|
|
desmonde
1/2/09
|
Ever since the days of astronomer Edwin Hubble's ground-based telescope observations, we have known that the Universe is expanding, and that there must have been a "Big Bang" where the expansion all started. But the question that has challenged astronomers, physicists, mathematicians, and philosophers for centuries is this: will the Universe expand forever or will it someday stop, turn around, and collapse in a "Big Crunch"? NASA missions are helping to gather the evidence required to answer this question conclusively.
Through the Wilkinson Microwave Anisotropy Probe (WMAP), we have been able to take a "baby picture" of the Universe - a picture taken a short 379,000 years after it was born in the Big Bang. WMAP surveyed the entire sky, measuring temperature differences of the microwave radiation that is evenly disbursed across the Universe. The picture above shows a map of the sky, with hot regions in red and cooler regions in blue. By combining this evidence with theoretical models of the Universe, scientist have been able to conclude that the Universe is "flat," meaning that, on cosmological scales, the geometry of space satisfies the same rules of Euclidean geometry that everyone learned in high school (e.g., parallel lines never meet, the ration of a circle's circumference to its diameter is pi, etc).
Observations with the Hubble Space Telescope (HST) get at another aspect of the Universe's expansion. Besides giving us a precise measure of the expansion rate, recent observations of very distant supernovae show not only that the universe will never stop expanding, but that itis actually accelerating-expanding faster and faster as time goes on, producing what has been called a "Big Rip." Since all matter should slow down the expansion and not accelerate it, this result was totally unexpected and indicted that most of the density of the Universe must be in the form on "dark energy," a weird form of energy whose gravity is the opposite of that for normal matter and energy.
The combination of WMAP and HST observations tell us that the Universe must be made up of 70% dark energy and 25% dark matter (a form of matter unknown to science), and that only 5% is the normal matter we are familiar with-the matter that makes up stars and planets and everything else we see.
Should this accelerating Universe picture prove true, then we may expect that in only 100 billion years, our Milky Way Galaxy will find itself alone in an empty Universe. The accelerating expansion, which has already been going on for 6 billion years, will propel all of our galactic neighbors beyond the horizon of the then-visible Universe. We will be left utterly alone for the rest of eternity.
Reply
|
|
|
|
EarthPerson9
11/24/09
|
That is very intersting.
Can you please let us know the reference citations for several of the published articles so we may also read them?
Reply
|
|
|
|
|
Magoonski
11/24/09
|
What if dark matter and energy is actually stuff from outside our universe? Kind of like when making a dumpling...think of our universe as the dough and the stuff 'outside' our universe as boiling water. The affect of the boiling liquid on the dumpling makes it expand, just like the affect of the stuff outside of our universe MAY make it expand. The dark matter and energy would be, metaphorically speaking, similar to the heat and water getting into the dumpling.
Of course if you leave a dumpling to boil too long it will eventually breakdown and disband evenly in the pot making a big mess but for all we know, once our universe becomes "overcooked" and breaks apart there will be more life, lights, etc...maybe (assuming our atoms will remain stable) we'll just become part of an even larger and more crowded place.
As for how the "stuff" leaks in...maybe it comes through black holes. I know that black holes can suck in light but do they have an affect dark matter and dark energy?
Reply
|
|
|
|
|
paradigm
10/23/09
|
The big bang theory is based on interpreting the red shift phenomena as a Doppler Effect. However, this interpretation is wrong.
The light from our Sun is known to be red shifted, and the Sun is not accelerating away.
The red shift in the light from the Sun is called a gravitational red shift.
The light from galaxies is also a gravitational red shift and not a Doppler Effect.
The gravitational field of the Sun and the Galaxies is actually an emission field.
The emission (radiation) of the Sun is the basis of its emission field.
The Earth also has an emission(gravitional)field.
The cause of gravity is the absrotpion and exchange of emisssion via the emission fields of objects.
Everything from the smallest possible particle to the largest galaxy has an emission (gravitational) field.
Electrostatic attraction is also gravitational attraction.
The idea that gravity only operates at the macroscale is wrong.
All of this is presented in the essay 'An Infinite Moment in Time".
This is located at: http://members.westnet.com.au/paradigm/forever.pdf
Reply
|
|
|
|
|
sidhudavinci
10/23/09
|
I think the universe would dissolve and disappear into the darkness.All the matters are moving away from each other and it needs more and more gravitation to pull them back. I cant think the full of this, can any one give an idea what happens next.
Reply
|
|
|
|
|
paradigm
10/8/09
|
The Universe is not expandig, and did not begin with a big bang.
The big bang theory is based on interpreting the cosmic red shift phenomena as indicative of a Doppler Effect and the galaxies accelerating away.
However, the light from our Sun is also red shifted and the sun is not accelerating away.
Physics tries to get around this obvious point by claiming that the red shift in the light from our Sun is "gravitational".
Which it is.
The red shift in the light from galaxies is also gravitational.
Red shift is indicative of the way in which light travels through being constructed into wavelength of increasing width and decreasing density.
To claim that the red shift in the light from galaxies is not gravitational is to claim that they do not gravitational fields. Which is plan silly.
Gravitational fields are equivalent to emission fields.
Everything has an emission field.
The cause of gravity is the obsorption and exchange of emission by objects.
The Earth absorbs the emission (field) of the Sun via its emission field.
If you want to know more about the paradigm (theory) that integrates science, then it's presented in the essay, "The Logic of the Universe", located at: http://members.westnet.com.au/paradigm/forever.pdf
paradigm
Reply
|
|
|
|
|
Karthik
9//09
|
I think whatever is said is true. Universe is expanding. It all started from a single point with high density. After sometime that point got exploded which resulted in expansion of the Universe.
Reply
|
|
|
|
|
Ritwik
8/14/09
|
Hey, i just dont believe this "BIG BANG" theory. its weird to think that we all that exists was born from a BANG. "Energy can neither be created nor be destroyed."
Similarly, the universe always existed. Also, we can never prove that the universe is constantly increasig.
What do u say?
Reply
|
|
|
|
|
Streona
8/5/09
|
I am not sure about the "Big Rip" ? Would this casue a tear in the fabric of the Universe so that the matter etc. in the Universe would be dragged back into an enormous black hole to collide in the manner of a Big Crunch ?
Reply
|
|
|
|
|
ravigopal
5/23/09
|
Hai,
my name is gopal studing tenth class in narsapur.
i have doudth above space.
that is;-
energy can travel in space or not?
Reply
|
|
|
|
|
EarthPerson9
11/23/09
|
Yes, Gopal, energy can travel in space because space, time, energy, and mass (matter) are interconnected based on the graviational theory of Albert Einstein. There are several forces in Nature and much work based on Einstein's theories. It is complex and as you learn more mathematics and physics it will become apparent.
Reply
|
|
|
|
|
subhendu9791
6//09
|
Energy in the form of waves live gamma rays,x-rays can travel in space. They travel in small tiny packets of energy called quanta (you need to know about quantum theory).
Reply
|
|
|
|
|
Alexander
4/10/09
|
Wow i knew some of that which was explained in the body of the message but you added to that knowledge thanks for the new conversation starter.
Reply
|
|
|
|
|
JohnEDPMalin
1/7/09
|
Thank you for your lucid insight. It is haunting to think that dark energy 'manufactures' space.
Reply
|
|
|
|
|
scbrow
1/6/09
|
I think a better explanation for the accelerating expansion of our universe is just plain old gravity. We don't need to invent a new force of nature or surmise the existence of matter we cannot measure to explain the acceleration.
It is perfectly plausible that there are other universes out there - each of which came to be with its own big bang.
In fact, they could be all around us - with their gravity pulling the matter of our universe closer and closer to each of them as time passes.
Reply
|
|
|
|
|
Alexander
4/10/09
|
That is another intresting subject that could be argued till we all died of old age but it's still something to think about when your bored. or just maybe you just have the time to think about something as cool as this.
Reply
|
|
|
|
|
JohnEDPMalin
1/7/09
|
There are further details you are missing in your Astronomy 101 class. Newtonian gravity does not predict what observation attests, hence appealment to Dark Energy.
Reply
|
|
|
|
|
ChrishTiyan
9/16/09
|
Songs that will inspire you and lift your spirit up for God. Listen to Kim Clements songs of praise. He is a modern prophet.
Reply
|
|
The fate of our Universe