Can the Little People (ie, US) Beat Xcel Energy in Boulder? These People Say YES

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Xcel Energy, the people who started up the Colorado solar-to-home movement only to withdraw from it quicker than John Wayne Bobbitt lost his wang, are back at the douchebaggery again.  This time, a group of very smart and very environmentally conscious people called New Era Colorado is putting the kibosh on their plans for coal-fired world domination.  Check this out:

From the video page:

This is a grassroots David and Goliath campaign to create a landmark model for how communities can take control of their energy future: http://igg.me/at/localpowerYou can support this effort on Indiegogo:http://igg.me/at/localpower

This is pretty great.  These folks are simply trying to stop the mass amounts of money from flowing into the pockets of the “we don’t give a shit” power brokers and back into the hands of the community, and to save the Earth one city at a time.  Can you imagine what would happen if this works?  I for one would love to see solar panels and wind turbines out en masse instead of coal fired plants spewing black death into the atmosphere.  But, that’s just me.  I’m sure the Xcel Energy executives need their Mercedes and homes in the Hamptons, too.  Right?

Check out the Campaign for Local Power’s IndieGogo campaign.  Feeling frisky?  Donate ten bucks, you’ll literally change the world.

From the IndieGogo campaign website:

Back in 2011, our community did something no other community had ever done before: we voted to explore taking control of our power supply for the sole purpose of lowering our impact on the planet. Xcel Energy spent nearly $1 million dollars on that election, but lost–because a committed group of community advocates and a small nonprofit that engages young people in politics won the day. Outspent 10-to-1, the grassroots coalition registered voters, knocked on doors, and made thousands of phone calls.

With voter approval, the city launched an extensive analysis and found that it could get cleaner, cheaper power that was just as reliable all on its own.

But now, Xcel is back, with a misleading initiative they’ve helped place on Boulder’s fall ballot that would stop the city’s formation of a local electric utility dead in its tracks. Their ballot measure is masquerading as a way to reduce government debt, but it’s really just a dirty trick–the measure includes impossible, even illegal, requirements that would stall out the very process voters already approved.

They’re back to undermine our local process, because the city’s findings made it clear that they stand to lose more than the $35 million dollars in profits they make annually from Boulder. They know that Boulder is on the verge of setting a precedent of national significance that would threaten not just Xcel, but the very core of the coal energy’s business model–not to mention that industry’s billions of dollars in profits.

We out-organized them in 2011, and we know we can again in 2013 if we have the resources to achieve the reach we need. Boulder has already voted to move forward–this fight is about keeping the coal industry from holding us back.

Can you help these smart people defeat the coal giant in the region?  Like New Era Colorado on Facebook, I’m sure they’d appreciate it.  Xcel Energy will not.

Saturday Sustainability News

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It’s Saturday again, which means that there are lots of people waking up on either A) the hung-over side of the bed, B) someone else’s side of the bed, or C) the well-rested side of the bed, which is where I woke up this morning!

This morning brings some sustainability news stories, covering solar, wind, geothermal, and tidal power wherever possible.  There’s only one reason why we can’t take ahold of sustainable and renewable energy sources right at the time when we need to develop them the most, and that’s because not enough people are stepping up.  I can’t be the only person who believes that we could all live on a planet that is consuming less power than we can generate, and where there’s enough of everything for everybody…

…or can I?

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Sustainability News

  1. The Ivanpah Solar project is over 90% complete, nearing a total of 173,500 heliostats!

  2. First Solar has 400 million in cash from their most recent stock offering…  How will they spend it?

  3. University of Florida added some solar panels to University apartment carports.  Brilliant move, UF!

  4. German community-owned solar arrays!

  5. Flattening peak and base energy prices – Analysis

  6. Conergy says Australian solar markets will grow 20% a year until 2015

  7. Goldman Sachs plans to invest in an offshore wind farm in Japan

  8. US solar market grew 76% in 2012…!!!

  9. The US leads Clean Energy mergers and acquisitions (M&A’s), Solar stays in the lead

  10. Italy reaches clean energy budget cap, stops offering tariffs on new clean energy installs

  11. Geothermal energy starts the list of US Army’s nearly ready power purchasing agreement binge

  12. Renewable energy investments focus on developing nations

  13. Solar tracking systems gain some public footing

  14. Are solar panels as inexpensive as paint nowadays?

  15. California needs 3 BILLION to finish its Energy Storage Plan

  16. New ideas for a power plant — that lives at the bottom of the ocean

  17. Ladies and Gentlemen, the first artificial photosynthesis nanosystem

  18. Solar in California breaks the 2 Gigawatt output mark!

  19. Making cheaper and more flexible silicon crystalline wafers for Solar

  20. The coming US distributed solar boom

  21. Big Coal in India takes a nibble of Solar investment

  22. Solar plane makers shows what it takes to build a solar airplane

  23. MECASOLAR from Spain leads a huge EU research and development project into Solar

  24. A strategic agreement has been met to create deployable solar panels

  25. Comcast’s “Connected Home” has smart light bulbs, web-programmable thermostats

Have an awesome sunny Saturday, everyone!

20 Really Awesome Facts about Solar Power

labcoat-jimonlight

I love discovering new facts about pretty much anything.  Any day I can learn something is an awesome day.  Any day I can learn something new about light, it’s an even better day!

Here’s 20 Really Awesome Facts about Solar Power!

  1. The first working, practical, usable solar cell was created by Bell Laboratories in 1954.  It only produced 1 Watt of energy for $250/Watt.  Now that’s Cost INeffective!
  2. Photovoltaic (PV) cells made from the silicon in 1 ton of sand can produce as much electricity as burning 500,000 tons of coal in a power plant.  Why are we burning coal again?
  3. Light that comes from the Sun takes approximately 8 minutes and 20 seconds to hit the Earth.  How’s that for light speed?  Wacka wacka!
  4. In the state of California, if we covered every available commercial and industrial roof with solar power panels, ALL of California’s electricity demand could be generated during the daytime, forever.
  5. A few hundred years ago while traveling to Africa, a scientist named John Herschel created a cooker using the Sun to cook food, inventing the first Solar Cooker.
  6. The first traceable use of the Sun as a tool was back in 700 BC, when people learned how to concentrate the Sun’s rays with the use of a magnifying glass of sorts.  As a kid I always felt terrible about the thought of burning ants, which is probably why I never joined the Military!
  7. In 1981, a man named Paul Macready produced the first solar powered plane — Paul’s plane used more than 1600 solar cells mounted on its wings.  Paul Macready flew from France to England.
  8. 2012 was an unbelievable year for massive solar collection plants.  The largest solar energy plant is the Golmud Solar Park in China, with an installed capacity of 200 megawatts.  Arguably, this is surpassed by India’s Gujarat Solar Park, a collection of solar farms scattered around the Gujarat region with a combined installed capacity of 605 megawatts.
  9. There are two types of Solar Panels for use in commercial and residential applications — Photovoltaic panels and Solar Thermal panels.  PV panels work by converting the Sun’s rays to electricity, and Solar Thermal panels work by absorbing the Sun’s heat energy to warm up water by circulating the water through it.
  10. Solar collection on its own is a carbon neutral, pollution-free method of collecting and generating energy.  The only carbon creating part of solar power is the manufacture of Solar Panels and the accessories that go into building a solar panel system.
  11. In one hour, the Sun provides more energy to Earth than the whole world uses all year.  Approximately 120,000 terawatts (TW) hit the Earth’s surface each day.  Over the course of a year, the world only uses 15 TW of energy.
  12. The diameter of our Sun is 1,392,000 kilometers across while Earth is just 12,756 kilometers across.  Earth is 109 times smaller than our Sun, and our Sun can hold over a million Earths (that is if we didn’t become like the bits at the bottom of the pan of bacon before we got all of the one million in there).
  13. In only 20 days, the Sun could match the power of all of the world’s resource stockpiles of oil, coal, and natural gas.  Why are we ruining our world with crap energy sources again?
  14. Regardless of the completely negative and destructive effects of continuous usage of oil, coal, and natural gas in the world’s countries, human civilization is very slow to adopt Solar Power to replace even one of the non-renewable energy sources.  As of September 2012, only 0.05% of the world’s power comes from Solar sources.  Doesn’t that disgust you?
  15. Of all the Solar energy that strikes Earth, only 50% is absorbed by Earth while 30% of it is reflected back into space.
  16. To date, the most efficiency that solar power manufacturers can reach is barely 47.12%.  So for all of the sunlight that burns down onto a solar panel, at best there will only be around 40% converted.  This is also a best-case scenario, and the actual percentage is considerably lower based on many factors.  Typically, efficacy of Solar panel technology is around 15%.
  17. Production of 1 kilowatt of solar energy is equivalent to burning 170 pounds of coal which releases 300 pounds of carbon dioxide.  This is comparable to preventing 15 gallons of gas from ever being used!
  18. If you cover 10,000 square miles of land in the Southwest United States, it would generate enough power to meet the energy needs of the entire country!  To silence the anti-Solar power whiners on the Internet, the US has strip-mined at least that amount for coal.  No wonder the environment is slipping.
  19. As of October 2012, Germany is using Solar power with the most fervor, followed by China.
  20. The real kicker — all current fossil fuels are just stored versions of Solar energy!

Have a great day, everyone!

solar power tower

Thanks to Going Green, All Purpose Guru, Wikipedia on John Herschel, Solar Gadgets, USDoE, Explore Green Tech, St. Gobain Solar, Green Building, Renewable Power News, and International Energy Association!

What If The Sun Disappeared?

vsauce

This is a crazy subject, but vlogger VSauce (who is really Michael Stevens) really hit this one on the head!  What would happen if our Sun just…disappeared?!

WATCH THIS!

This guy VSauce has some awesome videos, check him out.  I’m all about the learnin’, as you know…

We Can’t Stop Asteroids from Smashing Humanity into Powder

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With a headline like that, one would think this would be bigger news than anything Kim Kardashian might produce, even trumping what color baby bib little cranky monkey Justin Bieber might be wearing today.  But, you’d be wrong.

Here’s the fact of the matter:  all over Earth right now – scientific organizations, special lobbying groups, NASA, the European Space Agency, et al – are telling lawmakers and news outlets that we need to get a collective effort going to solve the problem of hey, what happens if a global killer asteroid smashes into Earth?  Can we protect ourselves?  After all, apparently it only takes one medium-sized asteroid, something around a kilometer in width.  You saw Armageddon, right?  Billy Bob Thornton’s character makes it perfectly clear what would happen if that big rock in the movie slammed into the ocean – and this is just the movies:

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“Even if the asteroid itself hits the water, it’s still hitting land. It’ll flash boil millions of gallons of sea water and slam into the ocean bedrock. Now if it’s a Pacific Ocean impact, which we think it will be, it’ll create a tidal wave 3 miles high, travel at a thousand miles an hour, covering California, and washing up in Denver. Japan’s gone, Australia’s wiped out. Half the world’s population will be incinerated by the heat blast, and the rest will freeze to death from nuclear winter.”

Now, that’s just lines from a movie.  But even for a movie that’s pretty hardcore!  Can you imagine it?  I’ve had some bad days, but that sounds horrible.  Thank goodness it’s only the movies.  Are we actually supposed to entrust Billy Bob Thornton with our astrophysical safety, he was also the “french fried pertaters” guy in Slingblade?!  Of COURSE we are!

asteroids-coming copy

Back in the real world that I live in, I ask myself exactly what might happen if a thousand thousand tons of rock slams into the bedrock of Earth.  In that other movie about asteroids with Morgan Freeman (It’s called Deep Impact, and I hear that many a porno has been modeled after the title), astronauts were able to not exactly save Earth, but they were able to pulverize the asteroid enough so that only a smaller chunk of it smashed into Earth.  Still, that smaller chunk made the seas rise a few hundred feet, created a big tidal wave that made the Atlantic wash up into Tennessee and killing a few hundred million Americans.  But that was still just a movie!  Right?!

Asteroid 433 Eros, a planetary killer discovered in 1898, has a dimension of 34.4 kilometers by 11.2km by 16.84 km.  It's the size of a large midwestern city.

Asteroid 433 Eros, a planetary killer discovered in 1898, has a dimension of 34.4 kilometers by 11.2km by 16.84 km. It’s the size of a large midwestern city.  433 Eros is a potential Earth impactor.

What Do Earth’s Scientists Think?

Scientists are all over the freaking place about this very real issue right now.  Some people are deeply concerned, others think that there’s such a little chance that it would ever happen:

“Right now, based on our survey, we see no national imperative for this nation to be upset or excited about impending doom.”  – James L. Green, Director of NASA‘s Planetary Science Division, on Discovery

Perhaps the most daunting answer to come from the House Science Committee hearing with John Holdren was this:  “An asteroid of that size, a kilometer or bigger, could plausibly end civilization… from the information we have, we don’t know of an asteroid that will threaten the population of the United States.  But if it’s coming in three weeks, pray.”   – White House Science Advisor John Holdren

University of California Santa Barbara physicist Philip M. Lubin thinks we should start small on smaller asteroids first – ones we know are coming:  ““We need to be proactive rather than reactive in dealing with threats. Duck and cover is not an option. We can actually do something about it, and it’s credible to do something. So let’s begin along this path. Let’s start small and work our way up. There is no need to break the bank to start.”

Scientists don’t disagree that something needs to be done.  What they do differ on is how it needs to be done.  Some scientists feel that some sort of projectile, either nuclear or otherwise, should be thrown at the asteroid somehow.  Some think that attaching some kind of “solar sail” or assisted rocket takeoff device on a grand scale would be the best bet.  One scientist even suggests painting the asteroid in order to change the amount of light it reflects.  Others, seriously yet still funny enough, make jokes in Senate hearings about “calling Bruce Willis,” while actual scientists theorize about possibly making a huge laser and reflector work as our asteroid goalkeeper.  Lest we not forget that Bruce Willis was not only an asteroid killer in the movies, but also Died hard a whole bunch of times.  Like, a TON of times.  How many times can you actually die hard?  Maybe he can just tell the asteroid to go f*ck itself while shooting at it.  Since John Holdren pretty much summed our Earth-asteroid defense systems with “if it [an asteroid] comes in the next three weeks, pray,” then maybe some fictional help might not hurt!

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A few of these ideas that scientists are kicking around still in theory format:

Yarkovsky Paint
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The long and the short of this idea is to change the amount of light that the asteroid emits in IR photos, eventually causing a miniscule “rocket thrust” in one direction.  The article at Wired explains this fantastically:

The Yarkovsky effect works by changing the amount of light an asteroid gives off. As an asteroid rotates, the surface that has been heated by the sun moves away to face space and radiates infrared photons. Though massless, these photons carry away small bits of momentum from the asteroid, essentially generating a tiny rocket thrust in one direction. The effect is very slight but over time can noticeably change an asteroid’s orbit. By making an asteroid lighter or darker, and therefore changing the amount of radiation it absorbs, we could turn up or down this miniscule rocket thrust. It’s a long haul-technique, requiring years, decades, or even centuries of advanced notice to alter an asteroid’s trajectory.

Will it work?  I have no idea.  I don’t think we have “decades or even centuries” to wait it out, though!

DE-STAR, or Directed Energy Solar Targeting of Asteroids and exploRation

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DE-STAR is basically a re-directing and re-purposing of the Sun’s energy into little laser blasts that might be able to either re-direct or completely vaporize an approaching asteroid over the course of a year.  From a post at Popular Science:

Described as a “directed energy orbital defense system,” DE-STAR is designed to harness some of the power of the sun and convert it into a massive phased array of laser beams that can destroy, or evaporate, asteroids posing a potential threat to Earth. It is equally capable of changing an asteroid’s orbit –– deflecting it away from Earth, or into the Sun –– and may also prove to be a valuable tool for assessing an asteroid’s composition, enabling lucrative, rare-element mining. And it’s entirely based on current essential technology.

The DE-STAR team also claims that their system might also be able to push a spacecraft at the speed of light into the unknown.  More on that in another post.

Surfing An Asteroid On Solar Sails

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Solar Sails are something that have taken on validity in this race to figure out how to mitigate the asteroid threat.  This would basically consist of a huge solar sail deployed in space, making good use of the ever-present solar pressure that is exerted on objects in space.  From How Stuff Works:

The reflective nature of the sails is key. As photons (light particles) bounce off the reflective material, they gently push the sail along by transferring momentum to the sail. Because there are so many photons from sunlight, and because they are constantly hitting the sail, there is a constant pressure (force per unit area) exerted on the sail that produces a constant acceleration of the spacecraft. Although the force on a solar-sail spacecraft is less than a conventional chemical rocket, such as the space shuttle, the solar-sail spacecraft constantly accelerates over time and achieves a greater velocity.

Interesting.  The principle of solar pressure also kind of tickles me in that special place.  But again, another post for another time.

Potential Impact of Potential Impacts

Watch this – the recent asteroid that exploded over Chelyabinsk, Russia, which exploded around 40 miles above the town with the force of 300 Hiroshimas, was 55 feet across, and injured over 1500 people.  This was in a sparsely populated area, so imagine the impact of an asteroid exploding over San Francisco or New York City:

Also, if you have some time (or want to skip through to where John Holdren tells the Senate Committee that if an asteroid comes to NYC in the next three weeks that we can only pray), check out John Holdren’s Senate Hearing en toto.  It’s actually pretty interesting right off the bat — it might also be interesting to hear the almost comical questions and answers from our elected legislators to these scientists presenting scary information to Congress, not to mention the entire House Science Committee turning every answer of these scientists into how much it would cost and all of the interrupting that these scientists had to endure:

Thanks to:
Mother Jones
Daily Mail
Red Orbit
Space Politics
The Register
NBC’s Cosmic Log
Wikipedia on Asteroid Impact Avoidance

Smart Power Metering in Europe – Changes, Challenges, Opportunities

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I saw this great video on CleanTechnica about Smart Power Metering in Europe — the lecture, which is about 30 minutes or so, is about some of the potential policy changes, regulation challenges, and business opportunities that this idea could set forth in Europe with power suppliers.  This was all set forth over something that actually happened this last November 2012 – Deutsche Telekom and a technology company called Itron signed a deal to start supplying European customers with Smart Metering.  From the press release at Business Wire:

LIBERTY LAKE, Wash.–()–Itron, Inc. (NASDAQ:ITRI), a global technology company that helps utilities measure, manage, and analyze energy and water, and Deutsche Telekom, a world leading integrated telecommunications company, announced today that they have signed an agreement to collaborate on delivering smart metering solutions to target markets in Europe. This agreement brings two leading companies together in the smart grid and smart metering space to combine their technology expertise to better serve the utility industry.

“This collaboration will give our customers more options and will deliver real business benefits as they roll-out smart meter systems.”

Under this agreement, the two companies will utilize Itron’s innovative smart meter solutions, Deutsche Telekom’s M2M capabilities, Information and Communication Technology solutions and Intelligent Networks Energy solution offering to bring an even more comprehensive solution and service offering to European markets. This coupled with the strength of two large and experienced companies combining efforts to create more options for customers will result in tremendous opportunities for utilities.

“Working with a world-class organization like Deutsche Telekom is a true pleasure,” said Remy Brill, Itron vice president and managing director, EMEA Energy. “This collaboration will give our customers more options and will deliver real business benefits as they roll-out smart meter systems.”

Check this out, this is a great video to watch over lunch or a coffee — lots of great discussion points!  This comes from Zachary Shahan, who has probably THE BEST research I’ve seen on Renewable Energy.  PLEASE check it out if this is something you want to know about, you’ll be very informed afterwards.

Gallons of Light – A Tesla Motors Story

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Have you heard of the Tesla “Gallons of Light” video?  A guy named Jordan Bloch, filmmaker and storyteller, decided one day while out with his girlfriend that he would — nah, you know what, here.  I’ll let Jordan tell the story:

It was November 2012, and I had just moved from New York City to Los Angeles. My girlfriend and I were walking down the 3rd Street Promenade in Santa Monica, CA, and I noticed the Tesla retail store.

I’d heard about Tesla, but seeing the car in person…I was floored. Beyond the car itself, Tesla was creating a network of free, solar-powered Superchargers in partnership with Solar City. This was the future of transportation.

As I looked around the store, my eyes wandered to plasma screens showing footage of the Model S. Frankly, I wasn’t impressed. Where was the cinematic flair, the story, the emotion? I knew I could do better.

As I stared at the monitors surrounding me, I saw an incredible opportunity: to create a commercial that tied together the Model S and the Superchargers.

I went home and contemplated the challenge I was up against. Where would I get a Model S for my project? A hot commodity, the car was massively backordered.

The prospect was daunting to say the least….

So he made this:

This is pretty cool — I mean other than it being a marketing campaign, which pretty much everything in our lives is, from every angle.  But Jordan, your marketing campaign is excellent.

Misnomer Majestica: Fire Rainbows

So-called Fire Rainbows actually have nothing to do with fire or rainbows, however they are absolutely awesome! The correct nomenclature for this optical phenomenon is circumhorizontal arc (circumhorizon arc and lower symmetric 46° plate arc are also accepted). A multi-colored halo (spanning from the red wavelengths at the top to the indigo like a rainbow) that runs parallel to the horizon occurs when the sun’s height in the sky is more than 58° above the horizon and its light passes through a cirrus cloud or haze consisting of ice crystals. These ice crystals must be hexagonal and plate-shaped, facing parallel to the ground. When light enters the top of the ice crystal through its vertical side face, and exits bending through the lower horizontal face, it separates like a prism.

While the circumhorizontal arcs are indeed arcs, they frequently only appear in small sections of wispy cirrus clouds where the ice crystals are properly aligned, which leads to the misnomer “fire rainbow”. Here’s a small gallery of this spectacular optical phenomenon:

Solar Powered Plane!

I’m trying hard to avoid making the “it’s a bird!” jokes, but this solar powered plane certainly packs a punch in the sky! How gorgeous! Presenting Solar Impulse, a photon-fueled, flying phenomena hoping to soar above your head soon. A project undertaken by Bertrand Piccard (co-pilot of the first balloon to circumnavigate the world) and André Borschberg, the plane has successfully completed journeys taking place in both daylight and night.

The plane relies entirely on solar energy, from take off to landing and beyond. HB-SIA, as it is identified, has lasted over an entire diurnal cycle, 26 hours to be exact. Extraordinarily efficient, the plane can continue flying overnight, with the batteries completely refueling . With temperatures of -40°C reached at 8,500 meters, the plane even recycles the heat generated by the batteries.

Form follows function, and oh does the HB-SIA have style. The wingspan of an Airbus A340 is adorned with almost 12,000 photovoltaic cells which charge lithium-polymer batteries. The cells chosen are monocrystalline silicon cells, each 150 microns thick. According to Solar Impulse’s fascinating HB-SIA brochure, “At 22%, their [cells] energy efficiency could have been higher, but the additional weight would have penalized the aircraft during night flight. In this, the most critical stage, the major constraint of the project is storing energy in the lithium polymer batteries. At the present stage, the maximum energy density is 220 Wh/kg. The accumulators needed for night flight weigh 400 kg, equal to ¼ of the total weight of the aircraft. Success is therefore possible only by maximizing aerodynamic performance and optimizing the energy chain.”  The large wingspan minimizes induced drag and offers as much area as possible for cells to harness sun energy. Despite the immense width of the plane, it weighs about the same as a car!

Best of all, Solar Impulse is not resting on its laurels–the team is itching for more. The speed of the plane is quite slow in comparison to its hefty shared wingspan Airbus A340, or in fact most jets we are familiar with, but it’s still an immensely impressive plane. The second version of the plane, HB-SIB, will begin retracing aviation history, starting with crossing the Atlantic Ocean and United States of America and culminating in a circumnavigation of the globe!

I love the “Here’s to the Crazy Ones” mentality of Mr. Piccard:

«If an aircraft is able to fly day and night without fuel, propelled only
by solar energy, let no one claim that it is impossible to do the same
thing for motor vehicles, heating and air conditioning systems and
computers. This project voices our conviction that a pioneering spirit
with political vision can together change society and bring about an
end to fossil fuel dependency.»
Bertrand Piccard

 

 

Thank you to Boston’s Big Picture blog for the title image, and Solar Impulse for the rest.

(Now I’m ITCHING to design a pair of solar-powered wings for myself. Any tips?)

Midnight Sun

Our sun is absolutely astounding, and that’s no news, especially for JOL readers. However, the grand winner of a National Geographic exploration trip through X Prize, Joe Capra, entered with a stunning video about our home star’s polar seasonal effects so delightfully, I had to share.

In areas north of the arctic circle or south of the antarctic circle, in summer months the sun can be visible for up to twenty-four hours of the day, sinking but never dropping below the horizon line. This is similar to the effect of “white nights” where latitudes as low as sixty degrees experience midnight twilight, though in white nights the sun does go below the horizon line. In his film’s narration, Mr. Capra speaks about how because of the midnight sun effect, he had almost six hours between sunset and sunrise of low-level light to shoot.

Check out Mr. Capra’s video, “Land of the Midnight Sun” (RSS readers, please click through!):

A beautiful video on the opposite effect, polar night, Jim shared here.