beansbaxter
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posted May 10, 2004 11:16 PM
Another Physics Lesson - Part 5
Most physicists presume the universe began as a "Big Bang" after which all matter and energy resided in an unimaginably hot ball of plasma. This ball expanded, and after about 4-hundred-thousand years cooled sufficiently to allow the photons to escape. These photons we now detect and call the "cosmic microwave background" (CMB). No matter what part of the sky we look at, we see almost the same CMB brightness (intensity). This means that the universe appears to be flat. By flat, I mean that if one were to draw a very large triangle of cosmic proportions, the internal angles would add up to 180 degrees. If the universe were curved, the angles would not sum to 180, but to a greater or lesser number. Hubbell was one of the first to notice that the further a galaxy was away from us, the greater the spectrum of emitted light was shifted to a lower energy. This is due to the fact that a photon emitted from an object moving away at a great velocity is seen by us as having less energy, or a change in color. In other words a blue photon might be seen as being red. This phenomenon was termed "red shift". By analyzing the light from stars in distant galaxies, and comparing their spectrum with similar, nearby stars, we can determine their relative velocity; the speed they are moving away from us. This method fails when viewing the most distant galaxies, as it is not possible to view individual stars. Astronomers have turned to studying super novas with known properties to extract data indicating the expansion velocity of the universe.
The amazing result was, not only is the universe expanding, it is expanding at an accelerated rate. The properties of a curved universe could be used to indicate the expansion only seemed to accelerate. A flat universe implies the acceleration is real!
There is no known form of energy that can cause the acceleration, so "Dark Energy " is the term used to describe this unknown force. One of the properties of dark energy is that it must act in opposition to the gravitational force. Since matter and energy are interchangeable terms, the density of the universe could be called "energy density", useful since it's more descriptive of the conditions of the primordial fireball. Briefly, the history of our universe might be:
The expansion of the early universe resulted in the same amount of energy distributed more or less equally throughout a greater volume of space. The energy density decrease means the universe was cooling and eventually matter was condensed from its constituents. As it continued to expand, local gravitational anomalies allowed the formation of gas clouds that eventually formed the early stars of the most distant galaxies. Continued expansion further decreased the energy density until about 4 billion years ago the energy density dropped below that of dark energy. The previous rate of expansion then changed to an accelerated rate. Some physicists believe this will eventually lead to the "Big Rip". The Big Rip may occur when the universe is about 20 billion years old. The stars will separate from the galaxies as their gravitational attraction is overwhelmed by dark energy. In the last 30 seconds, atoms will be torn apart with the process continuing until there is only dark energy.
   
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DB
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posted May 10, 2004 11:38 PM
beans, the big bang theory just does not work. For answers for the big bang theory and others like it see www.answersingenesis.org
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Dan
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beansbaxter
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posted May 11, 2004 12:09 AM
 Edited By: beansbaxter on 11 May 2004 08:05
This thread is just about an expanding universe, from a scientific standpoint. I am trying to figure out if it is still expanding today.
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DB
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posted May 11, 2004 12:30 AM
beans, you say that you're 100% Christian but you do not believe what the bible says. Example being: apparently you believe in a 'big bang theory' which says 'chaos' or 'nothing' (depending on which big bang you believe) went bang and over billions of years humans now stand. The bible clearly states otherwise: in six days all things were created from nothing.
Even the most staunch evolutionist will agree with entropy (that the earth is dying down) but evolution, even theistic-evolution has everything becoming better and better with evolution.
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frEEk
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ummm... yeah
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posted May 11, 2004 12:30 AM
oh geezus, please don't make me think. i get all weirded out when i think.
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DB
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posted May 11, 2004 12:35 AM
Not much to think about really freek, just a little common sense: how can nothing go bang and creat everything?
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Dan
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DB
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posted May 11, 2004 12:36 AM
it's just not possible
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Dan
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DB
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posted May 11, 2004 12:37 AM
nothing plus nothing equals...........
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Dan
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DB
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posted May 11, 2004 12:37 AM
nothing
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Dan
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DB
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posted May 11, 2004 12:44 AM
look at your watch. What do you see? You see something that had to be designed, pieces created and then assembled. Let's just do away with 2 of the 3. Let's do away with the designing part and the part about making the individual pieces. Now you have a box of pieces that need assembling. Now shake your box of pieces until it forms your watch. I hope you have a long time because it will never happen.
Look around, the universe and ALL it contents were designed and created by an intelligent designer.
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Dan
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beansbaxter
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posted May 11, 2004 06:06 AM
Edited By: beansbaxter on 11 May 2004 08:05
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your car is slow
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posted May 11, 2004 06:27 AM
creationists are an odd breed....and should all be slapped upside the head.
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lrg
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posted May 11, 2004 07:58 AM
Edited By: lrg on 11 May 2004 09:02
quote:
beans, you say that you're 100% Christian but you do not believe what the bible says. Example being: apparently you believe in a 'big bang theory' which says 'chaos' or 'nothing' (depending on which big bang you believe) went bang and over billions of years humans now stand. The bible clearly states otherwise: in six days all things were created from nothing.
Even the most staunch evolutionist will agree with entropy (that the earth is dying down) but evolution, even theistic-evolution has everything becoming better and better with evolution.
Nothing in the bible contradicts science. Evolution is as much science as belief in God is. You have to make some pretty bike leaps of faith to believe in evoloution.
Everything in the bible is not literal and you will find few who view it that way.
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beansbaxter
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posted May 11, 2004 09:49 AM
oh here we go...you had to bring lrg into it....
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frEEk
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ummm... yeah
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posted May 11, 2004 10:49 AM
not gonna get into it DB. i dont know what i believe cause i know nuttin. but i ain't one to take the word of any book (religious or scientific or otherwise) as absolute truth. just dont make sense to me.
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Ninjaman12R
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posted May 11, 2004 10:56 AM
I agree freek...
I agree 100% freek.
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What we're dealin' with here is a complete lack of respect for the law.
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Otis
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posted May 11, 2004 11:06 AM
All I know that is the truth is that in 5 DAYS I AM GOING RIDING IN THE MOUNTAINS WITH MY BROTHERS, THE SMACKHOUSE CREW!!! Yeah Bitches!!!
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Ninjaman12R
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as a Deal's Gap tour guide.
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posted May 11, 2004 11:13 AM
Someone....
Someone is MORE than a tad fired up about DGVII!!! Damn Otis, it's almost GO TIME !!!!!!!!!!
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What we're dealin' with here is a complete lack of respect for the law.
Sheriff Buford T. Justice of TEXAS
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