sunčev sistem prečnika 300 milijardi kilometara, a sada vidim da se pominje 10x manja vrednost. Realno, Sunčev sistem je doklegod gravitacija Sunca nešto drži i privlači, a ne samo doseg magnetnog polja.
Put ćemo naći ili ćemo ga napraviti.

Accuphase

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #277 on: 11-11-2019, 17:52:25 »
Inače ovom metodom tranzita ili okultacije se otkrivaju vansolarne planete oko drugih zvezda.
Golom oku nevidljivo ali osetljivim instrumentima merljivo smanjenje sjaja zvezde izazvano praktično "pomračenjem" daleke planete oko matične zvezde je dokaz da ista postoji.

Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #278 on: 18-11-2019, 08:49:09 »
There’s Growing Evidence That the Universe Is Connected by Giant Structures

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Scientists are finding that galaxies can move with each other across huge distances, and against the predictions of basic cosmological models. The reason why could change everything we think we know about the universe.



Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #281 on: 06-12-2019, 06:49:18 »
An experiment that solved a 100-year-old mystery posed by Einstein just got up to 50% more powerful by squeezing light
 
 
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One of the most remarkable experiments in history — a trio of giant machines that listen for ripples in spacetime called gravitational waves — just got more powerful and precise.

Meho Krljic

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Re: Pitanja u vezi sa astronomijom/astrofizikom
« Reply #282 on: 07-12-2019, 06:36:54 »
Will We Ever Find Dark Matter in the Universe? 
 
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One newly popular idea is that the dark matter might not be alone, but instead could be one of several kinds of particles that constitute what is known as a “hidden sector.” The particles that make up such a hidden sector could interact among each other, but almost never with any of the known forms of matter, explaining why they have been so difficult to detect in underground experiments or to produce at the Large Hadron Collider. The particles that make up a hidden sector could have evolved and interacted in the early universe in any number of potentially complex ways, even experiencing forces that we have never witnessed. Particle physicists have proposed many theories in which the interactions between multiple kinds of hidden matter can lead to the viable production of dark matter in the early universe. In fact, it’s been quite easy for particle physicists to come up with viable hidden sector theories that behave in this way.