As we pointed out, yes, beaming “clean” energy to Earth still produces waste heat. So we want to spend as much of that energy as possible out there–in space. Amazingly, this is more than science fiction–NASA is doing it. Yes, despite all the sequester-hungry Congress, NASA has contracted with Tethers Unlimited to build large parts of spacecraft in space. Solarrays, solar sails, pieces of unprecedented size.
How will this be done?
By 3D printing, also known as “additive manufacturing” because you build up the structure layer upon layer. NASA just announced the first 3D printer at the International Space Station. It printed a part to repair itself–prudent thinking. But the same technology–unlimited by gravity–can print out anything anywhere, of any size.
To power up such factories, the solarray is the obvious solution. The only question is, what source of atoms? Moon and asteroids?
This gets back to our moonbase idea, but serious engineers are proposing to build whole space ships out there.
This past week saw an advance in our long journey toward energy from space. As I have argued, and depict in my Frontera series, energy from space is our only hope for long-term protection of our home planet.
The idea of beaming energy from solar collectors was just that–an idea–back in the twentieth century. But Japanese industry takes it seriously. Mitubishi just reported a significant advance in technology. They managed to transmit 10 kilowatts via microwave across 500 meters. That may not sound like much, compared to the 36,000 km distance that will be required from a geostationary satellite. But it’s an important step forward.
Why is space energy so important? Because all energy use generates waste heat–more and more of it, as more of us do more stuff. And fundamental physical laws limit the rate at which our planet can get rid of waste heat.
Even before the theoretical limits kick in, we can see how upscaling any Earth-based power supply eventually brings disaster.
Solar. Solar power works great on a local scale–every home should have a few solar panels. But scale it up to power cities? Cover the Mohave desert? Black absorptive panels replace white reflective sand. It turns out that large-scale solar may cause half as much global warming as burning carbon fuels. So the planet cooks a bit more slowly. Not a solution.
Geothermal. Geothermal works great to heat your home–even in rural Ohio. We all should go out tomorrow and install geothermal. (After my papers to grade.) But on large scale? Remember when Germany and Switzerland were putting in giant geothermal bore holes. They caused earthquakes.
Wind. Wind is a promising solution for many local areas, from New England to Antarctica. Get used to the turbines–they look as decent as telephone poles. But larger scale wind farms will actually disrupt atmospheric currents, with unknown effects on climate.
Nuclear. Yes it’s clean now, and it’s cost effective–so long as you ignore the next 10,000 years of waste site containment. If today’s ISIL bulldozed the 3,000 year-old Nimrud, what will future crazed groups do?
“Clean” coal, oil, natural gas, fracking. Anything with C in it ends up as CO2. And half of fracked gas escapes, methane, an even more potent greenhouse gas.
Energy in space is where we’ll have to go. And more–we’ll have to spend it there, too, putting all the heat-generating factories there to build our “stuff” and ship it down the gravity well. So let’s get started now.
Looking forward to seeing some of you at ICFA in Orlando.
It’s been a while since Ultraphyte blogged on biological sex. Since Brain Plague in 2000, I’ve felt there was little more to be said on the postgender world. However, trust the cell biologists to reveal twists even more bizarre than science fiction.
For perspective: Back in the sixties, we were taught that people came in two sexes and four crayon colors (brown, red, yellow, white). Now we know that sexes, like colors, are a spectrum, like infrared through visible and UV. Some examples, in this open-access Nature review:
- People are mosaic–perhaps 1% of us. Mosaic means we have large chunks of cells with a chromosome count different from other chunks of cells. So, maybe, your womb is female (XX) but your legs are male (XY). Or your testes are male (fathering children), then your surgeon “discovers” a womb tucked behind.
How can this happen? Several ways, each more bizarre than the last:
- Cell divisions in the early embryo make a mistake called “non-disjunction”; that is, at mitosis, chromosomes replicate but both copies go over to one daughter. So, for instance, YX –> YY XX –> daughter cells Y and YXX instead of YX, YX. The Y cell dies; but the YXX can recover by spitting out the Y, leaving XX. Now, a part of the body continues developing YX (the original cell line) whereas the others go XX.
- A pair of fraternal twins (XY and XX) start out on their own, but then stick together and “merge” into one body. Now you genetically consist of two different people, with two different chromosome sets.
- Your autosomes (all the chromosomes other than X or Y) carry other sex-regulating genes–dozens of them. Any one of them can go missing at cell division, leaving you with some other kind of mosaic, say a male body that “ignores” the screaming male hormone. You end up a super beautiful female (outside) without functional reproductive organs.
It gets weirder. When you’re pregnant, what becomes of all those fetal cells that wind up in your own blood stream–enough for a blood test that precisely details your child’s sex and any genetic defects? Virtually 100% of mothers are mosaic with their children’s cells.
Some of those fetal cells wind up part of your tissue, even entering your brain and hooking up with your own neurons. So, decades later, you still have your child’s cells forming part of your brain. Your child, too, has some of the mother’s cells. So, a mother and a male child each share part of each other, including each other’s gender.
Where this all leads, we don’t yet know, but here’s a valentine for someone who knows why.
You will recall from our Antarctic Upside Down Lakes that we came across some amazing alien life forms emerging out of five meters of ice, from another fifteen meters or more in the lake below. Our expedition was led by Rachael Morgan-Kiss, at Miami U-Ohio, sponsored by NSF–her research blog is here.
These life forms are cyanobacterial mats–dessicated cyanobacteria (photosynthetic microbes) entwined with algae, protists, even possibly tiny invertebrates like water bears. At a touch, they fall apart and blow off in the wind, to find a melting hole in the lake, or in another lake downwind. Well, some of this one didn’t blow away–it ended up stuffed into the purple capped tube, and shipped at -20C to our home continent.
Here’s what one of the samples looked like, arriving back at Kenyon. Still a bit of green.
Is anything alive in there? To find out, we put samples into BG-11 cyanobacterial growth medium, a mixture of plain salts such as carbonate, nitrate, and phosphate–essential atoms, little more, since cyanobacteria build just about everything from scratch. Professor Chris Bickford kindly loaned his lighted incubator, which went down to 10C (50F). That’s not especially cold, but it’s the coldest our incubator will go. And actually, this temperature is reached within the depth of some of the Dry Valley lakes, as well as in sun-heated pools of meltwater during the Antarctic summer.
The samples from Lake Fryxell we put into 100-ml graduated cylinders, to give them both a surface for green algae and a depth for growth of the orange-brown ones.
After two weeks–It’s alive! Green stuff bubbling oxygen. Remember–that’s where all the oxygen you breathe comes from.
After two weeks, you can see the glacier-melt brown stuff’s grown too, expanded and bubbling, while yellow stuff multiplies throughout the flask. We think the yellow stuff includes heterotrophs (organic food eaters) that suck up the oxygen, which is toxic to the photosynthesizers.
Meanwhile, what to call all this stuff? Today, it’s all in the DNA. So we took some of the original samples to smash them up for their DNA.
Here are samples of Fryxell mat (colored) and glacier mat (dark) ready for the PowerBiofilm bead beater: Tubes of sharp glass beads to shake in the vortexer.
So what’s in the DNA? Stay tuned, and let’s find out.
This week, geologist Nora Noffke reports a study of Curiosity rover images that resemble Earth’s life forms. Noffke has long experience of interpreting fossils of ancient Earth in three billion-year-old rock formations such as Pilbara, Australia. In other words, writing grants persuading us to fund one’s camping in of Earth’s most scenic places.
The diagram above shows just one of her many images, with interpretation (the scale bar is 15 cm). It certainly looks like a modern microbial mat upon lake sediment, peeled back and rolled over in some places. Only organic life forms produce such flexible sheets of material, in layers associated with water (whose existence on Mars has also gained evidence). Surprisingly, perhaps, we have no statistical test to say, “that’s a microbial mat.” But the quality and quantity of the images may be our most compelling yet found.
Perhaps Noffke’s most convincing argument is that, were these rocks terrestrial, they would undoubtedly be accepted as fossils of ancient life. To be consistent: Either life existed on Mars three billion years ago–or it failed to exist on Earth.
Why is it so hard to find life on Mars? Microbial life can be incredibly subtle. I came to realize this during my explorations of Antarctica–arguably the best modern model for life without macrobiota.
The Antarctic Dry Valleys are a landscape in which all life is microscopic–that is, microbial or tiny invertebrates requiring magnification to see. There is no soil–because “soil” is a product of living bodies, plant detritus chopped by arthropods and processed by worms, feces of larger life. No soil, only sand and pebbles.
But here and there–where there is water–the microbes congregate in forms called mats or biofilms. Seeing these biofilms can be tricky.
In this example, I have outlined the bit of “stream mat” so you can see it. To find it, I noticed (after hours of hiking the sand) a sort of pasty trail, a few inches wide, descending from a glacier. The glacier had melted previously, sending a trickle of melt water down to the valley. Where the stream flowed, cyanobacteria had photosynthesized like crazy, growing a mat in the stream. Once the stream dried up, the mat dried too–you can see the pebbles trapped in it. This summer, if the mat gets lucky, the glacier will melt again, and water will ooze once more down the mat. If not, the mat will dry and crack–and the wind might carry it to a nearby lake, where the edge melts in.
If the cyanobacteria end up in a lake, what grows there?
At the bottom of the lake, with barely a few photons to capture, the mats grow into amazing castles. (See Kay Vopel and Ian Hawes). Their cells make oxygen bubbles that ultimately lift bits of mat up to the ice, where the wind continually scrapes ice away, and eventually the mat bits surface–again to blow off to other lakes.
Who knows if such a mat cycle once happened on Mars? If it did, finding it would be quite a trick today.
Recall the mitochondrial singularity–my hypothesis that not only did the singularity already happen, we are evolving into the mitochondria of our own machines? And, like mitochondria, we don’t even notice. From the mitochondrion’s point of view, the organelle just gives up on activities that its host cell performs for it. Welcome to our posthuman future (or transhuman, if you prefer.) People who like the idea call it transhuman, whereas those who fear it cry, “Posthuman!”
So I’ve inaugurated a new feature–a review of this year’s less noticed stories of transhuman improvement. This year’s winner, more bizarre than most, is:
Robot camel jockeys. In the Persian Gulf, where camel racing is a time-honored sport, children as jockeys have been replaced by robots. The robots transmit commands from the masters, hovering nearby in cars. One wonders when the camels–and their masters–will be replaced as well.
Perhaps closer to home, with more urgent significance:
Ebola disposal robots. Disposal of contaminated clothes is the most dangerous part of tending Ebola patients. So why not let robots do the job of removing Ebola-contaminated garments? As we know, robots already serve other health care needs, such as calming dementia patients.
In another realm, our bid for immortality via stem cells advanced this year along several startling fronts. Perhaps the most surprising achievement was the conversion of adult skin cells into primordial germ cells–embryonic-like cells of a type that could produce sperm and egg. Human sperm and egg in a culture dish?
Other stem cell achievements this year:
- Insulin from embryonic stem cells can cure diabetes.
- Stem cells cured a spinal injury, generating axons the length of the spinal cord.
- Blood vessel formation in a mouse brain, from bone marrow stem cells.
- 3D printing of stem cells may form replacement organs.
What’s your favorite transhuman advance of the year? Or posthuman horror?
Thanks to all my friends for keeping my spirits up, while I survived Antarctica, that “harsh and unforgiving continent.” At my return, my new Ultraphyte was here waiting, custom designed by Little Fingers Gifts. You can meet the new ultra with me in February, at Boskone.
Those cyano mats haven’t yet come home (still frozen at Crary Lab, I hope) but they’ve already swept into the plot of Blood Star Frontier. And my Antarctica blog has been updated with videos that were too large for the bandwidth. Any videos you missed, here’s the list.
Ivan the Terra Bus, known as the slowest bus on Earth, takes us from runway across the Ross ice shelf to McMurdo Station. Note the wooden interior panels, and the lack of shocks. From Midnight Sunglasses.
Helicopter view of McMurdo Station, Antarctica. Facing the mountains across the Ross Sea, the helo rises, turning toward the helipad, the Crary Lab (three white buildings connected by ramp), the blue dining hall with dorms, fuel storage tanks (round white things), windmills above Scott Road; then a brief view of volcano Mount Terror, heading out across Ross Sea. Mount Discovery appears, then the Royal Society Range (I think). Then a long stretch of sea ice, ending with a giant flat iceberg.
The helicopter sails across the Ross Sea to the Dry Valleys. Glaciers surge down between the hills, then we reach frozen Lake Bonney. The white stuff is like frozen foam–hard as glass, vicious if you fall. Our camp appears below: the Jamesway, then the lab (green box-like thing).
The Freudian exercise–drilling a hole through 5 meters of ice!
Mars on Earth: The scenery around frozen Lake Bonney (East Lobe).
Three-helicopter day; the day the one got stuck. You can see two of the three in this video.
Back at McMurdo, we tour the Pressure Ridges, where the sea ice meets land ice. Huge blocks thrust upward, and the holes attract seals–but we humans try to keep dry.
Off to a new lake, Lake Fryxell. Amazingly, each lake and surroundings have specific character. Around Fryxell, the sand shrinks into polygons, “patterned ground.” You can see it clearest at 1:30-1:50. In the lake, meanwhile, look at all those frozen castles, surrounded by the smoother blue ice that will melt forming the moat.