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Space tourism’s growth blurs the line between scientific and symbolic achievement – a tourism scholar explains how

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Space tourism’s growth blurs the line between scientific and symbolic achievement – a tourism scholar explains how

file 20250513 56 2vu1r5.jpg?ixlib=rb 4.1
Blue Origin’s NS-31 flight lifted off on April 14, 2025.
Justin Hamel/Getty Images

Betsy Pudliner, University of Wisconsin-Stout

On April 14, 2025, Blue Origin launched six women – Aisha Bowe, Amanda Nguyễn, Gayle King, Katy Perry, Kerianne Flynn and Lauren Sánchez – on a suborbital journey to the edge of space.

The headlines called it a historic moment for women in space. But as a tourism educator, I paused – not because I questioned their experience, but because I questioned the language. Were they astronauts or space tourists? The distinction matters – not just for accuracy, but for understanding how experience, symbolism and motivation shape travel today.

In tourism studies, my colleagues and I often ask what motivates travel and makes it a meaningful experience. These women crossed a boundary by leaving Earth’s surface. But they also stepped into a controversy about a symbolic one: the blurred line between astronaut and tourist, between scientific achievement and curated experience.

This flight wasn’t just about the altitude they flew to – it was about what it meant. As commercial space travel becomes more accessible to civilians, more people are joining spaceflights not as scientists or mission specialists, but as invited guests or paying participants. The line between astronaut and space tourist is becoming increasingly blurred.

Blue Origin’s NS-31 flight brought six women to the edge of space.

In my own work, I explore how travelers find meaning in the way their journeys are framed. A tourism studies perspective can help unpack how experiences like the Blue Origin flight are designed, marketed and ultimately understood by travelers and the tourism industry.

So, were these passengers astronauts? Not in the traditional sense. They weren’t selected through NASA’s rigorous training protocols, nor were they conducting research or exploration in orbit.

Instead, they belong to a new category: space tourists. These are participants in a crafted, symbolic journey that reflects how commercial spaceflight is redefining what it means to go to space.

Space tourism as a niche market

Space tourism has its origins in 1986 with the launch of the Mir space station, which later became the first orbital platform to host nonprofessional astronauts. In the 1990s and early 2000s, Mir and its successor, the International Space Station, welcomed a handful of privately funded civilian guests – most notably U.S. businessman Dennis Tito in 2001, often cited as the first space tourist.

Space tourism has since evolved into a niche market selling brief encounters to the edge of Earth’s atmosphere. While passengers on the NS-31 flight did not purchase their seats, the experience mirrors those sold by commercial space tourism providers such as Virgin Galactic.

Like other forms of niche tourism – wellness retreats, heritage trails or extreme adventures – space travel appeals to those drawn to novelty, exclusivity and status, regardless of whether they purchased the ticket.

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These suborbital flights may last just minutes, but they offer something far more lasting: prestige, personal storytelling and the feeling of participating in something rare. Space tourism sells the experience of being somewhere few have visited, not the destination itself. For many, even a 10-minute flight can fulfill a deeply personal milestone.

Tourist motivation and space tourism’s evolution

The push-and-pull theory in tourism studies helps explain why people might want to pursue space travel. Push factors – internal desires such as curiosity, an urge to escape or an eagerness to gain fame – spark interest. Pull factors – external elements such as wishing to see the view of Earth from above or experience the sensation of weightlessness – enhance the appeal.

Space tourism taps into both. It’s fueled by the internal drive to do something extraordinary and the external attraction of a highly choreographed, emotional experience.

Three men -- including Jeff Bezos in a cowboy hat -- wear blue jumpsuits and sit in front of a model crew capsule labeled 'Blue Origin.'
Participants in space tourism wear branded jumpsuits with the company’s logo, pose for photos and talk to the media about their experience.
AP Photo/Tony Gutierrez

These flights are often branded – not necessarily with flashy logos, but through storytelling and design choices that make the experience feel iconic. For example, while the New Shepard rocket the women traveled in doesn’t carry a separate emblem, it features the company’s name, Blue Origin, in bold letters along the side. Passengers wear personalized flight suits, pose for preflight photos and receive mission patches or certificates, all designed to echo the rituals of professional space missions.

What’s being sold is an “astronaut-for-a-day” experience: emotionally powerful, visually compelling and rich with symbolism. But under tourism classifications, these travelers are space tourists – participants in a curated, short-duration excursion.

Representation and marketing experience

The image from the Blue Origin flight of six women boarding a rocket was framed as a symbolic victory – a girl-power moment designed for visibility and celebration – but it was also carefully curated.

This wasn’t the first time women entered space. Since its inception, NASA has selected 61 women as astronaut candidates, many of them making groundbreaking contributions to space science and exploration. Sally Ride, Mae Jemison, Christina Koch and Jessica Meir not only entered space – they trained as astronauts and contributed significantly to science, engineering and long-duration missions. Their journeys marked historic achievements in space exploration rather than curated moments in tourism.

Recognizing their legacy is important as commercial spaceflight creates new kinds of unique, tailored experiences, ones shaped more by media performance than by scientific milestones.

The Blue Origin flight was not a scientific mission but rather was framed as a symbolic event. In tourism, companies, marketers and media outlets often create these performances to maximize their visibility. SpaceX has taken a similar approach with its Inspiration4 mission, turning a private orbital flight into a global media event complete with a Netflix documentary and emotional storytelling.

The Blue Origin flight sold a feeling of progress while blending the roles between astronaut and guest. For Blue Origin, the symbolic value was significant. By launching the first all-female crew into suborbital space, the company was able to claim a historic milestone – one that aligned them with inclusion – without the cost, complexity or risk associated with a scientific mission. In doing so, they generated enormous media attention.

Tourism education and media literacy

In today’s world, space travel is all about the story that gets told about the flight. From curated visuals to social media posts and press coverage, much of the experience’s meaning is shaped by marketing and media.

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Understanding that process matters – not just for scholars or industry insiders, but for members of the public, who follow these trips through the narratives produced by the companies’ marketing teams and media outlets.

Another theory in tourism studies describes how destinations evolve over time – from exploration, to development, to mass adoption. Many forms of tourism begin in an exploration phase, accessible only to the wealthy or well connected. For example, the Grand Tour of Europe was once a rite of passage for aristocrats. Its legacy helped shape and develop modern travel.

A graph showing time on the x axis and number of tourists on the y, with a curved line where tourists go up over time.
As more people travel to a destination over time, it moves through the tourism area life cycle. During the early exploration phase, the destination has only a few tourists.
Coba56/Wikimedia Commons

Right now, space tourism is in the exploration stage. It’s expensive, exclusive and available only to a few. There’s limited infrastructure to support it, and companies are still experimenting with what the experience should look like. This isn’t mass tourism yet, it’s more like a high-profile playground for early adopters, drawing media attention and curiosity with every launch.

Advances in technology, economic shifts and changing cultural norms can increase access to unique destinations that start as out of bounds to a majority of tourists. Space tourism could be the next to evolve this way in the tourism industry. How it’s framed now – who gets to go, how the participants are labeled and how their stories are told – will set the tone moving forward. Understanding these trips helps people see how society packages and sells an inspirational experience long before most people can afford to join the journey.

Betsy Pudliner, Associate Professor of Hospitality and Technology Innovation, University of Wisconsin-Stout

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

The Earth

Cement has a climate problem — here’s how geopolymers with add‑ins like cork could help fix it

Portland cement drives ~8% of global emissions. Learn how low-carbon geopolymers—enhanced with add-ins like cork—could cut concrete’s footprint.

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file 20260208 56 zgr72e.jpg?ixlib=rb 4.1
Portland cement, widely used for concrete, is responsible for about 8% of global greenhouse gas emissions. Photovs/iStock/Getty Images Plus

Alcina Johnson Sudagar, Washington University in St. Louis

Concrete is all around you – in the foundation of your home, the bridges you drive over, the sidewalks and buildings of cities. It is often described as the second-most used material by volume on Earth after water.

But the way concrete is made today also makes it a major contributor to climate change.

Portland cement, the key component of concrete, is responsible for about 8% of global greenhouse gas emissions. That’s because it’s made by heating limestone to high temperatures, a process that burns a large amount of fossil fuels for energy and releases carbon dioxide from the limestone in the process.

The good news is that there are alternatives, and they are gaining attention.

Portland cement: A greenhouse gas problem

Cementlike substances have been used in construction for thousands of years. Architects have found evidence of their use in the pyramids of Egypt and the buildings and aqueducts of the Roman Empire.

The Portland cement commonly used in construction today was patented in 1824 by Joseph Aspdin, a British bricklayer.

Modern cement preparation starts with crushing the excavated raw materials limestone and clay and then heating them in a kiln at around 2,650 degrees Fahrenheit (about 1,450 degrees Celsius) to form clinker, a hard, rocklike residue. The clinker is then cooled and ground with gypsum into a fine powder, which is called cement.

About 40% of the carbon dioxide emissions from cement production come from burning fossil fuels to generate the high heat needed to run the kiln. The rest come as the heat converts limestone (calcium carbonate) to lime (calcium oxide), releasing carbon dioxide.

In all, between half a ton and 1 ton of greenhouse gas is released per ton of Portland cement. Cement is a binding agent that, mixed with water, holds aggregate together to create concrete. It makes up about 10% to 15% of the concrete mix by weight.

Alternative technologies can lower emissions

As populations, cities and the need for new infrastructure expand, the use of cement is growing, making it important to find alternatives with lower environmental costs.

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Concrete has seen the fastest growth among commonly used construction materials with rising population between 1950 and 2023
As population has increased, annual global Portland cement production has risen with it. Hao Chen, et al., 2025, CC BY-NC-ND

Some techniques for reducing carbon dioxide emissions include substituting some of the clinker – the hard residue typically made from limestone – with supplementary materials such as clay, or fly ash and slag from industries. Other methods reduce the amount of cement by mixing in waste sawdust or recycled materials like plastics.

The long-term solution for reducing cement’s emissions, however, is to replace traditional cement completely with alternatives. One option is geopolymers made from earthen clay and industrial wastes.

Geopolymers: A more climate-friendly solution

Geopolymers can be made by mixing claylike materials that are rich in aluminum and silicon minerals with a chemical activator through a process called geopolymerization. The activator transforms the silicon and aluminum into a structure that will look like cement. All of this can happen at room temperature.

The major difference between cement and geopolymer is that cement is mainly made of calcium, whereas geopolymers are made of silicon and aluminum with some possible calcium in their structure.

Geopolymers offer advantages with lower number of steps, lower CO2 emission and lower water requirement over Portland cement
How the production of Portland cement and geopolymers compare. Alcina Johnson Sudagar, CC BY-NC

These geopolymers have been found to possess high strength and durability, including resilience in freeze-thaw cycles and resistance to heat and fire, which are important requirements in construction. Studies have found that some geopolymers can provide comparable if not better strength than traditional cement and, because they don’t require heat the way clinker does, they can be produced with significantly lower greenhouse gas emissions.

Geopolymers can also be produced from a variety of raw materials rich in aluminum and silicon, including earthen clays, fly ash, blast furnace slag, rice husk ash, iron ore wastes and recycled construction brick waste. Geopolymer technology can be adapted depending on the clay or industrial waste locally available in a region. https://www.youtube.com/embed/NOj3p6m9M7Q?wmode=transparent&start=0 A brief history of cement and geopolymers. Geopolymer International.

An added advantage of geopolymers is that changes to the mixture can produce a range of features.

For example, I and my co-researchers at the University of Aveiro in Portugal added a small amount of cork industry waste – the leftovers from creating bottle corks – to clay-based geopolymer and found it could improve the strength of the material by up to twofold. The cork particles filled the spaces in the geopolymer structure, making it denser, which increased the strength.

Similarly, additives such as sisal fibers from the agave plant, recycled plastic and steel fibers can change geopolymer properties. The additives do not participate in the geopolymerization process but act as fillers in the structure.

The structure of geopolymers can also be designed to act as adsorbents, attracting toxic metals in wastewater and capturing and storing radioactive wastes. Specifically, incorporating materials like zeolite that are natural adsorbents in the geopolymer structure can make them useful for such applications as well.

Where geopolymers are used now

Geopolymers have been used in many types of construction, including roads, coatings, 3D printing, coastal environmental protection, the steel and chemical industries, sewer rehabilitation and building radiation shielding and rocket launchpad and bunker infrastructure.

One of the earliest examples of a modern geopolymer concrete project was the Brisbane West Wellcamp airport in Australia.

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It was built in 2014 with 70,000 metric tons of geopolymer concrete, which was estimated to have reduced the project’s carbon dioxide emissions by as much as 80%.

The geopolymer market is currently estimated to be between US$7 billion and $10 billion, with the largest growth in the Asia-Pacific region.

Analysts have estimated that the market could grow at a rate of 10% to 20% per year and reach about $62 billion by 2033.

In several countries, greenhouse gas regulations and green-building certifications are expected to support the continued growth of geopolymers in the construction industry.

Expanding the use of cement alternatives

The advantage of using industrial wastes in geopolymers is a double-edged sword, however. The composition of industrial wastes varies, so it can be difficult to standardize the processing methods. The geopolymer components need to be mixed in particular ratios to achieve desired properties.

Producing the activator for the geopolymer, typically done in chemical facilities, can raise the cost and contribute to the carbon footprint. And the long-term data about these materials’ stability is only now being developed given their newness. Also, these geopolymers can take longer to set than cement, though the setting time can be sped up by using raw materials that react quickly.

Developing cheaper, naturally available activators like agricultural waste rice husk with sustainable supply chains could help lower the costs and environmental impact. Also, printing the recipe on the raw material packaging could help simplify the job of determining the mixing ratio so geopolymers can be more widely used with confidence.

Even though geopolymer technology has some drawbacks, these low-carbon alternatives have great potential for reducing emissions from the construction sector.

Alcina Johnson Sudagar, Research Scientist in Chemistry, Washington University in St. Louis

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

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Science

Sonic booms from meteors can release the energy of hundreds of tons of TNT – here’s how they work

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Sonic booms from meteors can release the energy of hundreds of tons of TNT – here’s how they work
The Chelyabinsk asteroid left a vapor trail as it hit the Earth’s atmosphere in 2013. M. Ahmetvaleev/European Space Agency

Shawn Laatsch, University of Maine

Sonic booms from meteors can release the energy of hundreds of tons of TNT – here’s how they work

As humans, we live out our lives on a planet that is constantly sweeping through a cosmic ocean littered with ancient debris from the formation of the solar system. For the most part, our world glides silently through space, shielded by Earth’s thin atmosphere.

Occasionally, however, the rest of the universe reminds us of its presence with stunning, visceral clarity.

Residents along the Massachusetts–New Hampshire border were startled by a sudden sonic boom on the afternoon of May 30, 2026. A large number of people up and down the Eastern Seaboard witnessed it.

After NASA analyzed imagery from weather satellites, they identified the culprit as a small meteor measuring roughly 3 to 5 feet (1 to 2 meters) across. It was screaming through space at an astonishing 42,000 miles per hour (68,000 kilometers per hour) when it plunged into Earth’s upper atmosphere.

Fragments from a meteor fell into Cape Cod Bay in May 2026.

Friction between the meteor and the increasingly dense air quickly turned the kinetic energy of the rock shooting through the sky into blistering heat. At an altitude of roughly 40 miles (60 kilometers), the immense heat and pressure overcame the structural integrity of the meteor, causing it to fragment in a brilliant flash.

The breakup released a staggering burst of energy equivalent to 300 tons of TNT. When an object travels through the air at speeds faster than sound, which is 761 mph (1,225 kph), it creates a shock wave creating a thunderous clap, or sonic boom. While the majority of the rock vaporized, the remaining fragments rained down harmlessly into the waters of Cape Cod Bay.

In the past, such an event might have passed as an unverified sighting in the daytime sky. Today, however, our planet is wired with an accidental network of planetary defense sensors: dashboard cameras, security systems and digital doorbells.

Because meteor entries like this one last only a few fleeting seconds, they were easily missed in the past. Now, our collective digital eyes capture these spontaneous cosmic intrusions almost instantly, bringing the universe directly into our daily news feeds. While dramatic, these events are more common than most people imagine.

As someone who has worked as a planetarium director and astronomy educator for over four decades, I often get emails, social media messages and phone calls about such objects and sightings. While hearing a sonic boom can be a bit unsettling or even shocking, it reminds us we live in an active universe and may want to occasionally look up instead of down at our devices.

A meteoric spring

The Cape Cod fireball was the latest sighting in an active season of meteoritic arrivals. Just months earlier, the solar system seemed to be sending a parade of rocky objects down to Earth.

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From March 8-11, observers in Northern Europe witnessed large, slow-moving fireballs in their skies. Enthusiasts and scientists successfully recovered several fragments. Lab analysis of these specimens revealed their place in a fascinating lineage – scientists determined that they had originated from Vesta, a massive, pristine asteroid orbiting between Mars and Jupiter.

On March 17, a 7-ton asteroid measuring roughly 6 feet across entered the atmosphere directly over Lake Erie. Traveling at 45,000 mph (72,400 kph), it generated a brilliant daytime flash and a powerful sonic boom, unloading an energy equivalent to 250 tons of TNT. NASA scientists published data about its trajectory, allowing meteorite hunters to recover pristine fragments in Valley City, just a short drive from Cleveland, Ohio.

Only four days later, on March 21, another cosmic fragment blazed across the skies of Texas. This object was about 3 feet wide, and it traveled at 35,000 mph (56,300 kph), releasing the energy of roughly 26 tons of TNT.

Outside of Houston, homeowner Sherri James was startled by a sudden crash, only to discover a 6-inch (15-cm) hole in her roof and a small piece of the solar system resting on her floor.

Thank goodness for Earth’s atmospheric shield

The benchmark for modern atmospheric impacts is the Chelyabinsk meteor, which exploded over Russia on Feb. 15, 2013.

That object was significantly larger than any of the meteors researchers have observed in 2026, measuring 60 feet (18 m) across and weighing roughly 10,000 tons. When it shattered 18 miles (29 km) above the ground, it produced an airburst with an explosive force 30 times greater than the Hiroshima atomic bomb.

A gif of a bright streak moving across the sky and growing brighter towards the end of its journey
The Chelyabinsk meteor, the largest observed in modern history, shoots through the sky in February 2013. Aleksandr Ivanov/Wikimedia Commons, CC BY

The resulting shock wave shattered glass across hundreds of square miles, injuring nearly 1,500 people and registering as a seismic event between 2.7 and 3.7 on the Richter scale. The incident was a stark reminder that while Earth’s atmosphere is an incredibly effective shield, absorbing the lion’s share of cosmic impacts, a large enough kinetic punch can still reach the surface below.

Despite the dramatic stories around these meteor impacts, history shows that the cosmic lottery rarely targets humans directly. In all of recorded history, there is only one universally confirmed case of a person being directly struck by a space rock.

In 1954, an 8.5-pound (3.8 kg) meteorite crashed through the roof of a house in Sylacauga, Alabama, ricocheted off a heavy wooden radio and struck a sleeping woman named Ann Hodges. Though it left a severe bruise on her hip, the radio absorbed the brunt of the impact. Had it not been for the radio, there is a chance she could have been seriously injured or killed by this object.

Living with the cosmos

So, are you in any imminent danger from meteors? The mathematics of the cosmos provide profound reassurance. The statistical odds of being struck by a meteorite are vanishingly small. You stand a better chance of winning a multimillion-dollar lottery jackpot 10 times in a row than ever being hit by a meteorite.

The vast majority of the tons of space debris that bombard Earth daily arrive as harmless dust grains, burning up as elegant meteors or shooting stars. But when the larger pieces do break through and land on our planet, they offer a rare, tangible connection to the beginning of the solar system.

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If you ever happen to witness one of these magnificent fireballs ripping open the sky, consider reporting your observation to the American Meteor Society. The organization keeps track of sightings and falls from around the globe. Recovered fragments provide a way for scientists to gain valuable information about the origin of our solar system, and of our home planet.

Shawn Laatsch, Director of the Versant Power Astronomy Center, University of Maine

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

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Forgotten Genius Fridays

Valerie Thomas: NASA Engineer, Inventor, and STEM Trailblazer

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Last Updated on June 12, 2026 by Rod WashingtonValerie Thomas

Valerie Thomas is a true pioneer in the world of science and technology. A NASA engineer and physicist, she is best known for inventing the illusion transmitter, a groundbreaking device that creates 3D images using concave mirrors. This invention laid the foundation for modern 3D imaging and virtual reality technologies.

Beyond her inventions, Thomas broke barriers as an African American woman in STEM, mentoring countless young scientists and advocating for diversity in science and engineering. Her work at NASA’s Goddard Space Flight Center helped advance satellite technology and data visualization, making her contributions both innovative and enduring.

In our latest short video, we highlight Valerie Thomas’ remarkable journey—from her early passion for science to her groundbreaking work at NASA. Watch and be inspired by a true STEM pioneer whose legacy continues to shape the future of space and technology.

🎥 Watch the video here: https://youtu.be/P5XTgpcAoHw

Dive into “The Knowledge,” where curiosity meets clarity. This playlist, in collaboration with STMDailyNews.com, is designed for viewers who value historical accuracy and insightful learning. Our short videos, ranging from 30 seconds to a minute and a half, make complex subjects easy to grasp in no time. Covering everything from historical events to contemporary processes and entertainment, “The Knowledge” bridges the past with the present. In a world where information is abundant yet often misused, our series aims to guide you through the noise, preserving vital knowledge and truths that shape our lives today. Perfect for curious minds eager to discover the ‘why’ and ‘how’ of everything around us. Subscribe and join in as we explore the facts that matter.  https://stmdailynews.com/the-knowledge/

Forgotten Genius Friday: The Enduring Legacy of Elijah McCoy — Is he the Man Behind “The Real McCoy?”

Forgotten Genius Fridays

https://stmdailynews.com/the-knowledge-2/forgotten-genius-fridays/

🧠 Forgotten Genius Fridays

A Short-Form Series from The Knowledge by STM Daily News

Every Friday, STM Daily News shines a light on brilliant minds history overlooked.

Forgotten Genius Fridays is a weekly collection of short videos and articles dedicated to inventors, innovators, scientists, and creators whose impact changed the world—but whose names were often left out of the textbooks.

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From life-saving inventions and cultural breakthroughs to game-changing ideas buried by bias, our series digs up the truth behind the minds that mattered.

Each episode of The Knowledge runs 30–90 seconds, designed for curious minds on the go—perfect for YouTube Shorts, TikTok, Reels, and quick reads.

Because remembering these stories isn’t just about the past—it’s about restoring credit where it’s long overdue.

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