lifeboat – Lifeboat News: The Blog

Photonic propulsion cuts Mars travel time

Philip Raymond — Thu, 25 Feb 2016 20:23:49 +0000

Recent advances in lasers suggest that we may see rockets propelled by light earlier than we had imagined. NASA scientist Philip Lubin and his team are working on a system that would use Earth-based lasers to allow space travel to far-away places in just a fraction of the time needed with current technology.

Using earth based lasers to push along a spacecraft instead of on board hydrocarbon-based fuel could dramatically reduce travel time to Mars, within our lifetime. Currently, it takes five months for a space craft to reach Mars. But, with photonic propulsion, it is likely that small crafts filled with experiments will reach Mars in just 3 days. Large spaceships with astronauts and life support systems will take only one month, which is about 20% of the duration of a current trip.

What’s next? Lubin believes that we may be able to send small crafts with scientific experiments to exoplanets as fast as 5% light speed in, perhaps, 30 years. Eventually, he claims that the technology will carry humans at speeds up to 20% light speed.

Read about it here.

Gravity Modification – What Is The Record?

Benjamin T. Solomon — Sun, 06 Jan 2013 04:53:35 +0000

If, we as a community, are intending to accelerate the development of interstellar travel we have to glower at the record and ask ourselves some tough questions. First, what is the current record of the primary players? Second, why is everyone afraid to try something outside the status quo theories?

At the present time the primary players are associated with the DARPA funded 100-Year Starship Study, as Icarus Interstellar who is cross linked with The Tau Zero Foundation and Centauri Dreams is a team member of the 100YSS. I was surprised to find Jean-Luc Cambier on Tau Zero.

Gary Church recently put the final nail in the Icarus Interstellar‘s dreams to build a rocket ship for interstellar travel. In his post on Lifeboat, Cosmic Ray Gorilla Gary Church says “it is likely such a shield will massive over a thousand tons”. Was he suggesting that the new cost of an interstellar rocket ship is not 3.4x World GDP but 34x or 340x World GDP? Oops!

Let us look at the record. Richard Obousy of Icarus Interstellar and Eric Davis of Institute for Advanced Studies claimed that it was possible, using string theories to travel at not just c, the velocity of light but at 1E32c, or c multiplied by a 1 followed by 32 zeros. However, Lorentz-FitzGerald transformations show that anything with mass cannot travel faster than the velocity of light. Note that Lorentz-FitzGerald is an empirical observation which was incorporated into Einstein’s Special Theory of Relativity.

It is quite clear that you can use string theories to say anything you want. I used the term ‘mathematical conjecture’.

In April 2008 the esteemed Michio Kaku said in his Space Show interview, that it would take several hundred years to do gravity modification. But Michio Kaku is a string theorist himself. And I might add down to Earth one at that, since his opinion contradicts Richard Obousy and Eric Davis.

Then there is George Hathaway also with the Tau Zero Foundation who could not reproduce Podkletnov’s experiments, even when he was in communication with Podkletnov.

And this is the one group our astronaut Mae Jemison, leader of the 100YSS effort, has teamed up with? My sincerest condolences to you Mae Jemison. Sincerest condolences.

For the answer to the second question, you have to look within yourselves.

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Benjamin T Solomon is the author & principal investigator of the 12-year study into the theoretical & technological feasibility of gravitation modification, titled An Introduction to Gravity Modification, to achieve interstellar travel in our lifetimes. For more information visit iSETI LLC, Interstellar Space Exploration Technology Initiative.

Solomon is inviting all serious participants to his LinkedIn Group Interstellar Travel & Gravity Modification.

On Leaving the Earth. Like, Forever. Bye-Bye.

Reno J. Tibke — Wed, 26 Sep 2012 08:18:01 +0000

Technology is as Human Does
When one of the U.S. Air Force’s top future strategy guys starts dorking out on how we’ve gotta at least begin considering what to do when a progressively decaying yet apocalyptically belligerent sun begins BBQing the earth, attention is payed. See, none of the proposed solutions involve marinade or species-level acquiescence, they involve practical discussion on the necessity for super awesome technology on par with a Kardeshev Type II civilization (one that’s harnessed the energy of an entire solar system).

Because Not if, but WHEN the Earth Dies, What’s Next for Us?
Head over to Kurzweil AI and have a read of Lt. Col. Peter Garretson’s guest piece. There’s perpetuation of the species stuff, singularity stuff, transhumanism stuff, space stuff, Mind Children stuff, and plenty else to occupy those of us with borderline pathological tech obsessions.

[BILLION YEAR PLAN — KURZWEIL AI]
[U.S. AIR FORCE BLUE HORIZONS FUTURE STUFF PROJECT]

Ark-starship – too early or too late?

Alexei Turchin — Wed, 30 Dec 2009 18:34:48 +0000

It is interesting to note that the technical possibility to send interstellar Ark appeared in 1960th, and is based on the concept of “Blust-ship” of Ulam. This blast-ship uses the energy of nuclear explosions to move forward. Detailed calculations were carried out under the project “Orion”. http://en.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion) In 1968 Dyson published an article “Interstellar Transport”, which shows the upper and lower bounds of the projects. In conservative (ie not imply any technical achievements) valuation it would cost 1 U.S. GDP (600 billion U.S. dollars at the time of writing) to launch the spaceship with mass of 40 million tonnes (of which 5 million tons of payload), and its time of flight to Alpha Centauri would be 1200 years. In a more advanced version the price is 0.1 U.S. GDP, the flight time is 120 years and starting weight 150 000 tons (of which 50 000 tons of payload). In principle, using a two-tier scheme, more advanced thermonuclear bombs and reflectors the flying time to the nearest star can reduce to 40 years.
Of course, the crew of the spaceship is doomed to extinction if they do not find a habitable and fit for human planet in the nearest star system. Another option is that it will colonize uninhabited planet. In 1980, R. Freitas proposed a lunar exploration using self-replicating factory, the original weight of 100 tons, but to control that requires artificial intelligence. “Advanced Automation for Space Missions” http://www.islandone.org/MMSG/aasm/ Artificial intelligence yet not exist, but the management of such a factory could be implemented by people. The main question is how much technology and equipment should be enough to throw at the moonlike uninhabited planet, so that people could build on it completely self-sustaining and growing civilization. It is about creating something like inhabited von Neumann probe. Modern self-sustaining state includes at least a few million people (like Israel), with hundreds of tons of equipment on each person, mainly in the form of houses, roads. Weight of machines is much smaller. This gives us the upper boundary of the able to replicate human colony in the 1 billion tons. The lower estimate is that there would be about 100 people, each of which accounts for approximately 100 tons (mainly food and shelter), ie 10 000 tons of mass. A realistic assessment should be somewhere in between, and probably in the tens of millions of tons. All this under the assumption that no miraculous nanotechnology is not yet open.
The advantage of a spaceship as Ark is that it is non-specific reaction to a host of different threats with indeterminate probabilities. If you have some specific threat (the asteroid, the epidemic), then there is better to spend money on its removal.
Thus, if such a decision in the 1960th years were taken, now such a ship could be on the road.
But if we ignore the technical side of the issue, there are several trade-offs on strategies for creating such a spaceship.
1. The sooner such a project is started, the lesser technically advanced it would be, the lesser would be its chances of success and higher would be cost. But if it will be initiated later, the greater would be chances that it will not be complete until global catastrophe.
2. The later the project starts, the greater are the chance that it will take “diseases” of mother civilization with it (e.g. ability to create dangerous viruses ).
3. The project to create a spaceship could lead to the development of technologies that threaten civilization itself. Blast-ship used as fuel hundreds of thousands of hydrogen bombs. Therefore, it can either be used as a weapon, or other party may be afraid of it and respond. In addition, the spaceship can turn around and hit the Earth, as star-hammer — or there maybe fear of it. During construction of the spaceship could happen man-made accidents with enormous consequences, equal as maximum to detonation of all bombs on board. If the project is implementing by one of the countries in time of war, other countries could try to shoot down the spaceship when it launched.
4. The spaceship is a means of protection against Doomsday machine as strategic response in Khan style. Therefore, the creators of such a Doomsday machine can perceive the Ark as a threat to their power.
5. Should we implement a more expensive project, or a few cheaper projects?
6. Is it sufficient to limit the colonization to the Moon, Mars, Jupiter’s moons or objects in the Kuiper belt? At least it can be fallback position at which you can check the technology of autonomous colonies.
7. The sooner the spaceship starts, the less we know about exoplanets. How far and how fast the Ark should fly in order to be in relative safety?
8. Could the spaceship hide itself so that the Earth did not know where it is, and should it do that? Should the spaceship communicate with Earth? Or there is a risk of attack of a hostile AI in this case?
9. Would not the creation of such projects exacerbate the arms race or lead to premature depletion of resources and other undesirable outcomes? Creating of pure hydrogen bombs would simplify the creation of such a spaceship, or at least reduce its costs. But at the same time it would increase global risks, because nuclear non-proliferation will suffer complete failure.
10. Will the Earth in the future compete with its independent colonies or will this lead to Star Wars?
11. If the ship goes off slowly enough, is it possible to destroy it from Earth, by self-propelling missile or with radiation beam?
12. Is this mission a real chance for survival of the mankind? Flown away are likely to be killed, because the chance of success of the mission is no more than 10 per cent. Remaining on the Earth may start to behave more risky, in logic: “Well, if we have protection against global risks, now we can start risky experiments.” As a result of the project total probability of survival decreases.
13. What are the chances that its computer network of the Ark will download the virus, if it will communicate with Earth? And if not, it will reduce the chances of success. It is possible competition for nearby stars, and faster machines would win it. Eventually there are not many nearby stars at distance of about 5 light years — Alpha Centauri, the Barnard star, and the competition can begin for them. It is also possible the existence of dark lonely planets or large asteroids without host-stars. Their density in the surrounding space should be 10 times greater than the density of stars, but to find them is extremely difficult. Also if nearest stars have not any planets or moons it would be a problem. Some stars, including Barnard, are inclined to extreme stellar flares, which could kill the expedition.
14. The spaceship will not protect people from hostile AI that finds a way to catch up. Also in case of war starships may be prestigious, and easily vulnerable targets — unmanned rocket will always be faster than a spaceship. If arks are sent to several nearby stars, it does not ensure their secrecy, as the destination will be known in advance. Phase transition of the vacuum, the explosion of the Sun or Jupiter or other extreme event can also destroy the spaceship. See e.g. A.Bolonkin “Artificial Explosion of Sun. AB-Criterion for Solar Detonation” http://www.scribd.com/doc/24541542/Artificial-Explosion-of-S…Detonation
15. However, the spaceship is too expensive protection from many other risks that do not require such far removal. People could hide from almost any pandemic in the well-isolated islands in the ocean. People can hide on the Moon from gray goo, collision with asteroid, supervolcano, irreversible global warming. The ark-spaceship will carry with it problems of genetic degradation, propensity for violence and self-destruction, as well as problems associated with limited human outlook and cognitive biases. Spaceship would only burden the problem of resource depletion, as well as of wars and of the arms race. Thus, the set of global risks from which the spaceship is the best protection, is quite narrow.
16. And most importantly: does it make sense now to begin this project? Anyway, there is no time to finish it before become real new risks and new ways to create spaceships using nanotech.
Of course it easy to envision nano and AI based Ark – it would be small as grain of sand, carry only one human egg or even DNA information, and could self-replicate. The main problem with it is that it could be created only ARTER the most dangerous period of human existence, which is the period just before Singularity.