simulated meteor strike

[Lamp]

Astronomy joke

Antares isnt fat, its just big boned!

The other stars: Haha, look at Antares, hes a fat bastard

Antares: STFU ! I'm only fat cos every time I fuck your mum she gives me a biscuit !

 

[Svartmetall]

The other stars: Haha, look at Antares, hes a fat bastard

Antares: STFU ! I'm only fat cos every time I fuck your mum she gives me a biscuit !

rofl

 

[Bugz]

Interesting...

 

[Kathal]

vgr = c / vph

If a wave solution has a frequency dispersion it will take the form of a wave packet which travels at the group velocity which is less than c. Only its wave trains travel at the phase velocity. It is only possible to send information with such a wave equation at the group velocity so the phase velocity is yet another example of a speed faster than light which cannot carry a message.

What about the msg: "Eat dust slowbie vgr"?

 

[Blow]

Antares is biggest that is known by human people? or is there something bigger that we know

 

[cog]

The last slide on that site contains the star Antares, which is 510 times the diameter of our sun.

This is dwarfed by the star W Cephei, which is 1900 times our sun's diameter If it replaced the Sun in our solar system it would extend to the orbit of Saturn !!! It is 315,000 times as luminous than our Sun.

!!!

 

[confused]

A "real meteor strike" as in, an advert for the new toyota truck

Did you see that truck on top gear, can withstand anything...

 

[DocWolfe]

the universe is infinate... therefore it is possible for a star to be billions of times bigger than antares or even a billion times smaller than the sun

 

[MesS°]

Antares is biggest that is known by human people? or is there something bigger that we know

Thats human's, people. Show him a planet bigger than you can even comprehend and hes still gonna ask if there is anything bigger.

 

[Lamp]

Antares is biggest that is known by human people? or is there something bigger that we know

No. Antares is not the largest star. W-Cephei is the largest known star. Or one of them. Stars like W Cephei and Betelgeuse have tremendous diameters but they are not the most massive in the universe. At just 25 solar masses, such supergiants would look like wimps in a weigh-in against stars that can be up to 150 times the mass of the Sun.

The heaviest, brightest known star:
http://www.space.com/scienceastronomy/brightest_star_040106-1.html

What is the largest star ?
http://curious.astro.cornell.edu/question.php?number=377

 

[Lamp]

the universe is infinate... therefore it is possible for a star to be billions of times bigger than antares or even a billion times smaller than the sun

The smallest star is Timmy Mallett

 

[elisera]

The smallest star is Timmy Mallett

lol :worthy:

 

[Lamp]

the universe is infinate... therefore it is possible for a star to be billions of times bigger than antares or even a billion times smaller than the sun

Actually....thinking about it...hasn't a star got to be a certain mass / size as a minimum in order to qualify as a star ? Thought I read something about that. If they are too small they turn into mushrooms or something...

Edit: yeah - just found something on this:
http://www.astronomycafe.net/qadir/q330.html

 

[GReaper]

More details on the April 2029 asteroid are available on wikipedia:

http://en.wikipedia.org/wiki/99942_Apophis

 

[snushanen]

the universe is infinate... therefore it is possible for a star to be billions of times bigger than antares or even a billion times smaller than the sun

The univers is not Infinate. It actualy have a size, you can calculate it by multipling the time it has existed with the growing speed. The universe had zero space aprox 13 billion years ago at the time of "big bang". We know that the universe is expanding at this very moment because we can observe the "doppler-effect" on our neightbour galaxies, but we arnt sure if it wil continu to expand or colapse after a wile .the growing speed of the universe is also calculated by the doppler-effect.

The biggest stars this universe has seen is dead long ago we belive. The super-massive stars was born in the early age of the universe and they have provided us with super massive black wholes witch are the sentre of many of our galaxies today.

And a star has a maximum size limit because the bigger a star is, then shorter it lives. Like our sun has aprox 10-12 billion year life time (It is in its mid-life crisis atm with an age of 6 billion years ). A smal red star lives much more longer then our sun ( some of the smal stars form the first generation of stars are still alive). And the biggest stars only live for a couple of million years etc. So a uber big star wouldnt be stable and die very quick

Some of this might not be 100 % correct. I am only on the highschool level of physics yet.

 

[Ingafgrinn Macabre]

Actually, no. That's what the star looked like x years ago, where "x" is the amount of light years the star is from earth. The light emitting from that picture is millions of years old. The distance light travels in one year is known as a light year. Its a VAST distance. Millions of light years are beyond comprehension in earthly terms.

That is what the star looks like right now. It might not be what the star _is_ right now but to us it _looks_ exactly like that...

 

[Ingafgrinn Macabre]

the universe is infinate... therefore it is possible for a star to be billions of times bigger than antares or even a billion times smaller than the sun

If the universe is infinately big, that would mean that there would be an infinate number of stars and planets. And the infinite number of possibilities that exist here on this planet would have occurred an infinate number of times on infinate planets.
So if you walk outside your door tomorrow, and can't decide to go left or right... rest asure that there will be a you who has chosen the other way than you will so you won't miss anything

(and there _will_ be an ezteq that has shown her jubblies on freddy's somewhere in the infinate universe )

 

[old.Tohtori]

If the universe is infinately big, that would mean that there would be an infinate number of stars and planets. And the infinite number of possibilities that exist here on this planet would have occurred an infinate number of times on infinate planets.
So if you walk outside your door tomorrow, and can't decide to go left or right... rest asure that there will be a you who has chosen the other way than you will so you won't miss anything

(and there _will_ be an ezteq that has shown her jubblies on freddy's somewhere in the infinate universe )

Actually that's when we have to think of universeS.

Then we get an infinite number of stuff.

As such, this universe is a bit limited, but still huge, so probably everything you can imagine is around here.

 

[Lamp]

When we talk of the word "universe" within the concept of infinity, you need to define what you mean.

In my personal opinion, I think the Void is infinite. The Void is the name I give to the primordeal nothingness that Everything is in. I think there are a multiplicity of universes. The 15 bn light years that we on earth can discern is "our" universe. Or, our cosmic neighbourhood. The big bang triggered our universe. A previous big bang was the catalyst for our big bang. I believe there are regions of space which are big bang nurseries. Unimaginably huge areas in the Void. I also believe that our basic concept of physics works only for what we humans can comprehend.

We can't even explain how the physics of black hole singularity is possible. Simply put, our theories of physics break down at the singularity. We need a unified theory of quantum gravity to explain how a region can be infinitely dense, and I think we are probably 1000 years away from coming up with a theory on that baby ! Not in our lifetime or in 100 lifetimes will humans be able to comprehend that. Anyway, I digress.


I believe that there are physics which enable something to be created out of nothing. Hence you dont need the concept of a creator or god for the universe to happen.

OK I might be wrong.

But what if. Just what IF I'm right. What if there are physical processes by which matter can be created from nothingness....?

Have a nice day

 

[snushanen]

In my personal opinion, I think the Void is infinite. The Void is the name I give to the primordeal nothingness that Everything is in. I think there are a multiplicity of universes. The 15 bn light years that we on earth can discern is "our" universe. Or, our cosmic neighbourhood. The big bang triggered our universe. A previous big bang was the catalyst for our big bang. I believe there are regions of space which are big bang nurseries. Unimaginably huge areas in the Void. I also believe that our basic concept of physics works only for what we humans can comprehend.

We can't even explain how the physics of black hole singularity is possible. Simply put, our theories of physics break down at the singularity. We need a unified theory of quantum gravity to explain how a region can be infinitely dense, and I think we are probably 1000 years away from coming up with a theory on that baby ! Not in our lifetime or in 100 lifetimes will humans be able to comprehend that. Anyway, I digress.

Yes i agree on your theory that we might have a lot of universes, our Big bang stared in what we call a singularity. As you have stated we cant explain singularities with our laws of physics. Some sienticts belives that black holes in our universe works as "bing bangs" for other universe in other dimensions. Maybe our universe started with a singularity from a black hole in an already existing universe witch also was created from an already exsiting universe and so on.

We cant observe other universes atm. maybe they just are very far away. Or maybe they exist in other dimensions that we just cant observe.
Our universe is defined by what we can observe and where our laws of physics are valid. I agree with you on the "void" theory. The "Void" is i belive is infinate and it dosnt necisarly follow a set of laws like our universe. Maybe our neightbour universes have other physic laws. Or maybe their natural forces behave differnt. Example: In our universe the electromagnetic force is aprox 10^20 (1 with 20 zeros) stronger then gravity. Perhaps in another universe, the gravity is stronger then electromagnetism, who knows?


I also agree with you that we are pretty far away from discovering GUT ( great unifying theory). Maybe we will never be able to find a theory of that kind.

And your theory of creation without adding energy or anything (nothingness) would not apear in our universe because our theories dont allow mass or matter to be created without huge amounts of energy. But if we combine your theory of creation from nothingness with my theory that says that the "void" and other universes dont have to follow our laws of physic at all. Things could apear from nothing there even if its impossible in our observebal universe

Anyway i dont disagree with what you say Lamp. I just wanted to add some of my theories to your subject I find this stuff extreamly innteresting and as stated earlier i am only on high school level of physics but intend to move to the university level in a couple of years and study physics

 

[Lamp]

Great post, Snush.

In a funny kind of way, us (humankind) being limited to its own concepts of physics and only being able to know about stuff 15bn light years around us, works out quite well. We're mortal. We live - what ? 100 years tops ? Even if we live to be 1,000 years old, because of the H U G E distances involved, we'll be dead from old age before we get anywhere. One light year is a vast distance.

 

[Svartmetall]

That is what the star looks like right now. It might not be what the star _is_ right now but to us it _looks_ exactly like that...

Yep. It could have gone FOOOM! 3,000 years ago already, but we wouldn't find out about it for another 4,500 years...