NASA Announces Space Launch System
Today NASA announced its next major space program called the Space Launch System. It's a evolution of the Constellation project that barely began before it was shut down, arguably for not being ambitious enough. Does SLS go farther, litterally and figuratively? Is that far enough?
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September 14, 2011, No comments
Turn this short 1080p video on full screen and watch as you're taken through a digital galaxy from the BBC's Stargazing Live.
This event is already sold out but the idea sounds fantastic: the planetarium at New York's Museum of Natural History is having an evening event with cocktails and a custom 200 player game in the planetarium.
There are quite a few public science exhibits getting on the cocktail hour train; the Bay Area hosts weekly events at both the Exploratorium and the Academy of Science. Hopefully the planetarium arcade game is a hit as well!
This picture of the Earth-based test duplicates for Sojourner, Spirit/Opportunity and Curiosity with two engineers really shows you the impressive difference in scale for each successive Mars rover. Will we continue to have increases in rover size or are we reaching the weight limitations of our Mars launch equipment?
The Technium: Undetectable Technology
A slightly different take on the Fermi Paradox from Karl Schroeder (retold by Kevin Kelly): we assume that all these advanced civilizations would bleed the same amount and type of electromagnetic radiation that we currently do. But being sufficiently advanced and having finite resources, who's to say their efficiency hasn't advanced to the point of infinitesimal loss due to inefficiency? This would push the civilization back to the point of being not as obviously identifiable as we are at many light years distance.
Considering the age of our civilization and our current rate of change, it doesn't seem all that unlikely that we could be out of phase with a particular communication method or power source available to a civilization with a ten, a hundred or a thousand millennia head start on us. Good food for thought.
From BoingBoing, a fascinating video on the chemical components that are used to make a glow stick. It's better than your average mixing chemicals video (of which there are a surprising number on youtube) because the video's chemist explains a key point in understanding the reasons that the reaction works. Two different reactions are taking place; one which generates energy (but no light by itself) and the other which turns that energy into the visible fluorescent light you see from a glow stick.
Origins of Mass: Mostly Energy
When one gets deep into a discussion of "what is stuff made of?" with a non-scientist most people[1] can roughly describe the inside of an atom as protons, neutrons and electrons. A few can describe the inner workings of nucleons in terms of quarks but beyond that there is very little popular explanation for how things work on the quark level.
Fermilab's daily publication has a great explanation that goes a little deeper into the making of nucleons in the context of where the mass of an atom comes from (hint: it's mostly not the Higgs).
1 people in this case are those who would be interested in explaining the inside of stuff to other people.
Beautiful Gemini Mission Photos
Wired Science has a selection of high quality Gemini photographs from the ten missions in '65 and '66 curated from a larger collection just brought online through Arizona State University.
Most of the images in the archive are downright boring due to the experimental nature of the flights themselves - everything was being captured for later analysis. The more interesting photos are of the Gemini capsules nearing each other during VI-A and VII in a rendezvous maneuver which brought both manned capsules within a few feet of one another. If you appreciate photos of the Shuttle approaching the ISS and the like, you'll appreciate these.
Stratolaunch has Plane Rockets
According to Stratolaunch, carrying rockets underneath planes and launching them from x-thousand feet saves on rocket launch costs and improves safety. It's another interesting idea that involves Paul Allen and Burt Rutan - Rutan apparently committing to make the plane side of things (it does look very similar to White Knight, the launcher for Rutan's Space Ship One) while the rockets will come from Elon Musk's SpaceX Falcon line.
Very little technical detail included but the project is apparently breaking ground at a Mojave manufacturing facility this year. Good luck to them!
As the Large Hadron Collider ramps up for the first 7 TeV collisions today, quite a number of articles are floating around and taking advantage of the increased attention.
First, Wired is keeping a close eye on the LHC with an interview and excerpt from Paul Halpern and his book Collider which came out last August. The excerpt is a little dated but the interview has some good insights into the Texas-located almost-predecessor of the LHC, the Superconducting SuperCollider.
If you're looking for news from the beast itself you can check out CERNs press release for the newly minted energy level. In total, the LHC spent more than three hours colliding beams today and gathering data. All those collisions produced about half a million events that will be sifted for interesting data in the near future.
And, in a more local vein, Lawrence Berkeley Lab has their own article about LBL physicists doing work at the LHC.
As for the collisions themselves, journalists seem to prefer the data-getting rather than the conclusion-finding, perhaps because it's easier to understand "turning on" or "higher energies" than "subtle suggestions of W-decay top production."
Recently Bloom Energy has been getting a lot of attention for their fuel cell technology they officially launched Wednesday morning and the whole pitch seems very magical at first glance. With a little digging and an understanding of what to look for, I think we can find out just how magical this technology is and what the potential pitfalls are.
Fuel cell technology isn't new by any means. It was originally discovered in the 1830s (yes, the 1830s) though the modern fuel cell is a little more recent (like the 1950s) but limitations have forced it into a niche as essentially a toy for scientists to play with beyond a couple ultra-specialized applications like the Gemini and Apollo programs.
Scientists and engineers love fuel cells because they can have decent efficiencies, generally above 50%. The internal combustion engine, for reference, sits around 15% efficient. The reason they're so limited in use is that their components can be very expensive. Rare and valuable materials, such as platinum and palladium, are used in the production of certain types of fuel cells and this drives up the cost of producing the cell in the first place.
Typically you hear about fuel cells as a powerplant for cars and they generally run on hydrogen because pressurized hydrogen is portable (though heavy - the containers at least). These fuel cells all work the same way; take in hydrogen in one end, insert gaseous oxygen in another end and with the right mixture of cathode, anode and electrolytic materials, you can produce power and emit only water.
Bloom's fuel cell is a particular type of cell called a solid oxide fuel cell (SOFC) which isn't a new technology in itself and is useful for its lack of expensive materials used in production. Not only does the solid oxide process require heat but it produces huge amounts of heat (upwards of 1000??C), sustaining its own fuel cycle. In all the mystery surrounding the Bloom fuel cell, perhaps the greatest space for innovation is either a SOFC that operates at a lower maximum temperature or materials that better withstand the high temperatures.
The biggest source of mystery in Bloom's product is the green and black "ink" (yes, even they use the "quotes") that form the cathode and anode of the fuel cell. If Bloom has really invented a cheap way to manufacture the cathode and anode portions of the fuel cell, they only have one more hurdle to clear - lifetimes. Bloom doesn't mention the lifetime for their product very prominently but apparently it's around 10 years. That's primarily for the enclosure equipment as I've heard that the fuel cells themselves have to be replaced twice during the lifetime of the product. That's about a three year lifespan for the cells, a pretty decent span of time but also not without waste. Presumably the price of the replacement cells and labor to switch them out is built into the $700-$800k that you would pay for a commercial box.
Between interviews and press coverage, a lot of things have been mentioned about Bloom, the most misleading, I think, are the idea that it can "run on solar" and that it produces "no emissions". "No emissions" could be one of two scenarios, the first being a "run on solar" option as well. Since this type of solid oxide fuel cell can be run on hydrogen alone, a potential configuration is a solar array producing energy that is directly used to electrolyze hydrogen. The hydrogen is then pumped through the fuel cell and produces electricity with oxygen through the process mentioned earlier. The only emission in this case is water. The second is probably more likely with natural or biogas being pumped through the cell. The gas isn't used in the same way that combustion uses it so there aren't any "emissions" so to speak, but there is still used gas to dispose of or refine so it can be used again.
Considering that solar panels aren't generally enough to power an entire house, could they really be enough to generate enough hydrogen to power a house via fuel cells? Probably not. More conversion means more losses to the inefficiencies of systems and going from sunlight to electricity to hydrogen to the fuel cell and back to electricity doesn't seem like it's going to be more efficient than solar alone. Can it potentially use hydrogen as a natural energy storage container, reducing or removing the need for expensive batteries? It's definitely possible, but if hydrogen via solar was all that efficient to begin with, we'd probably be producing more of it already.
It sounds like Bloom is a little more realistic now but there are a lot of mysteries still in play. The cost of manufacturing could be much larger than suggested, Bloom could be burning through their hundreds of millions of dollars in startup funding because the boxes are more expensive to produce then they sell them for. Keep in mind the fuel cell replacement costs twice over ten years. Maybe the cost of developing the inks used in the fuel cell releases lots of carbon dioxide despite the fact that the box itself could produce "no emissions". Or perhaps the fuel cells can't be adequately recycled afterwards and they just build up in some landfill somewhere.
We really won't know the implications until the technology has been on the market for longer and more details about the inks are released. No doubt, this will all come with time as more and more people sign up to get Bloom boxes installed in their backyards.