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Earth's Corner of the Galaxy Just Got a Little Lonelier
Hugh Pickens writes "Only four stars, including Barnard's Star, are within six light-years of the Sun, and only 11 are within 10 light-years. That's why Barnard's star, popularized in Robert Forward's hard-SF novel Flight of the Dragonfly, is often short-listed as a target for humanity's first interstellar probe. Astronomers have long hoped to find a habitable planet around it, an alien Earth that might someday bear the boot prints of a future Neil Armstrong, or the tire tracks of a souped-up 25th-century Curiosity rover. But now Ross Anderson reports that a group of researchers led by UC Berkeley's Jieun Choi have delivered the fatal blow to those hopes when they revealed the results of 248 precise Doppler measurements that were designed to examine the star for wobbles indicative of planets around it. The measurements, taken over a period of 25 years, led to a depressing conclusion: 'the habitable zone around Barnard's star appears to be devoid of roughly Earth-mass planets or larger ... [p]revious claims of planets around the star by van de Kamp are strongly refuted.' NASA's Kepler space telescope, which studies a group of distant Milky Way stars, has found more than 2,000 exoplanet candidates in just the past two years, leading many to suspect that our galaxy is home to billions of planets, a sizable portion of which could be habitable. 'This non-detection of nearly Earth-mass planets around Barnard's Star is surely unfortunate, as its distance of only 1.8 parsecs would render any Earth-size planets valuable targets for imaging and spectroscopy, as well as compelling destinations for robotic probes by the end of the century.'"
A lack of planet on a nearby star does not mean there is nothing around the star
There might still be fragments of ice / rocks / whatever that humankind can use to construct an artificial planet of some kind
Plus, the lack of existing planet means we get to create one, with our own design
Yea, make our own planet. Simple! This got modded 5 Insightful? Why not make another Earth in our own solar system? It would be way easier to do it here where all the resources are, instead of in a distant solar system. Or even easier, crash asteroids from the asteroid belt into Mars to create an Earth size planet. Why don't we do it? Because it would be freakin' impossible for any beings without near God-like technological powers.
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"Why don't we do it? Because it would be freakin' impossible for any beings without near God-like technological powers.
People not so long ago would have said that about many of the things we take for granted today. Try telling someone a couple of hundred years ago that we'd build aircraft that could carry hundreds of people at 2/3 the speed of sound to the other side of the planet in a few hours, or that we'd be able to pull a small device out of our pockets and talk instantly to someone anywhere on earth, or that we'd be able to send a sophisticated robot to Mars to explore and conduct science experiments. Creating an artificial planet isn't essentially that hard, it just requires a level of technology beyond where we're currently at. Get to a stage where you can send out self-replicating robots to collect and process asteroids for you, for example, and it might look a bit less daunting. And there's no particular reason to believe that we won't eventually develop such technologies.
Yea, make our own planet. Simple! This got modded 5 Insightful?
The Mormon Moderation Front?
Seriously, I can't think of anyone else who believe that humans will create planets. No, this is not flamebait or trolling - it really is the only ones I can think of that might see this as a possibility, although not while still human.
And if there really are someone delusional enough here to think that we could create our own planet while being mortal humans, you really need to think about the scale here. It's not just huge, it's immense. We only scratch the surface of this planet.
If we found Mount Everest sized rocks (~3x10^15 kg) in a solar system, we would need around 2 000 000 000, that is 2 milliard (or billion for those who use the short system) of them to create a planet with Earth's mass (~6x10^24 kg). Imagine the power and time needed to move one Mount Everest. Each Chomalungma sized rock is about 28 milliard (or billion in the short sytem) times the weight of the space shuttle.
And we're not just talking scale here. Think about how you would adjust the orbital speed of the mass you assemble so it would stay in orbit as you add to it. Or how to cool it down from all that kinetic energy -- how long did it take Earth to cool down? Or how to survive the flares of Barnard's Star?
Niven and Lucas make great space operas. But we have to admit to some limitations. Come back in a few million years, and whatever species have descended from us may have a different opinion. But us? No, we have no chance.
Why not make another Earth in our own solar system?
I'd prefer them to use Barnard's star for beta testing the process.
This is exactly what I came here to say.
One thousand years ago, the peak of technology was a powder that would explode when ignited, that could propel a small projectile in a general direction a few hundred feet. Today, the peak of technology is dropping a laser-armed nuclear-powered semi-autonomous wheeled laboratory from a rocket-powered flying crane onto a precise target from 150 million miles away.
By the time we have the capability to load up humans and send them 1.8 parsecs away before they (and any descendents) die, we might just have the technology to build an artificial planet, or at least a large structure capable of artificial gravity, a self-sustaining ecosystem, and harvesting materials from whatever asteroids are nearby. It does not need to be as big as the Earth or support as large a population, but it'll do for a while until technology improves further.
You do not have a moral or legal right to do absolutely anything you want.
This is actually pretty much true.
By the time we have the technology to smash together enough rocks that it can hold an atmosphere with its natural gravitational force, we won't need to live on a rock with enough natural gravitational force to hold an atmosphere.
That godlike amount of effort could be spent doing something more practical.