Connect with us

Science & Technology

Scientists document how space travel messes with the human brain

Published

on

Space can be an unfriendly place for the human body, with microgravity conditions and other factors tampering with our physiology, from head to toe – head, of course, being a primary concern.

A new NASA-funded study provides a deeper understanding of the issue. Researchers said on Thursday that astronauts who traveled on the International Space Station (ISS) or NASA space shuttles on missions lasting at least six months experienced significant expansion of the cerebral ventricles – spaces in the middle of the brain containing cerebrospinal fluid, Reuters reported.

This colorless and watery fluid flows in and around the brain and spinal cord. It cushions the brain to help protect against sudden impact and removes waste products.

Based on brain scans of 30 astronauts, the researchers found that it took three years for the ventricles to fully recover after such journeys, suggesting that an interval of at least that duration would be advisable between longer space missions.

“If the ventricles don’t have sufficient time to recover between back-to-back missions, this may impact the brain’s ability to cope with fluid shifts in microgravity. For example, if the ventricles are already enlarged from a previous mission, they may be less compliant and/or have less space to expand and accommodate fluid shifts during the next mission,” said University of Florida neuroscientist Heather McGregor, lead author of the study published in the journal Scientific Reports.

Age-related ventricular enlargement – caused not by microgravity but by brain atrophy – can be associated with cognitive decline.

“The impact of ventricular expansion in space travelers is not currently known. More long-term health follow-up is needed. This ventricular expansion likely compresses the surrounding brain tissue,” University of Florida applied physiology and kinesiology professor and study senior author Rachael Seidler said.

The absence of Earth’s gravity modifies the brain.

“This seems to be a mechanical effect,” Seidler said. “On Earth, our vascular systems have valves that prevent all of our fluids from pooling at our feet due to gravity. In microgravity, the opposite occurs – fluids shift toward the head. This headward fluid shift likely results in ventricular expansion, and the brain sits higher within the skull.”

The study involved 23 male and seven female astronauts – average age around 47 – from the U.S., Canadian and European space agencies. Eight traveled on space shuttle missions of about two weeks. Eighteen were on ISS missions of about six months and four on ISS missions of about a year.

Little to no ventricular volume change occurred in astronauts after short missions. Enlargement occurred in astronauts after missions of six months or longer, though there was no difference in those who flew for six months compared to those who did so for a year.

“This suggests that the majority of ventricle enlargement happens during the first six months in space, then begins to taper off around the one-year mark,” McGregor said.

The fact that enlargement did not worsen after six months could be good news for future Mars missions on which astronauts may spend two years in microgravity during the journey.

“This preliminary finding is promising for astronaut brain health during long-duration missions, but it’s still important that we examine MRI data from a larger group of astronauts and following even longer missions,” McGregor said.

The absence of enlargement following short flights was good news for people who may consider short space tourism jaunts, Seidler added, as that industry develops.

Microgravity conditions also cause other physiological effects due to the reduced physical load on the human body. These include bone and muscle atrophy, cardiovascular changes, issues with the balance system in the inner ear and a syndrome involving the eyes. Elevated cancer risk from the greater exposure to solar radiation that astronauts may encounter the further they travel from Earth is another concern.

Science & Technology

Russia plans a nuclear power plant on the moon within a decade

Published

on

Russia plans to put a nuclear power plant on the moon in the next decade to supply its lunar space programme and a joint Russian-Chinese research station, as major powers rush to explore the earth’s only natural satellite.

Ever since Soviet cosmonaut Yuri Gagarin became the first human to go into space in 1961, Russia has prided itself as a leading power in space exploration, but in recent decades it has fallen behind the United States and, increasingly, China, Reuters reported.

Russia’s ambitions suffered a massive blow in August 2023 when its unmanned Luna-25 mission smashed into the surface of the moon while attempting to land, and Elon Musk has revolutionised the launch of space vehicles – once a Russian speciality.

IS THAT A NUCLEAR REACTOR ON THE MOON?

Russia’s state space corporation, Roscosmos, said in a statement that it planned to build a lunar power plant by 2036 and signed a contract with the Lavochkin Association aerospace company to do it.

Roscosmos did not say explicitly that the plant would be nuclear but it said the participants included Russian state nuclear corporation Rosatom and the Kurchatov Institute, Russia’s leading nuclear research institute.

Roscosmos said the purpose of the plant was to power Russia’s lunar programme, including rovers, an observatory and the infrastructure of the joint Russian-Chinese International Lunar Research Station.

“The project is an important step towards the creation of a permanently functioning scientific lunar station and the transition from one-time missions to a long-term lunar exploration programme,” Roscosmos said.

The head of Roscosmos, Dmitry Bakanov, said in June that one of the corporation’s aims was to put a nuclear power plant on the moon and to explore Venus, known as earth’s “sister” planet.

The moon, which is 384,400 km (238,855 miles) from our planet, moderates the earth’s wobble on its axis, which ensures a more stable climate. It also causes tides in the world’s oceans.

U.S. ALSO PLANS A REACTOR ON THE MOON

Russia is not the only one with such plans. NASA in August declared its intent to put a nuclear reactor on the moon by the first quarter of fiscal year 2030.

“We’re in a race to the moon, in a race with China to the moon. And to have a base on the moon, we need energy,” U.S. Transport Secretary Sean Duffy said in August, when asked about the plans.

He added that the United States was currently behind in the race to the moon. He said energy was essential to allow life to be sustained on the moon and thence for humans to get to Mars.

International rules ban putting nuclear weapons in space but there are no bans on putting nuclear energy sources into space – as long as they comply with certain rules.

Some space analysts have predicted a lunar gold rush: NASA says there are estimates of a million tonnes of Helium-3, an isotope of helium that is rare on earth, on the moon.

Rare earth metals – used in smartphones, computers and advanced technologies – are also present on the moon, including scandium, yttrium and the 15 lanthanides, according to research by Boeing.

 

Continue Reading

Science & Technology

Australia social media ban set to take effect, sparking a global crackdown

For the social media businesses, the implementation marks a new era of structural stagnation as user numbers flatline and time spent on platforms shrinks, studies show.

Published

on

Australia is set to become the first country to implement a minimum age for social media use on Wednesday, with platforms like Instagram, TikTok and YouTube forced to block more than a million accounts, marking the beginning of an expected global wave of regulation.

From midnight, 10 of the biggest platforms will be required to block Australians aged under 16 or be fined up to A$49.5 million ($33 million), Reuters reported.

The law received harsh criticism from major technology companies and free speech advocates, but was praised by parents and child advocates.

The rollout closes out a year of speculation about whether a country can block children from using technology that is built into modern life. And it begins a live experiment that will be studied globally by lawmakers who want to intervene directly because they are frustrated by what they say is a tech industry that has been too slow to implement effective harm-minimisation efforts.

Governments from Denmark to Malaysia – and even some states in the U.S., where platforms are rolling back trust and safety features – say they plan similar steps, four years after a leak of internal Meta (META.O) documents showed the company knew its products contributed to body image problems and suicidal thoughts among teenagers while publicly denying the link existed.

“While Australia is the first to adopt such restrictions, it is unlikely to be the last,” said Tama Leaver, a professor of internet studies at Curtin University.

“Governments around the world are watching how the power of Big Tech was successfully taken on. The social media ban in Australia … is very much the canary in the coal mine.”

A spokesperson for the British government, which in July began forcing websites hosting pornographic content to block under-18 users, said it was “closely monitoring Australia’s approach to age restrictions.”

“When it comes to children’s safety, nothing is off the table,” they added.

Few will scrutinise the impact as closely as the Australians. The eSafety Commissioner, an Australian regulator tasked with enforcing the ban, hired Stanford University and 11 academics to analyse data on thousands of young Australians covered by the ban for at least two years.

Though the ban covers 10 platforms initially, including Alphabet’s (GOOGL.O), YouTube, Meta’s Instagram and TikTok, the government has said the list will change as new products appear and young users switch to alternatives.

Of the initial 10, all but Elon Musk’s X have said they will comply using age inference – guessing a person’s age from their online activity – or age estimation, which is usually based on a selfie. They might also check with uploaded identification documents or linked bank account details.

Musk has said the ban “seems like a backdoor way to control access to the internet by all Australians” and most platforms have complained that it violates people’s right to free speech.

For the social media businesses, the implementation marks a new era of structural stagnation as user numbers flatline and time spent on platforms shrinks, studies show.

Platforms say they don’t make much money showing advertisements to under-16s, but they add that the ban interrupts a pipeline of future users. Just before the ban took effect, 86% of Australians aged 8 to 15 used social media, the government said.

“The days of social media being seen as a platform for unbridled self-expression, I think, are coming to an end,” said Terry Flew, the co-director of University of Sydney’s Centre for AI, Trust and Governance.

Platforms responded to negative headlines and regulatory threats with measures like a minimum age of 13 and extra privacy features for teenagers, but “if that had been the structure of social media in the boom period, I don’t think we’d be having this debate,” he added.

Continue Reading

Science & Technology

Ethiopian volcano erupts for first time in nearly 12,000 years

Ash from the eruption drifted across the region, spreading over Yemen, Oman, India, and parts of Pakistan.

Published

on

The Hayli Gubbi volcano in Ethiopia’s Afar region has erupted for the first time in almost 12,000 years, sending massive ash plumes soaring up to 14 kilometres into the atmosphere, according to the Toulouse Volcanic Ash Advisory Centre.

The eruption began on Sunday and lasted several hours. Hayli Gubbi, located around 800 kilometres northeast of Addis Ababa near the Eritrean border, sits within the geologically active Rift Valley, where two major tectonic plates meet. The volcano rises roughly 500 metres above the surrounding landscape.

Ash from the eruption drifted across the region, spreading over Yemen, Oman, India, and parts of Pakistan. Satellite imagery and social-media videos captured a towering column of white smoke billowing into the sky.

The Smithsonian Institution’s Global Volcanism Program notes that Hayli Gubbi has no recorded eruptions during the Holocene, the period dating back about 12,000 years to the end of the last Ice Age.

Volcanologist Simon Carn of Michigan Technological University also confirmed on Bluesky that the volcano had “no record of Holocene eruptions.”

Continue Reading
Advertisement
Advertisement
Advertisement
Advertisement

Trending

Copyright © 2025 Ariana News. All rights reserved!