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Do you think space aliens really exist?
| Definitely. Every ten years I have those strange circle marks in my corn field. |
| [ 1 ] 5% |
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| Halo has convinced me they exist |
| [ 0 ] 0% |
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| Maybe |
| [ 9 ] 50% |
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| You'd really have to be really stupid to believe they do |
| [ 8 ] 44% |
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Total Votes : 18 |
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| Hazael |
 Posted: Fri Nov 17, 2006 12:26 pm |
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Joined: 04 Jan 2006
Posts: 444
Location: Up North
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I love astronomy!
So life on other moons might exist. This IS a possibility, but let me tell you how possible it is. Scientists believe that life (as we know it) can only exist with water. Lucky water is possibly the most abundant resource in the universe, but it needs to be found in perfect conditions.
Stability
The life-giving star must be stable. It cannot experience large-scale energy changes. Large scale energy fluctuations do not allow life to get a reasonable foothold and advance to higher levels before being terminated.
Star life
The life-giving star must be long-lived for evolution to have sufficient time to get to this level. Any stars much above the G class will burn too rapidly and die before life on their surrounding planets or moons could advance very far.
Single
The life-giving star needs to be single. 2/3rds of stars are paired as binary systems. These binary systems present obstacles for a planet which would bear life. Inside the Roche limit (limit at which the satellite of a body would be ripped apart by gravitational forces) of the binary system, the planetary would never coalesce into a planet. Planets which might form outside the Roche limit would receive irregular radiation during its orbit around the pair. Additionally, binary star systems do not allow planets with circular orbits to form there.
Size
The star cannot be too small since the smaller size would require the planet to orbit closer to the sun in order to be in the habitable zone where water can exist in the liquid state. If the planet orbits close to the sun, tidal interactions would slow the planet’s rotational until one side always faced the sun, thus baking/freezing any life out of existance. (our moon experiences tidal forces with Earth.... one side always faces us.)
Elements
The star must be at least a second generation star from a previous supernova explosion. Stars forge elements heavier than hygrogen in their cores. All elements up to iron can be made by different fusion pathways, provided the core density and temp. are high enough. Stars like our sun will never fuse iron because our sun lacks the necessary mass to generate enough gravitational pressure to make the core temperatures high enough for iron fusion. Giant stars which do make iron find this to be the end point of fusion pathways because the iron nucleus absorbs energy instead of releasing it. Only when giant stars explode do energy levels rise high enough to manufacture all the heavier elements above iron on the Periodic Table, and soon the explosion dissipates and whatever is made during the short explosive burst is done being made. Heavy elements like gold, silver, and lead are exceedingly rare on Earth because they can only be made when a star goes supernova. Since supernovas are not all that common because giant stars are rare, then a planet like Earth with its heavy elements is very rare in the universe. The only Godless explanation for Earth’s most precious natural rexources is if a supernova happened long ago and our sun collapsed from the debris. First generation stars (those formed immediately after the big bang) are composed of hydrogen and helium and any planets around them contain ONLY those two elements. This essentially rules out all of the ancient M-class stars which are so abundant in the universe as candidates for life since their solar systems only contain the lightest elements.
Protoplanetary disk
The host star must be surrounded by a protoplanetary disk which is of a small size and short life span. Large protoplanetary disks are typicaly swallowed by the host stars and planets do not form.
CO2
Stars typically heat up as they age, and our sun is thought to have been 30%? dimmer when the Earth was first formed. While the sun was warming, the Earth’s greenhouse gases were disappearing. the greenhouse gases early on served to trap solar radiation and keep Earth’s global temp. warm, but as they disappeared, the sun was warming such that the Earth managed to stay within small temp window. When plant life appeared on Earth, carbon dioxide levels were reduced at just the right time with the increased solar heat. If these changes in Earth’s atmosphere and solar radiation did not occur at just the right time, Earth would have experienced global glaciation or runaway greenhouse effect.
Time
The evolution of intelligent life required tremendous time. If a nearby star goes supernova, it is good-bye life on this planet due to overwhelming radiation. Imaging the odds that one has not happened nearby during the past few billion years. Our galaxy appears to have lobes of invisible matter through which our solar system passes in its orbit around the galactic core. We should have gone through these lobes of material 40 TIMES without negative interactions. That we have safely passed through so often is incredibly fortunate. Since large elliptical and irregular galaxies appear to lack these lobes, it is reasonable to think that those galaxies will not readily reshuffle stellar material, and therefore not generate many new stars, and therefore will be dominated by first generation stars, and that these entire galaxies are not candidates for the evolution of life.
Distance
The planet/moon must exist in the "habitable zone," which is the particular orbital distance from the star where water exists in liquid state. There are a few obstacles to this zone.
If the Earth were 5% closer to the sun, it would have experienced runaway greehouse. If Earth were 1% farther away, extreme glaciation would haved covered the Earth.
The orbit must be nearly circular. The seasonal extremes from greatly changing orbit aphelion and perhelion would have over-heated in summer and frozen in winter.
Even within the habitable zone, it is the spin rate which is the all important factor in determining weather.
The habitable planet must be large enough to hold an atmosphere, but not so large that gravitational forces crush things.
The habitable planet needs a large moon to prevent gravitational forces from another large planet. Earth’s moon prevents Jupiter from altering its spin axis. The Earth’s moon is much larger relative to the planet than any other in the solar system.
Protection
The planet for life must have a large planet with a circular orbit within the same solar system. The large planet is nessary to act as a vacuum cleaner for stray objects which might otherwise strike the planet’s surface and cause global extinction. Jupiter protects Earth from strays, and if it were not present, we would expect mass extincion far more frequently. If Jupiter were in a more elliptical orbit, its gravitational influence would either eject or destoy Earth.
Crust
The planet must have an active crust. The Earth is the only planet/moon in the solar system which experiences present active tectonic activity.
A habitable planet must keep its carbon dioxide from disappearing. Earth’s crust sink into the deeper layers where carbonate is decomposed to create CO2 again. The CO2 resurfaces through volcanic activity, replenishing the atmosphere.
The thickness of Earth’s two forms of crust is exactly balanced. If the crust were thicker, the rock would hold oxygen and fix it beneath the surface as oxides. If it were thinner, Earth would experience very frequent volcanic eruptions and the release of soot into the upper atmosphere would greatly hinder photosynthesis.
If all of these conditions are met, life flourishes. Explaining why out of 50 billion species on Earth, only 1 is develops high intelligence is a different story. I believe there is a reason for all of this here on Earth. |
Last edited by Hazael on Fri Nov 17, 2006 3:45 pm; edited 2 times in totalSome of the best scenarios on EE...
Up All Night Productions |
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| sickofpalantirs |
| Posted: Fri Nov 17, 2006 1:03 pm |
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Joined: 23 Mar 2006
Posts: 7750
Location: somwhere, over the rainbow way up high. There's a land that I heard of once in a lullaby.
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I don’t agree with all of that because I don’t believe in evolution.
I believe the earth is around 10,000 years old |
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| La_Sin_Grail |
| Posted: Fri Nov 17, 2006 9:38 pm |
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Joined: 14 Aug 2005
Posts: 806
Location: Maryland
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sickofpalantirs wrote: I don’t agree with all of that because I don’t believe in evolution.
I believe the earth is around 10,000 years old
You’ve got to be kidding me.
Um.... then explain dinosaurs? Or is it human bones that make fossil fuels? Explain carbon dating? I mean, if you want to say God created the earth however long ago, it’s all good, but I’m pretty sure there’s some SOLID proof the earth is billions of years old. |
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| Gate Troll |
| Posted: Fri Nov 17, 2006 10:45 pm |
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Joined: 15 Aug 2006
Posts: 384
Location: Udun Vale, Home of the one and only... Gate Troll!
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Carbon dating gives a wide range of ’Possible’ answers; If it comes
back from the lab and agrees with their theory then it is quoted as
"agreeing with carbon dating", If not it is never mentioned. |
| "Wars may be fought with weapons, but they are won by men. It is the spirit of the men who follow and of the man who leads that gains that victory."-George S. Patton. |
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| Pipeweed |
| Posted: Fri Nov 17, 2006 10:50 pm |
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Joined: 14 Jun 2006
Posts: 1010
Location: Earth (I think)
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| La_Sin_Grail |
| Posted: Fri Nov 17, 2006 11:04 pm |
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Joined: 14 Aug 2005
Posts: 806
Location: Maryland
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A flood causes fossil fuels? That’s a new one on me.
Explain fossil fuels OR fossils (I won’t even go into vestigial structures) And carbon dating isn’t precise, but it’s close. Close as in 400 million years isn’t 400. It could be 300 mil or 500 mil perhaps, but it’s going to be some sort of 9-digit number if they guess 300 million yrs. |
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| sickofpalantirs |
| Posted: Sat Nov 18, 2006 8:35 am |
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Joined: 23 Mar 2006
Posts: 7750
Location: somwhere, over the rainbow way up high. There's a land that I heard of once in a lullaby.
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La_Sin_Grail wrote: A flood causes fossil fuels? That’s a new one on me.
Explain fossil fuels OR fossils (I won’t even go into vestigial structures) And carbon dating isn’t precise, but it’s close. Close as in 400 million years isn’t 400. It could be 300 mil or 500 mil perhaps, but it’s going to be some sort of 9-digit number if they guess 300 million yrs.
A flood causes Death which causes some Bones which causes Fossil Fuel.
Time to summon BtO he has read books on both sides of the subject.
But yes as Pipeweed stated the flood could have caused the grand canyon to from in a year max.
O and you know about earths magnetic field that it is caused by electricity?
and the theory that explains how that electricity is in the core has been proven right on other planets while the other one failed miserable points to an earth that is 10,000 years or less old(just read that in my science curriculum yesterday).
Even Darwin had doubts about his theory remember that evolution is a theory it has not been made a law. |
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| La_Sin_Grail |
| Posted: Sat Nov 18, 2006 2:26 pm |
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Joined: 14 Aug 2005
Posts: 806
Location: Maryland
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sickofpalantirs wrote: La_Sin_Grail wrote: A flood causes fossil fuels? That’s a new one on me.
Explain fossil fuels OR fossils (I won’t even go into vestigial structures) And carbon dating isn’t precise, but it’s close. Close as in 400 million years isn’t 400. It could be 300 mil or 500 mil perhaps, but it’s going to be some sort of 9-digit number if they guess 300 million yrs.
A flood causes Death which causes some Bones which causes Fossil Fuel.
Time to summon BtO he has read books on both sides of the subject.
But yes as Pipeweed stated the flood could have caused the grand canyon to from in a year max.
O and you know about earths magnetic field that it is caused by electricity?
and the theory that explains how that electricity is in the core has been proven right on other planets while the other one failed miserable points to an earth that is 10,000 years or less old(just read that in my science curriculum yesterday).
Even Darwin had doubts about his theory remember that evolution is a theory it has not been made a law.
It takes more than a a few thousand years for fossil fuels to form, even from dead things.
Evolution is a theory, correct, but still, explain fossil fuels!! Also, my World Hist teacher had something interesting to say...
He has a theory (which this part is facutal) that the earth accumulates significant amounts of space dust every year. I forget the figure, but it was something in the ballpark of 100 million tons/year. Granted, spread over the whole earth, that’s not much, but he thought perhaps dinosaurs were already running into problems being big with the gravity of the earth increasing. At millions of tons per year, eventually it will add up. He said this is why life that remained from that area is mostly waterbourne, where gravity mattered less, and also that now life has to be smaller because something the size of a T-Rex would collapse under it’s own weight.
I’m not sure what you mean about the electrical core... why would that mean the earth is 10,000 yrs of less? Makes 0 sense.
One more thing. So you’re saying the dinosaurs were killed in the flood? Why didn’t the dinosaurs kill the people before the flood? |
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| CarpeGuitarrem |
| Posted: Sat Nov 18, 2006 6:53 pm |
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Joined: 07 Apr 2006
Posts: 3361
Location: Franciscan University of Steubenville
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So...about those aliens...  |
| "ok, change of plans. the Cobracards christmas party is coming to my house, and we’re gunna teach FM how to hunt." (mm) |
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| ingold55 |
| Posted: Sat Nov 18, 2006 7:42 pm |
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Joined: 10 Oct 2005
Posts: 1199
Location: Out on the front line
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| ok on the subject of carbon dating, did you know that they found a bone or something,1 around 100-200 years old. Carbon dating says the bone was 14,000,000 years old. just a bit inacurate! |
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