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Giant balloons launched into the stratosphere to beam internet service to Earth have helped scientists measure tiny ripples in our upper atmosphere, uncovering patterns that could improve weather forecasts and climate models.

The ripples, known as gravity waves or buoyancy waves, emerge when blobs of air are forced upward and then pulled down by gravity. Imagine a parcel of air that rushes over mountains, plunges toward cool valleys, shuttles across land and sea and ricochets off growing storms, bobbing up and down between layers of stable atmosphere in a great tug of war between buoyancy and gravity. A single wave can travel for thousands of miles, carrying momentum and heat along the way.

Although lesser known than gravitational waves —undulations in the fabric of space-time— atmospheric gravity waves are ubiquitous and powerful, said Stanford University atmospheric scientist Aditi Sheshadri, senior author of a new study detailing changes in high-frequency gravity waves across seasons and latitudes. They cause some of the turbulence felt on airplanes flying in clear skies and have a strong influence on how storms play out at ground level.

This week:

🚀 The first piece of NASA’s Orion Spacecraft #Artemis III pressure vessel arrived in New Orleans
👩🏿‍🚀 Astronaut Jeanette Epps is assigned to The Boeing Company’s Starliner crewed mission
🌀 Hurricane Laura observed from space.

Nearby supernova explosions shape the interstellar medium. Ejecta, containing fresh nucleosynthetic products, may traverse the solar system as a transient passage, or alternatively the solar system may traverse local clouds that may represent isolated remnants of supernova explosions. Such scenarios may modulate the galactic cosmic-ray flux intensity to which Earth is exposed. Varying conditions of the traversed interstellar medium could have impacts on climate and can be imprinted in the terrestrial geological record. Some radionuclides, such as ⁶⁰ Fe, are not produced on Earth or within the solar system in significant quantities. Their existence in deep-sea sediments demonstrates recent production in close-by supernova explosions with a continued influx of ⁶⁰ Fe until today.

Nuclides synthesized in massive stars are ejected into space via stellar winds and supernova explosions. The solar system (SS) moves through the interstellar medium and collects these nucleosynthesis products. One such product is ⁶⁰ Fe, a radionuclide with a half-life of 2.6 My that is predominantly produced in massive stars and ejected in supernova explosions. Extraterrestrial ⁶⁰ Fe has been found on Earth, suggesting close-by supernova explosions ∼2 to 3 and ∼6 Ma. Here, we report on the detection of a continuous interstellar ⁶⁰ Fe influx on Earth over the past ∼33,000 y. This time period coincides with passage of our SS through such interstellar clouds, which have a significantly larger particle density compared to the local average interstellar medium embedding our SS for the past few million years. The interstellar ⁶⁰ Fe was extracted from five deep-sea sediment samples and accelerator mass spectrometry was used for single-atom counting.

It’s extremely difficult to make a fair comparison of US and Chinese spend on technology like AI as funding and research in this area is diffuse. Although China announced ambitious plans to become the world leader in AI by 2030, America still outspends the country in military funding (which increasingly includes AI research), while US tech companies like Google and Microsoft remain world leaders in artificial intelligence.

The Trump administration will likely present today’s news as a counterbalance to its dismal reputation for supporting scientific research. For four years in a row, government budgets have proposed broad cuts for federal research, including work in pressing subjects like climate change. Only the fields of artificial intelligence and quantum computing, with their overt links to military prowess and global geopolitics, have seen increased investment.

“It is absolutely imperative the United States continues to lead the world in AI and quantum,” said US Chief Technology Officer Michael Kratsios ahead of today’s announcement, according to The Wall Street Journal. “The future of American economic prosperity and national security will be shaped by how we invest, research, develop and deploy these cutting edge technologies today.”

Tesla (NASDAQ: TSLA) has reached the $2,000 a share price point, but one investor says that its value could be looked at as “fairly low priced” in a year or two.

It’s hard to imagine that $2,000 for a share of an automaker’s stock could look like a bargain in the current economic climate. However, the CEO of AdvisorShares, Noah Hamman, thinks that TSLA’s price now could very well be looked at as a steal in a year or two.

“It’s possible a year or two from now we think that $2,000 a share was still fairly low priced, but who knows,” Hamman said to The First Trade, which is Yahoo Finance’s opening bell show.

Untangling the origins of Beelzebufo — the giant frog that lived alongside the dinosaurs — turns out to be one of the most bedeviling problems in the history of amphibians.

Thank you to these paleoartists for allowing us to use their wonderful illustrations:
Ceri Thomas: http://alphynix.tumblr.com/
Nobu Tamura: https://spinops.blogspot.com/
Julio Lacerda: https://252mya.com/gallery/julio-lacerda

Continue reading “The Biggest Frog that Ever Lived” »

Researchers link end of Green Sahara with Southeast Asia megadrought.

Physical evidence found in caves in Laos helps tell a story about a connection between the end of the Green Sahara — when once heavily vegetated Northern Africa became a hyper-arid landscape — and a previously unknown megadrought that crippled Southeast Asia 4,000 to 5,000 years ago.

In a paper published today in Nature Communications, scientists at the University of California, Irvine, the University of Pennsylvania, William Paterson University of New Jersey and other international institutions explain how this major climate transformation led to a shift in human settlement patterns in Southeast Asia, which is now inhabited by more than 600 million people.

Soaring temperatures, intensified flood risks and heightened water stress will threaten 57 U.S. nuclear plants over the next 20 years, forcing operators to take additional resiliency measures, according to a new report.

“The consequences of climate change can affect every aspect of nuclear plant operations—from fuel handling and power and steam generation to maintenance, safety systems and waste processing,” said the analysis, which was published yesterday by Moody’s Investors Service.

A team of researchers working at the University of Maryland has uncovered the structure of the mysterious blue whirling flame. In their paper published in the journal Science Advances, the group describes using computer simulations to determine the structure of the unique type of flame.

Back in 2016, a team of researchers discovered what they described as a blue whirling flame while they were studying the properties of liquid fuel floating on water. They had added fuel to a tank full of water that was enclosed in a space that generated a vortex. They described a fire that looked at first like a tornado, but then shortly after, settled into what they dubbed a blue whirling flame. They noted at the time that its color suggested it likely was very efficient, burning the fuel without creating soot—a property that might be useful in cleaning up oil spills. Since then, others have looked at the unique type of flame, but no one had tried to understand its structure. In this new effort, the researchers took a closer look at the flame and found it was actually three types of flames that had merged into one.

To learn more about the nature of the blue whirling flame, the researchers created computer simulations using conditions known to generate them. They then slowly adjusted the parameters until they were able to generate the flame virtually. They discovered that the flame was actually the result of three known types of flames merging: those with an invisible outer flame, which happens when there is less fuel than oxygen in the mix—and two that had types of visible inner flames in which higher fuel ratios are more common.