Timothy J McCoy, Smithsonian Institution and Sara Russell, Natural History Museum

A bright fireball streaked across the sky above mountains, glaciers and spruce forest near the town of Revelstoke in British Columbia, Canada, on the evening of March 31, 1965. Fragments of this meteorite, discovered by beaver trappers, fell over a lake. A layer of ice saved them from the depths and allowed scientists a peek into the birth of the solar system.

Nearly 60 years later, NASA’s OSIRIS-REx mission returned from space with a sample of an asteroid named Bennu, similar to the one that rained rocks over Revelstoke. Our research team has published a chemical analysis of those samples, providing insight into how some of the ingredients for life may have first arrived on Earth.

Born in the years bracketing the Revelstoke meteorite’s fall, the two of us have spent our careers in the meteorite collections of the Smithsonian Institution in Washington, D.C., and the Natural History Museum in London. We’ve dreamed of studying samples from a Revelstoke-like asteroid collected by a spacecraft.

Then, nearly two decades ago, we began turning those dreams into reality. We joined NASA’s OSIRIS-REx mission team, which aimed to send a spacecraft to collect and return an asteroid sample to Earth. After those samples arrived on Sept. 24, 2023, we got to dive into a tale of rock, ice and water that hints at how life could have formed on Earth.

The CI chondrites and asteroid Bennu

To learn about an asteroid – a rocky or metallic object in orbit around the Sun – we started with a study of meteorites.

Asteroids like Bennu are rocky or metallic objects in orbit around the Sun. Meteorites are the pieces of asteroids and other natural extraterrestrial objects that survive the fiery plunge to the Earth’s surface.

We really wanted to study an asteroid similar to a set of meteorites called chondrites, whose components formed in a cloud of gas and dust at the dawn of the solar system billions of years ago.

The Revelstoke meteorite is in a group called CI chondrites. Laboratory-measured compositions of CI chondrites are essentially identical, minus hydrogen and helium, to the composition of elements carried by convection from the interior of the Sun and measured in the outermost layer of the Sun. Since their components formed billions of years ago, they’re like chemically unchanged time capsules for the early solar system.

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So, geologists use the chemical compositions of CI chondrites as the ultimate reference standard for geochemistry. They can compare the compositions of everything from other chondrites to Earth rocks. Any differences from the CI chondrite composition would have happened through the same processes that formed asteroids and planets.

CI chondrites are rich in clay and formed when ice melted in an ancient asteroid, altering the rock. They are also rich in prebiotic organic molecules. Some of these types of molecules are the building blocks for life.

This combination of rock, water and organics is one reason OSIRIS-REx chose to sample the organic-rich asteroid Bennu, where water and organic compounds essential to the origin of life could be found.

Evaporites − the legacy of an ancient brine

Ever since the Bennu samples returned to Earth on Sept. 24, 2023, we and our colleagues on four continents have spent hundreds of hours studying them.

The instruments on the OSIRIS-REx spacecraft made observations of reflected light that revealed the most abundant minerals and organics when it was near asteroid Bennu. Our analyses in the laboratory found that the compositions of these samples lined up with those observations.

The samples are mostly water-rich clay, with sulfide, carbonate and iron oxide minerals. These are the same minerals found in CI chondrites like Revelstoke. The discovery of rare minerals within the Bennu samples, however, surprised both of us. Despite our decades of experience studying meteorites, we have never seen many of these minerals.

We found minerals dominated by sodium, including carbonates, sulfates, chlorides and fluorides, as well as potassium chloride and magnesium phosphate. These minerals don’t form just when water and rock react. They form when water evaporates.

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We’ve never seen most of these sodium-rich minerals in meteorites, but they’re sometimes found in dried-up lake beds on Earth, like Searles Lake in California.

Bennu’s rocks formed 4.5 billion years ago on a larger parent asteroid. That asteroid was wet and muddy. Under the surface, pockets of water perhaps only a few feet across were evaporating, leaving the evaporite minerals we found in the sample. That same evaporation process also formed the ancient lake beds we’ve seen these minerals in on Earth.

Bennu’s parent asteroid likely broke apart 1 to 2 billion years ago, and some of the fragments came together to form the rubble pile we know as Bennu.

These minerals are also found on icy bodies in the outer solar system. Bright deposits on the dwarf planet Ceres, the largest body in the asteroid belt, contain sodium carbonate. The Cassini mission measured the same mineral in plumes on Saturn’s moon Enceladus.

We also learned that these minerals, formed when water evaporates, disappear when exposed to water once again – even with the tiny amount of water found in air. After studying some of the Bennu samples and their minerals, researchers stored the samples in air. That’s what we do with meteorites.

Unfortunately, we lost these minerals as moisture in the air on Earth caused them to dissolve. But that explains why we can’t find these minerals in meteorites that have been on Earth for decades to centuries.

Fortunately, most of the samples have been stored and transported in nitrogen, protected from traces of water in the air.

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Until scientists were able to conduct a controlled sample return with a spacecraft and carefully curate and store the samples in nitrogen, we had never seen this set of minerals in a meteorite.

An unexpected discovery

Before returning the samples, the OSIRIS-REx spacecraft spent over two years making observations around Bennu. From that two years of work, researchers learned that the surface of the asteroid is covered in rocky boulders.

We could see that the asteroid is rich in carbon and water-bearing clays, and we saw veins of white carbonate a few feet long deposited by ancient liquid water. But what we couldn’t see from these observations were the rarer minerals.

We used an array of techniques to go through the returned sample one tiny grain at a time. These included CT scanning, electron microscopy and X-ray diffraction, each of which allowed us to look at the rock at a scale not possible on the asteroid.

Cooking up the ingredients for life

From the salts we identified, we could infer the composition of the briny water from which they formed and see how it changed over time, becoming more sodium-rich.

This briny water would have been an ideal place for new chemical reactions to take place and for organic molecules to form.

While our team characterized salts, our organic chemist colleagues were busy identifying the carbon-based molecules present in Bennu. They found unexpectedly high levels of ammonia, an essential building block of the amino acids that form proteins in living matter. They also found all five of the nucleobases that make up part of DNA and RNA.

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Based on these results, we’d venture to guess that these briny pods of fluid would have been the perfect environments for increasingly complicated organic molecules to form, such as the kinds that make up life on Earth.

When asteroids like Bennu hit the young Earth, they could have provided a complete package of complex molecules and the ingredients essential to life, such as water, phosphate and ammonia. Together, these components could have seeded Earth’s initially barren landscape to produce a habitable world.

Without this early bombardment, perhaps when the pieces of the Revelstoke meteorite landed several billion years later, these fragments from outer space would not have arrived into a landscape punctuated with glaciers and trees.

Timothy J McCoy, Supervisory Research Geologist, Smithsonian Institution and Sara Russell, Professor of Planetary Sciences, Natural History Museum

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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In the late 19th century, America was buzzing with the thrill of innovation and exploration. However, amidst the technological advancements, an inexplicable phenomenon began to capture the imagination of many: mysterious airships sighted across the sky. This captivating mystery still puzzles historians and enthusiasts today, raising questions about whether they were mere figments of imagination, hoaxes, or something far more otherworldly.

The Birth of the Mystery

The saga of the mystery airships began in 1896 when reports of strange airships started to emerge from various locations in the United States. From California to Texas, witnesses described seeing cigar-shaped vessels flying through the night sky, illuminated by bright lights. Initial sightings created a flurry of excitement and speculation—newspapers quickly picked up the stories, printing illustrations and accounts that fueled the imaginations of readers.

Witness Accounts: Fact or Fiction?

Witnesses reported diverse descriptions of these airships. Some claimed the vessels hovered silently, while others insisted they produced loud noises that resembled the sounds of machinery or engines. People recounted instances of the airships being seen low enough to see their intricate details, leading many to ponder their origin.

One of the most famous sightings occurred in November 1896 when a newspaper reported that the airship was spotted over Sacramento, California. The pilot was said to have communicated with stunned citizens below, declaring his craft had been developed by a local inventor. Reports flooded in from other areas, each new sighting adding layers to the growing enigma.

Theories and Speculation

As excitement grew, so did the range of theories about the identity of the airships. Some suggested they were the result of secretive military testing, while others posited that they were experimental aircraft developed by inventors hoping to capitalize on the burgeoning aerospace industry. Conspiracy theories soon emerged, suggesting the airships were extraterrestrial craft, aliens visiting Earth long before modern UFO sightings became popular.

Another prevalent theory was that the airships were elaborate hoaxes created by pranksters or con artists. The media of the time jumped at the chance to sensationalize these stories, leading to speculation and possibly embellished accounts. Whether the sightings had factual bases in truth or were mere products of an imaginative society was a question many grappled with.

The Decline of the Phenomenon

By the turn of the century, reports of the mysterious airships began to wane. As the 20th century ushered in advancements in aviation technology, the public’s focus shifted toward real developments in flight, including the Wright brothers’ first powered flight in 1903. Interest in the mystery airships diminished, becoming a curious footnote in UFO and aviation history.

Legacy and Cultural Impact

Even today, the legacy of the mystery airships endures in popular culture. They have been the subjects of countless books, documentaries, and podcasts exploring the thin line between reality and imagination. The 1896 sightings continue to be cited in discussions about early UFOs, serving as a fascinating precursor to the modern fascination with unidentified flying objects.

As we unravel this historical enigma, we are reminded of humanity’s insatiable curiosity about the skies above. Whether rooted in fact or fictional fantasy, the mystery of the 1896 airships still invites exploration into the unexplained and provokes questions that resonate through time.

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Conclusion

The saga of the mystery airships remains an intriguing chapter in history, defined by a blend of fact, fiction, and speculation. It serves as a timeless reminder of our quest for understanding the inexplicable mysteries that surround us. As we look to the future, it’s essential to keep questioning, exploring, and pondering, for who knows what other secrets the skies may hold?

If you’re intrigued by the mystery of the 1896 airships or have your own theories, please share your thoughts in the comments below! ✈️✨

https://en.wikipedia.org/wiki/Mystery_airship

The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/

Ah, dolphins. The ocean’s golden retrievers. If the sea had a valedictorian, it would be a dolphin—wearing a tiny graduation cap, flipping its tail, and probably showing off by solving a Rubik’s Cube underwater. These marine marvels are the ultimate overachievers of the aquatic world, and frankly, they make the rest of us look bad.

Dolphins

First off, dolphins are ridiculously smart. Scientists say they’re second only to humans in intelligence, which is both impressive and mildly insulting. I mean, have you ever seen a dolphin try to assemble IKEA furniture? No, because they’re too busy inventing underwater sonar and teaching each other how to use sponges as tools. Meanwhile, I’m over here struggling to open a bag of chips without ripping it in half.

And let’s talk about their social lives. Dolphins are the ultimate extroverts. They travel in pods, which is basically the ocean’s version of a group chat that never stops buzzing. They’re always playing, gossiping, and probably roasting each other about who’s the slowest swimmer. They even have names for each other! Can you imagine? “Hey, Flipper, pass the seaweed!” “Nice one, Bubbles, but I’m busy teaching this octopus how to high-five.”

But here’s the kicker: dolphins are also pranksters. They’ve been known to blow bubbles and then swim through them like it’s some kind of underwater TikTok trend. They’ll also play catch with pufferfish, not because they’re hungry, but because the pufferfish release toxins that give them a little “buzz.” That’s right—dolphins are out here getting high on pufferfish while the rest of us are debating whether pineapple belongs on pizza.

And don’t even get me started on their acrobatics. Dolphins can leap 20 feet out of the water, spin in midair, and land gracefully like they’re auditioning for Dancing with the Stars: Ocean Edition. Meanwhile, I trip over my own feet walking to the fridge.

So, what’s the takeaway here? Dolphins are smarter, cooler, and more fun than most of us will ever be. They’re the ocean’s MVP, and honestly, they know it. But hey, at least we have thumbs, right? …Oh wait, they’ve probably figured out how to use those too by now.

Stay salty, my friends. And if you see a dolphin, just bow. They deserve it. 🐬

For further reading on dolphin research, check out these related links:

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https://royalsocietypublishing.org/doi/10.1098/rspb.2018.0948

https://www.wilddolphinproject.org/the-evolution-of-dolphin-research-embracing-new-technology/

https://manoa.hawaii.edu/news/article.php?aId=13420

The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/

STM Daily News is a multifaceted podcast that explores a wide range of topics, from life and consumer issues to the latest in food and beverage trends. Our discussions dive into the realms of science, covering everything from space and Earth to nature, artificial intelligence, and astronomy. We also celebrate the amateur sports scene, highlighting local athletes and events, including our special segment on senior Pickleball, where we report on the latest happenings in this exciting community. With our diverse content, STM Daily News aims to inform, entertain, and engage listeners, providing a comprehensive look at the issues that matter most in our daily lives. https://stories-this-moment.castos.com/