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Bill Nye's Solar Sail Could Revolutionize Space Travel
The Planetary Society's solar sail is another step closer to spending its days in the sun. The world's largest space-interest nonprofit has unveiled the LightSail-2, the successor to the original LightSail CubeSat (or cube satellite used for space research) that successfully deployed its solar sails in space eight months ago.
The LightSail's mylar solar sails span 32-square-meters and are designed to capture sunlight and convert its pressure to propel the spacecraft forward. Photo credit: Josh Spradling / The Planetary Society
In June 2015, the Planetary Society proved that flight by light could be possible when it unfurled a solar sail in low-Earth orbit, paving the way for a full-fledged solar sail flight in 2016.
Once this technology is perfected, the LightSail could revolutionize and significantly lower the costs of space travel. Instead of rocket fuel, future spacecraft can be propelled by a sail that captures and converts the sun's photons into pressure that propels the spacecraft forward, thus making it an "inexpensive, inexhaustible means of propulsion," as the project's successful Kickstarter campaign pointed out.
As Vox wrote, what makes this project even more interesting is that it's not funded by NASA or a private enterprise. If successful, the LightSail project will essentially democratize space travel, as it's being built by the citizen-funded Planetary Society and the 23,331 backers who collectively pledged $1,241,615 to bring this crowd-funded project to life.
“Our mission at the Planetary Society is to advance space science and exploration. That’s what we do. That’s the elevator speech,” Bill Nye, CEO of the Planetary Society, told Motherboard. “Empower the world’s citizens to advance space science and exploration to know the cosmos and our place within it.”
The latest mission is expected to launch sometime this Fall. The LightSail-2 will travel on Georgia Tech’s Prox-1 satellite on Elon Musk's SpaceX Falcon Heavy rocket.
Here's what will happen to the LightSail once it's in orbit, as Gizmodo reported:
The new light sail features four triangular sails, made of mylar, which combine to form a rectangular-shaped surface. Once the [three unit] cubesat reaches an orbital altitude of 500 miles (800 km), the sails will deploy, extending across a total area measuring 32 square meters. The main test goal will be to assess whether the solar sails are a viable form of spacecraft propulsion.
This animation shows how the LightSail-2 will deploy from the Prox-1 satellite:
The idea of solar sailing came decades ago from Planetary Society founders Louis Friedman, Bruce Murray and Carl Sagan, who even stopped by Johnny Carson’s The Tonight Show to explain the technology.
“[It] travels on the radiation and particles that come out of the sun, the wind from the sun," Sagan said. "Because it has a constant acceleration, it can get you around the inner part of the solar system a lot faster ... than the usual sorts of rocket propulsion.”
Nye told Motherboard that besides interstellar space travel, the solar sail can be used in various other ways, from monitoring solar weather to helping a satellite de-orbit:
You’re required to have your satellite deorbit in 25 years. That’s an international rule being informally embraced, and people are working on treaties to formalize it. Getting a spacecraft to come down when you want it takes either fuel or dumb luck. With a sail, you can create all this drag. For example, where the ISS is, there are still a few air molecules. So when you deploy a sail, the thing comes down a thousand times faster than otherwise. Satellite manufacturers could very reasonably meet the requirements by including a little drag sail.
This video shows a test deployment of the LightSail 2's sails at California Polytechnic State University in January:
The Planetary Society's digital editor Jason Davis explains what happened in the video:
Unsurprisingly, [the] deployment tests revealed minor issues that engineers...have spent the past few weeks working to resolve. The deployment motor hesitated several times, not unlike the way it did during LightSail 1 testing. There was a glitch with the spacecraft’s onboard cameras, which capture staggered images during the sail deployment sequence. And additional refinements are still being applied to the spacecraft’s communications and attitude control systems.
A second round of system testing is planned at Cal Poly. This will pave the way for a full, day-in-the-life test as soon as March, when the spacecraft demonstrates its core mission functions one final time on the ground.
You can read the history of the LightSail here and learn more about the project in this video below:
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As a growing number of states move to pass laws that would criminalize pipeline protests and hit demonstrators with years in prison, an audio recording obtained by The Intercept showed a representative of a powerful oil and gas lobbying group bragging about the industry's success in crafting anti-protest legislation behind closed doors.
Speaking during a conference in Washington, DC in June, Derrick Morgan, senior vice president for federal and regulatory affairs at the American Fuel & Petrochemical Manufacturers (AFPM), touted "model legislation" that states across the nation have passed in recent months.
AFPM represents a number of major fossil fuel giants, including Chevron, Koch Industries and ExxonMobil.
"We've seen a lot of success at the state level, particularly starting with Oklahoma in 2017," said Morgan, citing Dakota Access Pipeline protests as the motivation behind the aggressive lobbying effort. "We're up to nine states that have passed laws that are substantially close to the model policy that you have in your packet."
Big Oil is now using its political power to try and criminalize protests of oil & gas infrastructure.— Friends of the Earth (@foe_us) August 19, 2019
"This legislation has potential to punish public participation and mischaracterize advocacy protected by the First Amendment."https://t.co/bmiHjONEhy
The audio recording comes just months after Texas Gov. Greg Abbott signed into law legislation that would punish anti-pipeline demonstrators with up to 10 years in prison, a move environmentalists condemned as a flagrant attack on free expression.
"Big Oil is hijacking our legislative system," Dallas Goldtooth of the Indigenous Environmental Network said after the Texas Senate passed the bill in May.
As The Intercept's Lee Fang reported Monday, the model legislation Morgan cited in his remarks "has been introduced in various forms in 22 states and passed in ... Texas, Louisiana, Oklahoma, Tennessee, Missouri, Indiana, Iowa, South Dakota, and North Dakota."
"The AFPM lobbyist also boasted that the template legislation has enjoyed bipartisan support," according to Fang. "In Louisiana, Democratic Gov. John Bel Edwards signed the version of the bill there, which is being challenged by the Center for Constitutional Rights. Even in Illinois, Morgan noted, 'We almost got that across the finish line in a very Democratic-dominated legislature.' The bill did not pass as it got pushed aside over time constraints at the end of the legislative session."
Many of the state bills restricting the right to protest have been "drafted by companies and passed through groups like ALEC, the secretive group of corporate lobbyists trying to rewrite state laws to benefit corporations over people." @greenpeaceusa https://t.co/ZxpTjWdrwT— Stand Up To ALEC (@StandUpToALEC) May 6, 2019
Reposted with permission from our media associate Common Dreams.