Astronomija - opšta tema

[bigvlada]

Universe has two trillion more galaxies than previously thought

 

Hubble telescope images from deep space were collected over 20 years to solve the puzzle of how many galaxies the cosmos harbors

 

Thursday 13 October 2016 19.55 BST Last modified on Thursday 13 October 2016 20.59 BST

 

There are a dizzying two trillion galaxies in the universe, up to 20 times more than previously thought, astronomers reported on Thursday. The surprising finding, based on 3D modeling of images collected over 20 years by the Hubble Space Telescope, was published in the Astronomical Journal.

 

Scientists have puzzled over how many galaxies the cosmos harbors at least since US astronomer Edwin Hubble showed in 1924 that Andromeda, a neighboring galaxy, was not part of our own Milky Way. But even in the era of modern astronomy, getting an accurate tally has proven difficult.

 

To begin with, there is only part of the cosmos where light given off by distant objects has had time to reach Earth. The rest is effectively beyond our reach. And even within this “observable universe”, current technology only allows us to glimpse 10% of what is out there, according to the new findings.

 

“It boggles the mind that over 90% of the galaxies in the universe have yet to be studied,” commented Christopher Conselice of the University of Nottingham, who led the study. “Who knows what interesting properties we will find when we observe these galaxies with the next generation of telescopes?” he said in a statement.

 

Using deep space images from Hubble, Conselice and his team painstakingly converted them into 3D to measure the number of galaxies at different times in the history of the universe. The analysis reached back more than 13bn years – very near the time of the “Big Bang” thought to have given birth to the universe.

 

A galaxy is a system of millions or billions or stars, held together by gravity, with planetary systems within them. Using new mathematical models, the astronomers were able to infer the number of “invisible” galaxies beyond the reach of telescopes, leading to the surprising realization that the vast majority are too faint and far away to be seen.

 

When the universe was only a few billion years old, there were 10 times as many galaxies in a given volume of space as there are today, the findings suggest. This in turn suggests that “significant evolution must have occurred to reduce their number through extensive merging of systems”.

 

https://www.theguardian.com/science/2016/oct/13/hubble-telescope-universe-galaxies-astronomy

 

My god, it's full of stars.  :D

[Њујоркер]

Novi Horiznoti nastavljaju dalje. Otkrivamo Mu...

After swooping past Pluto last summer, NASA says its New Horizons spacecraft has a new target: 2014 MU69. The agency this week revealed the spacecraft will travel 600 million miles over the next few years—about nine miles per second—before arriving at the distant Kuiper Belt object (KBO) on Jan. 1, 2019.

According to NASA, MU69 is currently situated in the “cold classical region” of the Kuiper Belt, which scientists believe contains some of our solar system’s most prehistoric material. As Amanda Zangari, a New Horizons post-doctoral researcher put it, MU69 is “one of the ancient building blocks of the planets.”

Scientists believe MU69, which measures about 20-30 miles in diameter, is about one billion miles beyond Pluto; New Horizons, meanwhile, is currently 3.4 million miles from Earth. Observations made by the Hubble Space Telescope suggest the KBO is a reddish color—possibly more red than Pluto, according to researchers.

The color is important because it gives scientists an idea of what type of Kuiper Belt object MU69 is.

In addition to details about MU69, NASA scientists also discussed new information regarding Pluto at the American Astronomical Society Division for Planetary Sciences (DPS).

One of the things scientists discussed was the possibility of clouds on Pluto, backing up evidence discovered earlier this year. Since its historic flyby, New Horizons has transmitted about 99 percent of its data and should complete the remainder by Oct. 23.

“If there are clouds, it would mean the weather on Pluto is even more complex than we imagined,” said Alan Stern, principal investigator from Southwest Research Institute in Boulder, Colorado.

[bigvlada]

Massive supernova visible millions of light years from Earth

 

California observatory spots dying star 10,000 times brighter than the sun before explosion in a spiral galaxy 160m light years from constellation of Pegasus

 

 

https://www.theguardian.com/science/2017/feb/13/massive-supernova-visible-millions-of-light-years-from-earth

[Prokleto Djubre]

Jebo te zivot, koliko implikacija ovo nosi sa sobom...

 

http://www.npr.org/sections/thetwo-way/2017/02/22/516431116/astronomers-find-7-earth-sized-planets-around-a-nearby-star

 

http://newatlas.com/seven-earth-exoplanet-red-dwarf/48056/

[bigvlada]

Predators :D

 

 

https://en.wikipedia.org/wiki/TRAPPIST-1

 

 

Da li će planete nazvati Gauda, Kamamber, Feta, Rokfor, Parmezan, Mocarela i Gorgonzola? :D

[Prokleto Djubre]

Da li će planete nazvati Gauda, Kamamber, Feta, Rokfor, Parmezan, Mocarela i Gorgonzola? :D

 

Ako jedna ne bude "Sremski", znacemo da je umesan Vatikan :D

[Arkadija]

Jelte, da li sam ja nešto propustila, da li je to neki trend u Srbiji, kada sam čitala komentare na vest o tih sedam planeta, jedno 85 % je sadržavalo izjave o Zemlji kao ravnoj ploči i raznim glupostima koje idu uz to?

[Prokleto Djubre]

Jelte, da li sam ja nešto propustila, da li je to neki trend u Srbiji, kada sam čitala komentare na vest o tih sedam planeta, jedno 85 % je sadržavalo izjave o Zemlji kao ravnoj ploči i raznim glupostima koje idu uz to?

 

To sto smo nasli planete koje su loptaste ne znaci da je dokazano da Zemlja nije ravna  

[Bujodrag]

Upravo tako. Zemlja je ravna jer nama (svi veruju da bi trebalo) je ravno sve do Kosova. 

I mozak je ravan i baš je lep kad je uredno ispeglan

[bigvlada]

Jelte, da li sam ja nešto propustila, da li je to neki trend u Srbiji, kada sam čitala komentare na vest o tih sedam planeta, jedno 85 % je sadržavalo izjave o Zemlji kao ravnoj ploči i raznim glupostima koje idu uz to?

 

Predinfarktno bulažnjenje religioznih fanatika, nebitno. 

 

 

Još dva članka na temu. 

 

https://www.theguardian.com/science/2017/feb/22/thrilling-discovery-of-seven-earth-sized-planets-discovered-orbiting-trappist-1-star

 

https://www.theguardian.com/science/across-the-universe/2017/feb/22/discovery-seven-planets-trappist-1-lottery-win-for-astronomers-looking-for-life-beyond-earth

 

Slike otkrivenih planeta, razmere su tačne, sem zvezda.

 

 

Ispada da će sa površine planeta ostale planete izgledati kao naš Mesec dok će zvezda biti mnogo veća. Bilo bi interesantno nagađati kakav oblik života bi mogao da nastane na takvim svetovima? Koliko je tamo na površini mračnije u podne nego ovde?

 

Ako jedna ne bude "Sremski", znacemo da je umesan Vatikan :D

 

Manje poznate vrste sira mogu da dobiju neki satelit. :)  Stilton otpada, oni više neće da se igraju sa ostalom decom. 

[Skyhighatrist]

Jučašnji press conference:

 

[porucnik vasic]

Какце бре слике?

[Ayatollah]

 

Slike otkrivenih planeta, razmere su tačne, sem zvezda.

 

 

Ispada da će sa površine planeta ostale planete izgledati kao naš Mesec dok će zvezda biti mnogo veća. Bilo bi interesantno nagađati kakav oblik života bi mogao da nastane na takvim svetovima? Koliko je tamo na površini mračnije u podne nego ovde?

 

 

Meni nije baš najjasnije kako su ovako velike planete mogle ostati na stabilnim orbitama, pri ovolikoj međusobnoj blizini. B i C se nalaze na samo 600 hiljada kilometara udaljenosti (manje od 2x do meseca), a imaju veći prečnik od Zemlje, pri čemu C ima i 40 % veću gravitaciju, a B svega 15% manju. Nadalje, B se nalazi na samo 1,6 miliona kilometara od matične zvezde, opet neverovatno da se održala na orbiti i oduprla gravitaciji zvezde. Može se to možda objasniti velikom brzinom revolucije, ali je onda pitanje kako se tako masivne, a brze planete nisu razletele od matične zvezde koja ima samo 10 % Sunčeve gravitacije.

 

Ne znam, čudan mi je ovaj sistem jako, nekako mi ne izgleda moguće, čak ni logično. Znam da gasovite planete imaju slične sisteme satelita, te da je ova zvezda verovatno jedva uspela da upali fuziju i da ne ostane braon patuljak, ali mi opet izgleda veoma neobično.

[vathra]

За ове насељиве планете година од 4-9 дана обећава кратка и умерена годишња доба.

 

Ајатола, систем јесте скроз чудан, зато су на њему и открили земљолике планете. На систему као што је наш би то било јако тешко, јер је маса планете мала, година дуга и било би потребно врло прецизно мерење да се открије померање звезде.

[Frile]

За ове насељиве планете година од 4-9 дана обећава кратка и умерена годишња доба.

 

Ајатола, систем јесте скроз чудан, зато су на њему и открили земљолике планете. На систему као што је наш би то било јако тешко, јер је маса планете мала, година дуга и било би потребно врло прецизно мерење да се открије померање звезде.

 

zar ne mere promenu sjaja zvezde kada planeta (planete) prolaze ispred nje?