Designing, building, and launching a spacecraft is hugely expensive. That’s why NASA missions to Mars are designed with the hope that they’ll last as long as possible — like the famous Opportunity rover which was supposed to last for 90 days and managed to keep going for 15 years. The longer a mission can keep running, the more data it can collect, and the more we can learn from it.

That’s true for the orbiters which travel around Mars as well as the rovers which explore its surface, like the Mars Odyssey spacecraft which was launched in 2001 and has been in orbit around Mars for more than 20 years. But the orbiter can’t keep going forever as it will eventually run out of fuel, so figuring out exactly how much fuel is left is important — but it also turned out to be more complicated than the NASA engineers were expecting.

Odyssey started out with nearly 500 pounds of hydrazine fuel, though last year it looked as if the spacecraft was running much lower on fuel than had been predicted.

Recorded on February 10th, 2023.

Historian Stephen Kotkin became the Kleinheinz Senior Fellow at the Hoover Institution in 2022. He taught at Princeton for more than 30 years, and is the author of nine works of history, including the first two volumes of his biography of Joseph Stalin, Paradoxes of Power, 1,878 to 1928 and Waiting for Hitler, 1929 to 1941. He is now completing the third and final volume. Since the war in Ukraine broke out a year ago, Kotkin has appeared regularly on Uncommon Knowledge with Peter Robinson to offer his unique perspective on the Russian aggression and answer five questions for us. This is the third installment.

For further information:
https://www.hoover.org/publications/uncommon-knowledge.

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A newly developed electric vehicle battery not only can store up to four times more energy than current batteries but is also a safer alternative.

The researchers hope to develop strategies to stop or at least restrict growth at the negative pole.

Researchers at the Max Planck Institute for Polymer Research have focused on the life cycle of solid-state batteries, and their research could lead to longer-lasting batteries.

The so-called “solid-state batteries” are considered the “Holy Grail” of battery development. They no longer have a liquid core, like modern batteries, but rather a solid substance. This has various benefits, including the fact that these batteries may be produced on a smaller scale and are trickier to ignite.

John D/iStock.

A team of physicists and material scientists at the University of Colorado has developed a way to better insulate double-paned glass used for windows by adding a transparent aerogel. In their paper published in the journal Nature Energy the group describes how their aerogel is made and how much of a boost in energy efficiency can be expected from windows using the material. Nature Energy has also published a Research Briefing in the same journal issue that outlines the work done by the team.

Since most homeowners prefer to have windows that allow them to see outside, heat loss is inevitable. Over the past several decades, heat loss from windows has been improved by adding a second pane of glass —the two panes are typically separated by a gap of insulating air. Still, such windows do not provide nearly the same degree of insulation as insulated walls. In this new approach, the team in Colorado has come up with a way to improve the insulation properties of double-paned glass.

To make the aerogel (a gel with pockets of air in it), the research team soaked nanofibers of cellulose extracted from wood in water. Next, the wood nanofibers were removed and were then dunked in an ethanol solution. Once saturated, the nanofibers were heated in a pressurized oven—this forced the ethanol pockets to be replaced with air. Next, the nanofibers, which were transparent, were coated with a water-repellent material to prevent condensation when situated between panes of glass.

I really love this.

Boeing and NASA have teamed up to radically redesign wings on commercial airliners.

The Transonic Truss Based Wing is about 50 percent longer and much thinner, improving fuel efficiency by 10 percent, and reducing the cost and emissions of future airliners.

Seems a fairly simple change with significant benefits, are there any downsides?

How Boeing and NASA may reinvent the wing to reduce the cost and emissions of air travel.

I’ve asked it to write a recursive λ-Calculus parser in JavaScript. It outputted a 100% clean working function. GPT 3.5 failed every time. I’ve then asked it to convert it to Python, and add sarcastic GLaDOS comments all over the code. Nailed it.

Physicists were surprised by the 2022 discovery that electrons in magnetic iron-germanium crystals could spontaneously and collectively organize their charges into a pattern featuring a standing wave. Magnetism also arises from the collective self-organization of electron spins into ordered patterns, and those patterns rarely coexist with the patterns that produce the standing wave of electrons physicists call a charge density wave.

In a study published this week in Nature Physics, Rice University physicists Ming Yi and Pengcheng Dai, and many of their collaborators from the 2022 study, present an array of experimental evidence that shows their charge density wave discovery was rarer still, a case where the magnetic and electronic orders don’t simply coexist but are directly linked.

“We found magnetism subtly modifies the landscape of electron energy states in the material in a way that both promotes and prepares for the formation of the charge density wave,” said Yi, a co-corresponding author of the study.

What do a T-shirt, a rug, and a soda bottle have in common? Many are made from polyethylene terephthalate (PET), a ubiquitous plastic that revolutionized the materials industry after it was patented in the 1940s.

Created from petroleum refining, PET is a material known for its durability and versatility. It is easily molded into airtight containers, woven into durable carpets, or spun into polyester clothing.

“The reality is that most PET products—especially PET clothing and carpeting—are not recycled today using conventional recycling technologies,” explained Gregg Beckham, senior research fellow at the National Renewable Energy Laboratory (NREL) and CEO of the U.S. Department of Energy BOTTLE Consortium. “The research community is developing promising alternatives, including enzymes designed to depolymerize PET, but even these options have tended to lean on energy-intensive and costly preprocessing steps to be effective.”

Exploiting the natural and energy resources of the moon and asteroids can spark a space-based industrial revolution that could be a boon to all humankind. Pure science alone will be enough reason for the people who pay the bills to finance space exploration. Accessing the wealth that exists beyond the Earth is more than enough incentive for both public and private investment. Science will benefit. Someone will have to prospect for natural and energy resources in space and to develop safe and sustainable ways to exploit it.

Conflict between scientists and commercial space is already happening. Astronomers complain that SpaceX’s Starlink satellite internet constellation is ruining ground-based observation. Some critics fear that commercial exploitation of the moon’s resources will impede the operation of telescopes on the far side of the moon.