Skip to comments.Earth's days are numbered
Posted on 09/20/2013 1:45:59 AM PDT by LibWhacker
Earth will be able to host life for just another 1.75 billion years or so, according to a study published on 18 September in Astrobiology1. The method used to make the calculation can also identify planets outside the Solar System with long habitable periods, which might be the best places to look for life.
The habitable zone around a star is the area in which an orbiting planet can support liquid water, the perfect solvent for the chemical reactions at the heart of life. Too far from a star and a planets water turns to permanent ice and its carbon dioxide condenses; too close, and the heat turns water into vapour that escapes into space.
Habitable zones are not static. The luminosity of a typical star increases as its composition and chemical reactions evolve over billions of years, pushing the habitable zone outward. Researchers reported in March that Earth is closer to the inner edge of the Suns habitable zone than previously thought2.
(Excerpt) Read more at nature.com ...
Bottom line? We need to eventually leave this planet, period. There’s no if’s about this.
The positive is that we’ve got a couple thousand years as a minimum to get smart, explore, and find other places.
For those big into big fancy buildings or statues for the future....you might as well prepare for the day that it won’t really matter anymore.
Humans leaving the planet could be extremely difficult. Far easier to move the Earth out a ways to keep it in the habitable zone.
I’m sure Obongo has a solution, if you just raise the debt ceiling...
Must be Bush’s fault.
So Earth is like 55 in human years?
For one thing all our lives are in the hands of the lord. And to worry about something 1.5 billion years down the road pretty silly...
...don’t allow yourselves to be agitated into a call for action so we can pay a transportation tax to another democratic party trash, fear mongering grifter.
No, the Earth will be around long after it is no longer habitable by humans or by macro lifeforms. The Earth may migrate outwards in the Solar System as the Sun’s mass decreases as the result of radiation of the energy produced by its nuclear fusion and mass ejections. It becomes a matter of which expands outwards into the outer Solar System faster, the Earth’s orbit or the Sun’s expanding diameter. In either case, the Earth’s atmosphere, hydrosphere, and upper lithosphere will have long before become vaporised and stripped away from the Earth into the outer reaches of the Solar System. Human life, however, will have long ago become extinct upon the Earth due to an assortment of earlier extinction level events.
The movement of the Earth to a more distant orbit from the Sun by natural or artificial means will not alter this outcome. The only hope for human survival is for the community to migrate its surviving societies to asteroidal and space habitats in the outer Solar system, interstellar dark planetery systems, and other stellar systems.
The much-heralded Information Age is full of itself.
Well, that’s an eye-opener :)
The meek shall inherit the earth. The rest of us are going to the stars.
— Robert A. Heinlein
Carbon is being converted to non-usable forms at a steady rate such that the level of atmospheric carbon is orders of magnitude lower than in the past. Life will go extinct long before the earth becomes otherwise uninhabitable because of the lack of carbon.
We can thank anthropogenic warming enthusiasts for their schemes to sequester even more carbon to keep it out of the atmosphere, thereby hastening the end of life on earth. Who knows, maybe they *want* the destruction of all life.
So, does this mean I have time to enjoy a few good steaks?
I guess I better cancel our trip next weekend to our trailer, eh?
“The inner edge of the Suns habitable zone is moving outwards at a rate of about 1 metre per year.”
So that means that at some point part the Earth could be in the habitable zone but a tiny portion of it could be too close to the Sun so you could survive the night but not the following day? Yeah, right, got it. One meter one way or the other makes all the difference, yep.
Yep, we’re all going to die UNLESS we pay more taxes to these political ‘experts’ who will ‘fix’ this! -making our lives crummier and theirs more cushy.
The eventual cooling of the earth’s interior will cost us our magnetic field and our continents as they erode below sea level.
Our moon is also drifting away which causes other problems.
Not sure what the energy requirements would be to boost the Earth to a higher orbit around the Sun, but they must be gargantuan. Maybe we could launch a giant "sunshade" to partly block the sun. Make it a solar collector and beam back the energy to Earth as a bonus. (I know, I'm dreaming. The reality is we don't even have an available means to launch a manned vehicle at the moment. Sad, really.)
That does it. I’m shorting Terran real estate.
It'll be here before you know it.
I say in the next thousand years we start building giant spacecraft in orbit, a fleet of them, for the day when we have to the leave to plunder other solar systems of their resources.
We are V.
The day is coming that a giant 8-ball will crash to Earth.
It’s high time I started smoking better cigars.
Back in the Cold War days there was a story that "Red China" was developing a Doomsday weapon: The communist government would equip every Chinese citizen with a six foot stump in their yard. At a signal from Chairman Mao everyone would mount their stump and jump off, knocking the Earth out of its orbit.
We were always V.
Entire cultures of “Puritans”, “wacko environmentalists”, “intelligentsia-dopes” and “Texans” will pack and leave to resettle and start bold new planets in their culture theme. A thousand years from now...the planet Texas will be waiting for folks to arrive.
...and I feel fine.
That will be where I belong. Assuming my artificial body and consciousness transfer continues to work smoothly about 200 more times.
We are the fat blobs in Wall-E.
pretty close right now
The Moon’s orbit increases as angular momentum is transferred from the Earth to the Moon until they become tidally locked with a period of perhaps 40 days for the Earth’s diurnal rotation and the Moon’s orbital period. Then the Sun’s angular momentum is transferred to the Moon, and the Moon’s orbit decreases until reaching the Roche limit close to the Earth. The Moon then breaksup, rains asteroidal destruction upon the surface of the Earth (already dead and barren), and the Earth acquires a ring of Moon debris in orbit around the Earth like the rings of Saturn.
The only problem with your theory is that we know and can prove that the moon is drifting further away from the earth.
but then it comes back and slaps us in the face!
Whether we're talking 100,000, 1 million, or 1 billion years, that's a long damn time.
Haven't we done enough damage here?
Maybe it's the way of things that when a species develops the technology to colonize other solar systems those same technologies will cause it to self destruct.
Its just backing off to get a running start.
Theres no point acting all surprised about it. All the planning charts and demolition orders have been on display in your local planning department in Alpha Centauri for fifty of your Earth years, so youve had plenty of time to lodge any formal complaint and its far too late to start making a fuss about it now.
Humanit may very well not have a thousand years remaining in which to establish an extraterrestrial home to survive the extinction of Humanity on the Earth. One or two asteroid strikes may have already nearly caused the extinction of Humans not so long ago in the Paleolithic and much earlier. The Earth is due for a much larger ELE (Extinction Level Event) of the type which results in the sudden extinction of most life on the Earth. Either way, a lesser ELE or a greater ELE, Human technical civilization will be destroyed and become incapable of arising again. The current civilization has already extracted much of the more easily recoverable non-renewable natural resources of the Earth. A future civilizaton arising anew will not have access to the quantities of resources required to sustain a civilization of our current size or greater required to support extraterrestrial activities. in other words, once lost, human extraterrestrial capabilities will be unlikey to be regained in the future. The time to establish permanent extraterrestrial habitats and civillization iis now or never.
the clock is ticking, and it a race to see whether or not Humans will permanently colonize survivable cextraterrestrial communities or perish in the not to distant future at the next ELE as near as the next good sized asteroid to impact the Earth or the next supernova to burst in the local neighborhood of stars within 100 light years.
I’ll go, I have nothing better to do and I can finish my novel on the trip too
“The only problem with your theory is that we know and can prove that the moon is drifting further away from the earth.”
Evidently, you failed to read and/or understand that I wrote saying the Moon’s orbit is expanding to send the Moon farther away from the Earth. But this expansioin is destined to come to a halt when the Earth’s diurnal rotation and the Moon’s orbital period become synchronized, at what some have reported as about a 40 day period. At that point an observer of the Earth’s surface could see the Moon from only one hemisphere. This assumes the eccintricity of the Earth’s axial tilt has not already destabilized as expected and becom a 90 degree tilt.
Once the Earth and Moon have become tidally locked, the Moon’s outward drift becomes reversed with the moon losing angular momentum to the Sun and its orbit drifts downwards towards the Earth. When the drift downwards brings the Moon very close to the Earth and reaches the Roche limit for the Moon, the Moon disintegrates and rains further destruction upon the Earth.
Its better than the clown who told me that the sun is fueled by comets and dust falling into it like a great big bonfire.
That reminds me of the news article that said such and such comet is to be a spectacular site if the sun doesn’t burn it up first. (Without the sun the comet wouldn’t have a tail or be lit up, lol)
It’s a case of use it before you lose it anyway.
Ceres is the largest known asteroid in the Solar System at present with a diameter of something like 400 miles. Mining its interior to produce a habitat would produce arable alnd nearly equivalent to all of the currently arable land on the entire Earth. This is because very little of the Earth’s surface is arable land. The low gravity conditions of the Asteroid would permit the construction of large interior spaces which provides so much overhead space, an inhabitant would perceive the overhead to be a blue sky much like that of Earth. Only a few thousand feet of overhead space is required for this effect. Such a colony could support human populations numbering in the tens of millions or more.
there is enough water ice in the outer regions of the Solar system to supply enough water to fill multiple Earth oceans. This water is also the source of wcarbon dioxide for plants and oxygen for animals. The asteroids are a readily available for high grade metal ores in quantities many times greater than all of the metal ores mined by man in all of history. Artificial gravity can be produced by spinning the habitat. Nuclear energy is readily available with little need for concern about radioactive contamination. Disposal of radioactive contaminants are safely accomplished through the simple expedient of deorbiting the material into the Sun.
It's humbling. What's to say that our being here is not the result of an endeavor like that?
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.