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Mariuslol Norway. Mar 01 2011 19:02. Posts 4742 | | |
Always cool to study Astronomy a little, I did this evening, thought I'd share =]
Galaxies
- 200 billion known Galaxies in the known universe.
- Our Galaxiy, The Milky Way, 12 billion years old.(Huge disc with giant spiral arms, and a bulge in the middle)
Born in nebulas, born in clouds of dust and gass.
* Pillars of creation.
* Around many of them are planets and moons.
(We humans thought for a very long time the milky way was the only one until 1924, until Hubble found out otherwise).
He found fuzzy blobs of lights, far far away, whole cities of stars, galaxies, way beyond The Milky Way.
Random Facts
- M87, a giant elyptical galaxy, one of the oldest in the Universe, and the stars all glow gold!
- Sombrero Galaxy, has a huge glowing core, with a ring of gass and dust all around it.(Baal Galaxy?)
- Galaxies are big, really really big.
Some distances and perspective
On earth we meassure distance in kilometers, in space astronomers use lightyears. The distance light travels in a year, which is just under 9,5 trillion kilometers.
- Our Galaxy is 100.000 lightyears across, which is just a small spec in the universe.
- Our nearest neighboer, Andromeda is nearly 200.000 lightyears across, twice the size.
- M87 is much much bigger than Adromeda, nearly 5 times as big.
- But all of these are tiny compared to IC 1011, biggest galaxy ever found. 60 times larger than our Milky way.
- The first stars formed 200 million years after the Big Bang ( 13,8 billion years ago).
- Then gravity pulled them together, building the first Galaxies.
Mankind's incredible tenacity and creativity
Whatever we see in telescopes today are things that has happened millions or more years ago, because it has taken the light as long to get to us. The feint smudges, formed 1 billion years after the big bang is the furthest back Hubble can see.
Until recently, humankind made Act, a 500 meter tall telescope, and the largest in the world. Act doesn't detect visible light, it detects cosmic microwaves, from the time the Universe was a few hundred thousands year old.
It doesn't just detect early Galaxies, it can see how they grew. The footprints of all the growth, from a few hundred thousand years till now.
Letting Astronomers see how they form and evolve: Stars form cluster, forms to galaxies, which builds into clusters of galaxies which builds into super clusters of Galaxies.
- In the beginning Galaxies looked like poo, random and bulgy, now they look awesome and perfect. Gravity, gravity shapes and molds Galaxies
Unimaginable Power
- There's an unimaginable powerful and incredible destructive source of gravity at the heart of most Galaxies. And there's one at the deep center of our own milky way.
- For years scientists wondered what could be powerful enough to change how a Galaxy behave, and then they found out.... A black hole, not just any kind, a super massive black hole.
* It eats gass and stars, but sometimes black holes consumes too quickly, and what they are consuming are dispatched back into space in beams of pure energy.
* This is called Quasar, when they find one, they know the center has a Super massive black hole.
- The black hole in the center out of Galaxy is gigantic, 24 million kilometers across.
* Even though, Earth is in absolute no danger, since Earth is 25.000 lightyears away (trillions of kilometers). So the earth is safe... For now....
Dark Matter
Super massive black holes may be the source of huge amounts of gravity, but they don't have enough power to hold a galaxy together, according to the laws of physic, a galaxy should fly apart. Why don't they?
Because there's something out even more powerful than a super massive black hole. It can't be seen, and virtually impossible to detect, but it's there. And it's called dark matter, and it's everywhere.
- Scientist are discovering that dark matter doesn't just hold em together, might have sparked them into life as well.
- They think dark matter was created into the Big Bang, and that dark matter became the seed of the Galaxy, even though they have no idea what it really is and no idea what it's made of.
- They think that dark matter weight for weight make up for x6 as much as all other matter in the Universe.
Recently it's been detected in deep space, it bends it, in a process called gravitational lensing. Allows us to detect the pressence of dark matter. As a beam of light is travelling towards us, if it passes by dark matter, it gets deflected around it by the gravitational pull.
Triggers the birth of galaxies, and keeps them together, scientists call it, the master of the Universe.
Unfathomable vastness
Scientist have come so far, they've built almost the whole Universe in a super Computer. Here you can't see individual Galaxies, can't even see clusters. But what you can see is Super Clusters, linked together in filaments, in a vast cosmic web. One finds a cosmic web which lights up all of the Universe, making the Universe looks like a gigantic spunge.
Each of the filaments is home to millions of Galaxy clusters, all bound together by dark matter. In the simulation, the dark matter glows along the filaments.
Dark matter effects where in the Universe Galaxies will form, holds together the whole superstructure of the Universe, binds them in clusters, and clusters in super clusters. All are locked in a web of filaments, and without it, the whole structure of the Universe will fall apart. This is the big picture of our Universe.
It's a giant cosmic web, and hidden deep within one of these filaments are our Milky way.
Dark Energy
In recent times, the last decade scientists found something new, kinda scary. Dark Energy, far more mysterious than dark matter, since we don't have the slightest idea what it is or what it's doing. Like space has little springs in it, make things repell eachother and pushes things apart.
If Dark Energy wins vs Dark matter, it make Galaxies spread apart and push things away from eachother. But that's not going to happen for a very very long time (trillions of lightyears).
Fantastic time to live in
We're extremely fortunate, life has only evolved on earth because our tiny solar system was born in the right part of the Galaxy, any closer to the center, we wouldn't be here. Since life there is extremely lively, radioactive.
To far away from the center would be just as bad, ain't as many stars, we might not exist at all. We're not to far, not too close, perfect distance.
Endless questions to ask, and mysteries to solve. More and more scentists are focusing on Galaxies, it's amazing time to live in, where we're making the most extraordinary discoveries imaginable
ps,
+ Show Spoiler +
The Milky Way is on a collision course with Andromeda, and since the bigger of galaxies crashing eats and consume the smaller, Milky Way will lose. Which is doomsday of our own Galaxy, but according to Astronomers it'll be amazingly beautiful.
pps,
+ Show Spoiler +
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Mariuslol Norway. Mar 01 2011 19:04. Posts 4742 | | | |
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maryn Poland. Mar 01 2011 19:09. Posts 1208 | | | |
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Gigabeef United Kingdom. Mar 01 2011 20:22. Posts 111 | | |
Well if we are talking about galaxies, I bring you Sextans A, the square galaxy!
enjoy |
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YoMeR United States. Mar 01 2011 21:24. Posts 12438 | | |
so when do we find aliens wtf. |
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JSquids United States. Mar 01 2011 21:34. Posts 1142 | | | |
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| AKA StarsNStripes@azeroth | |
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NewbSaibot United States. Mar 01 2011 21:34. Posts 4946 | | |
| | On March 01 2011 19:22 Gigabeef wrote:
Well if we are talking about galaxies, I bring you Sextans A, the square galaxy!
enjoy |
Looks more diamond shaped to me |
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NewbSaibot United States. Mar 01 2011 21:40. Posts 4946 | | | |
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Bigbobm United States. Mar 01 2011 21:53. Posts 5511 | | |
how much of a nerd am i that i knew like 95% of those facts already
still love astronomy etc and good read |
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| Its time to stop thinking like a bitch and think smart like a poker player - ket | |
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Bigbobm United States. Mar 01 2011 22:00. Posts 5511 | | |
| | Fantastic time to live in
We're extremely fortunate, life has only evolved on earth because our tiny solar system was born in the right part of the Galaxy, any closer to the center, we wouldn't be here. Since life there is extremely lively, radioactive.
To far away from the center would be just as bad, ain't as many stars, we might not exist at all. We're not to far, not too close, perfect distance.
Endless questions to ask, and mysteries to solve. More and more scentists are focusing on Galaxies, it's amazing time to live in, where we're making the most extraordinary discoveries imaginable
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this part is pretty lol though
the only good part is that we didnt come into existance like 10 billions years later when galaxies are so much farther away and that much harder to learn from. plus sky would be super dark |
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| Its time to stop thinking like a bitch and think smart like a poker player - ket | Last edit: 01/03/2011 22:37 |
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Newblish Canada. Mar 01 2011 22:37. Posts 560 | | | |
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| Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds that Darkness is always there first, waiting for it. | |
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Mariuslol Norway. Mar 02 2011 05:13. Posts 4742 | | |
| | On March 01 2011 20:34 NewbSaibot wrote:
Show nested quote +
On March 01 2011 19:22 Gigabeef wrote:
Well if we are talking about galaxies, I bring you Sextans A, the square galaxy!
enjoy |
Looks more diamond shaped to me
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I thought so too at first, then I tilted my head a little to the left, and BLAM!!, square xD |
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Jun Croatia. Mar 02 2011 05:38. Posts 825 | | |
I skip lessons all the time but I remember not missing a single lesson of astronomics.
Extremely fascinating, nice read |
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| :D | Last edit: 02/03/2011 12:23 |
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Mariuslol Norway. Mar 02 2011 12:48. Posts 4742 | | |
"So forget Jesus, the Stars died so that you could be here today."
Loving it, awesome clips guys xD |
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Loco Canada. Mar 02 2011 17:53. Posts 20967 | | | |
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| fuck I should just sell some of my Pokemon cards, if no one stakes that is what I will have to do - lostaccount | |
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milkman United States. Mar 02 2011 21:15. Posts 5719 | | |
well see how much your "science" helps you when your stuck in hell for eternity |
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| Its hard to make a easy buck legally, its impossible to make a easy buck morally. | |
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