Connect with us

Technology

Meteorite impacts identified as driver of moon’s tenuous atmosphere | The Express Tribune

Published

on



PASADENA, CALIF:

The NASA astronauts who became the first people to land on the moon’s surface in the 1960s and 1970s also discovered a previously unknown lunar characteristic – it has an atmosphere, though quite tenuous. Soil samples they retrieved are now revealing the main physical process driving this atmosphere.

By analyzing which forms of two elements – potassium and rubidium – were present in nine tiny soil samples from five Apollo missions, researchers determined that the lunar atmosphere was created and is sustained primarily by the effects of meteorites, large and small, striking the moon’s surface.

“Meteorite impacts generate high temperatures ranging from 2,000-6,000 degrees Celsius (3,600-10,800 degrees Fahrenheit). These extreme temperatures melt and vaporize rocks on the lunar surface, similar to how heat vaporizes water, releasing atoms into the atmosphere,” said Massachusetts Institute of Technology planetary scientist and cosmochemist Nicole Nie, lead author of the study published on Friday in the journal Science Advances, opens new tab.

The lunar atmosphere is extremely thin and technically classified as an exosphere, meaning atoms do not collide with each other because their numbers are so sparse, in contrast to Earth’s thick and stable atmosphere.

“The Apollo missions carried instruments to the lunar surface which detected atoms in the air,” Nie said.

In 2013, NASA sent the robotic LADEE (Lunar Atmosphere and Dust Environment Explorer) spacecraft to orbit the moon to study its atmosphere and surface environment. It identified two processes, known as space weathering, at work – the meteorite impacts and a phenomenon called solar wind sputtering.

“Solar winds carry high-energy charged particles, primarily protons, through space. When these particles impact the moon, they transfer their energy to lunar surface atoms, causing them to be ejected from the surface,” Nie said.

LADEE did not determine the relative contributions of these two processes to the lunar atmosphere. The new study showed that impacts account for more than 70% of its composition, while solar wind sputtering contributes less than 30%.

The moon has been constantly bombarded by meteorites – early in its history by large ones that gashed the gaping craters visible on the lunar surface and more recently by smaller ones including dust-sized micrometeorites. Some of the atoms lofted by these impacts fly off into space. The rest remain suspended above the surface in an atmosphere regularly replenished as more meteorites land.

The lunar atmosphere contains mainly argon, helium and neon, along with potassium and rubidium and possibly other elements at lesser levels. It extends from the moon’s surface to a height of about 62 miles (100 km). Earth’s atmosphere extends to approximately 6,200 miles (10,000 km).

Instead of investigating the actual atoms in the lunar atmosphere, the researchers used lunar soil, called regolith, as a proxy. They used an instrument called a mass spectrometer to examine the ratio of different isotopes of potassium and rubidium in the soil. Isotopes are atoms of the same element with slightly different masses because of differing numbers of subatomic particles called neutrons.

“This is possible because the lunar surface soil is interacting with the exosphere since the formation of the moon, and the different processes leave distinct imprints on the isotopic composition of the lunar soil,” said planetary scientist and study co-author Timo Hopp of the Max Planck Institute for Solar System Research in Germany.

Three isotopes of potassium and two isotopes of rubidium exist.

After decades of studying the moon, scientists are still learning about some of its basic processes.

“Many important questions about the lunar atmosphere remain unanswered. We are now able to address some of these questions due to advancements in technology,” Nie said. “When Apollo samples were returned from the moon in the 1970s, the isotopic compositions of potassium and rubidium in lunar soils were measured using mass spectrometers. However, at that time, no isotopic differences were observed. Today’s mass spectrometers offer much greater precision.”

Continue Reading
Click to comment

Leave a Reply

آپ کا ای میل ایڈریس شائع نہیں کیا جائے گا۔ ضروری خانوں کو * سے نشان زد کیا گیا ہے

Technology

SpaceX achieves unprecedented feat in commercial space travel | The Express Tribune

Published

on

By



WASHINGTON:

Two astronauts, a billionaire and an engineer, completed the first private spacewalk in orbit on Thursday outside a SpaceX capsule. They wore a new type of spacesuit in a high-risk feat once limited to astronauts from government space agencies.

As part of the Polaris Dawn mission, the astronauts each spent about 10 minutes outside the Crew Dragon capsule, tethered for safety, while their two crewmates remained inside. The mission, led by Elon Musk’s SpaceX, further pushed the boundaries of private space travel.

Jared Isaacman, a pilot and founder of Shift4, was the first to exit, followed by SpaceX engineer Sarah Gillis. Meanwhile, their crewmates Scott Poteet and Anna Menon observed from inside the capsule. Orbiting about 450 miles (730 km) above Earth, the entire spacewalk lasted one hour and 46 minutes.

Isaacman, who also funded the Polaris mission, previously financed his Inspiration4 flight with SpaceX in 2021. The mission, streamed live on SpaceX’s website, tested new equipment, including slimmer spacesuits and a procedure to fully depressurise the Crew Dragon cabin – technology that Musk aims to refine for future private missions to Mars.

After re-entering the spacecraft, Isaacman commented on Earth’s beauty, as seen from space. This mission was one of the riskiest for SpaceX, the only private company capable of regularly sending people into orbit and back.

Before the spacewalk at around 10:52 GMT, the capsule was completely depressurised, with the astronauts relying on their SpaceX-designed spacesuits for oxygen via an umbilical connection to the capsule. Isaacman, 41, and Gillis, 30, tested the suits’ flexibility and provided feedback to improve future designs.

The mission aimed to push the limits of private companies in space, with ground teams at SpaceX’s California headquarters monitoring the hatch’s closure and carrying out safety checks as the astronauts returned inside.

The spacewalk procedure echoed that of the first US spacewalk in 1965, which involved depressurising the capsule and tethering a spacesuited astronaut to it. NASA Administrator Bill Nelson hailed the mission as a “giant leap forward” for the commercial space industry and NASA’s goal of building a sustainable US space economy.

While Isaacman has not revealed the mission’s cost, it is expected to run into hundreds of millions, with Crew Dragon seats typically costing around $55 million each.

Gillis, who joined SpaceX as an intern in 2015, and Poteet, a retired US Air Force lieutenant colonel, were among the crew, along with SpaceX engineer Anna Menon. Throughout the mission, the spacecraft circled Earth multiple times, reaching altitudes of up to 1,400 km, the farthest humans have travelled in space since Apollo’s final mission in 1972.

Spacewalks have previously been conducted solely by government-trained astronauts. Since the International Space Station (ISS) was established in 2000, there have been around 270 spacewalks, with 16 on China’s Tiangong space station.

The Polaris crew spent two and a half years training, including mission simulations and challenging real-world experiences, to prepare for the mission, according to Poteet.

Currently, a record 19 astronauts are in orbit, including 12 aboard the ISS, after a Russian Soyuz mission transported additional astronauts there on Wednesday. Since 2001, Crew Dragon has completed more than a dozen astronaut missions, primarily for NASA.

The capsule was developed under a NASA programme to create commercial vehicles for transporting astronauts to and from the ISS. Boeing’s Starliner capsule, also part of this programme, launched its first astronauts to the ISS in June but faced difficulties. It returned empty, leaving its crew aboard the station until next year, when a Crew Dragon capsule will retrieve them.

Continue Reading

Technology

PS5 Disc Drive is selling out after PS5 Pro announcement | The Express Tribune

Published

on

By


Listen to article

The demand for the PS5 Disc Drive has skyrocketed since the announcement of the PS5 Pro, with online retailers quickly selling out of the popular peripheral.

Gamers eager to ensure they can still play physical media on their next-gen consoles are rushing to purchase the external disc drive required for the new PS5 Pro.

Sony officially revealed the PS5 Pro earlier this week, and with it came the announcement that the console would not include a built-in disc drive.

Instead, players who want to use physical discs will need to buy the external PS5 Disc Drive, a shift that has already sparked a buying frenzy.

At the time of writing, the PS5 Disc Drive has climbed to #16 on Amazon’s best-selling video game products.

Best Buy, one of the major online retailers, has already sold out of the drive, and it is currently unavailable for order. Gamers are still able to find it on other major sites like Target, Walmart, and PlayStation Direct, but these supplies are expected to diminish quickly as well.

This rush to secure the PS5 Disc Drive began when Sony introduced the PS5 Slim in late 2023, which also required an external drive for physical game compatibility. Unlike the original PS5, which featured both disc and digital editions, the Slim removed the option of having a built-in disc drive.

 

 

Continue Reading

Technology

US wireless data usage surges to record 100 trillion MB in 2023 | The Express Tribune

Published

on

By


Americans consumed more than 100 trillion megabytes of wireless data in 2023, a 36% rise from the previous year and the largest single-year increase, according to a report from wireless industry association CTIA.

The surge in usage—an increase of 26 trillion MB over 2022—is attributed to the growing adoption of 5G devices and fixed wireless access (FWA) broadband services.

The total number of wireless connections in the US rose to 558 million, representing a 6% growth over 2022. Notably, 40% of wireless connections were 5G-enabled, covering over 330 million US residents.

Additionally, nearly 40% of all wireless devices were connected to 5G, a 34% increase from 2022.

CTIA highlighted that the sector attracted $30 billion in investment in 2023, with total spending on spectrum auctions surpassing $233 billion.

However, the association emphasized the need for Congress to restore the Federal Communications Commission’s (FCC) auction authority to ensure access to mid-band spectrum and meet the growing demand for wireless services.

By the end of 2023, the US had 432,469 active cell sites, a 24% increase since 2018, thanks to siting reforms.

The cost per megabyte of wireless data has dropped by 50% since 2020.

CTIA’s annual survey has tracked the US wireless sector since 1985.

Continue Reading

Technology

Black Sun Productions to launch VR game inspired by Kafka’s Metamorphosis | The Express Tribune

Published

on

By


Listen to article

Black Sun Productions, a virtual reality studio, has announced its debut title, Metamorphosis VR, will launch on October 10, 2024.

The narrative inspired by Franz Kafka’s The Metamorphosis will be available for Meta Quest 2 and 3.

This VR game offers a unique and immersive experience, allowing players to step into the surreal world of Kafka’s renowned novella.

Metamorphosis VR is a bold reimagining of the 2020 PC game Metamorphosis, originally developed by Ovid Works and Untold Tales.

The story takes place in early 1900s Vienna, following Gregor Samsa, a traveling salesman who undergoes a shocking transformation into a cockroach.

After a night out, Gregor awakens to discover his metamorphosis and embarks on a strange journey to find a way to return to his human form and save his closest friend.

“We chose Metamorphosis as our debut title for Black Sun because its surreal, Kafkaesque world – some of the richest and most immersive environments imagined – offers a perfect opportunity to bring this extraordinary experience to virtual reality,” said Corbin Chase, CEO of Black Sun Productions, in a statement, as reported by VentureBeat.

“One of VR’s most powerful abilities is how it changes our perspective and sense of scale, and Metamorphosis uniquely combines confusion, bewilderment, wonder and beauty. All imparted by that shift in perspective, it feels like this game was always meant for VR.”

One of the game’s key highlights is its distinct shift in perspective, which allows players to experience Gregor’s new reality as an insect.

Navigating through walls, floorboards, and tight spaces, the player is immersed in a bizarre world filled with bug philosophers, insect crime bosses, and creepy thespians.

The game features over 100 insect characters, each with a unique voice, contributing to an interactive experience.

Fans of Kafka’s original novella and virtual reality enthusiasts eager to explore its surreal world are anticipating the game’s October 10 release on Meta Quest 2 and 3.

 

Continue Reading

Trending