Connect with us

Published

on

Since time immemorial, humans around the world have gazed up in wonder at the night sky. The starry night sky has not only inspired countless works of music, art, and poetry but has also played an important role in timekeeping, navigation and agricultural practices in many traditions.

For many cultures, the night sky, with its stars, planets and the Milky Way, is considered just as important a part of the natural environment as the forests, lakes and mountains below. Countless people around the world gaze at the night sky: not only amateur and professional astronomers, but also casual observers who enjoy looking up at the stars to contemplate our place in the cosmos.

However, the night sky is changing. Not only is ground-based light pollution increasing rapidly, but growing numbers of satellites and space debris in orbit around Earth are also impacting the night sky.

Earlier research showed that satellites and space debris may increase the overall brightness of the night sky. In a new paper in Nature Astronomy, my colleagues and I applied this knowledge to predicting the performance of a major astronomical sky survey. We found this phenomenon may make the survey 7.5 percent less efficient and US$21.8 million (roughly Rs. 180 crore) more expensive.

A brighter sky

As a cultural astronomer, I am interested in the role of the night sky in cultural traditions around the world. In particular, I am interested in how light pollution and increasing satellite numbers affect different communities.

The number of satellites in orbit is growing rapidly. Since 2019, the number of functional satellites in orbit has more than doubled to around 7,600. The increase is mostly due to SpaceX and other companies launching large groups of satellites to provide high-speed internet communications around the world.

By the end of this decade, we estimate, there may be 100,000 satellites in orbit around the Earth. Collisions that generate space debris are more likely as space fills with new satellites. Other sources of debris include the intentional destruction of satellites in space warfare tests.

Increasing numbers of satellites and space debris reflect ever more sunlight towards the night side of Earth. This will almost certainly change the appearance of the night sky and make it harder for astronomers to do research.

One way satellites impact astronomy is by appearing as moving points of light, which show up as streaks across astronomers’ images. Another is by increasing diffuse night sky brightness. This means all the satellites that are too dim or small to be seen individually, as well as all the small bits of space debris, still reflect sunlight, and their collective effect is to make the night sky appear less dark.

Hard times for astronomers

In our research, we present the first published calculations of the aggregate effects of satellites and space debris in low-Earth orbit on major ground-based astronomy research facilities.

We looked at the effect on the planned large-scale survey of the night sky to be carried out at the Vera Rubin Observatory starting in 2024. We found that, by 2030, reflected light from objects in low-Earth orbit will likely increase the diffuse background brightness for this survey by at least 7.5 percent compared to an unpolluted sky.

This would diminish the efficiency of this survey by 7.5 percent as well. Over the ten-year lifetime of the survey, we estimate this would add some $21.8 million (roughly Rs. 180 crore) to the total project cost.

Brighter night skies mean longer exposures through telescopes are needed to see distant objects in the cosmos. This will mean that for projects with a fixed amount of observing time, less science will be accomplished, and there will be increased competition for telescope access.

In addition, brighter night skies will also reduce the detection limits of sky surveys, and dimmer objects may not be detected, resulting in missed research opportunities.

Some astrophysical events are rare and if researchers are unable to view them when they occur, there might not be an opportunity to easily see a given event again during a survey’s operational period. One example of faint objects is near-Earth objects – comets and asteroids in orbits close to Earth. Brighter night skies make it more likely such potentially hazardous objects may remain undetected.

A dramatic and unprecedented transformation

Increases in diffuse night sky brightness will also change how we see the night sky with the unaided eye. As the human eye cannot resolve individual small objects as well as a telescope can, an increase in satellites and space debris will create an even greater increase in the apparent brightness of the night sky. (When using a telescope or binoculars, one would be able to make out more of the dimmer satellites individually.) The projected increase in night sky brightness will make it increasingly difficult to see fainter stars and the Milky Way, both of which are important in various cultural traditions. Unlike “ground-based” light pollution (which tends to be the worst near large cities and heavily populated areas), the changes to the sky will be visible from essentially everywhere on Earth’s surface.

Our models give us a conservative lower limit for a likely increase in night sky brightness. If numbers of satellites and space debris continue to grow at the expected rate, the impacts will be even more pronounced.

As we note in our paper, “we are witnessing a dramatic, fundamental, and perhaps semi-permanent transformation of the night sky without historical precedent and with limited oversight”. Such a transformation will have profound consequences for professional astronomy as well as for anyone who wishes to view an unpolluted night sky.


From smartphones with rollable displays or liquid cooling, to compact AR glasses and handsets that can be repaired easily by their owners, we discuss the best devices we’ve seen at MWC 2023 on Orbital, the Gadgets 360 podcast. Orbital is available on Spotify, Gaana, JioSaavn, Google Podcasts, Apple Podcasts, Amazon Music and wherever you get your podcasts.
Affiliate links may be automatically generated – see our ethics statement for details.

Continue Reading

Science

Ancient 2,000-Year-Old Sword Found in Poland Linked to Vandal Warrior Burial

Published

on

By

Ancient 2,000-Year-Old Sword Found in Poland Linked to Vandal Warrior Burial

A metal detector search for World War II relics in a forested area of Poland has led to the discovery of a much older artifact—a broken sword believed to be nearly 2,000 years old. Found in the Jura region of southern Poland, the sword was intentionally shattered into three pieces and is thought to have belonged to a Germanic warrior from the Vandal tribes. The object is undergoing further examination to determine its exact historical significance.

Weapon Identified as a Double-Edged Spatha

As reported by Live Science, according to research conducted at the Częstochowa Museum, the unearthed sword has been identified as a spatha, a double-edged broadsword commonly used by mounted Germanic warriors during the Roman Empire. This style of weapon was widely employed from the third century BCE to the fifth century CE. Southern Poland, where the artifact was found, was home to the Przeworsk culture during this period, which included the Vandals.

Evidence of Ritualistic Weapon Destruction

In a statement to Live Science, Mariusz Włudarz, President of the Inventum Association, explained that the sword had been deliberately broken as part of a funeral ritual. As per reports, the warrior’s weapon was shattered and placed on a cremation pyre, a practice commonly observed in Przeworsk culture. Historical records indicate that damaged weapons, including bent swords and altered shields, were often buried with fallen warriors, a tradition possibly inherited from Celtic customs.

Ongoing Research and Preservation Efforts

Investigations are currently being carried out at the Częstochowa Museum to analyse the composition and history of the sword. The precise location of the discovery is being kept confidential while further searches in the area are conducted. Once initial research is completed, the artifact is expected to undergo conservation work before being placed on display at the Mokra Museum.

The discovery adds to existing archaeological evidence of burial traditions associated with Germanic tribes and may provide further insights into Vandal funerary customs and their interactions with the Roman Empire.

For the latest tech news and reviews, follow Gadgets 360 on X, Facebook, WhatsApp, Threads and Google News. For the latest videos on gadgets and tech, subscribe to our YouTube channel. If you want to know everything about top influencers, follow our in-house Who’sThat360 on Instagram and YouTube.


iPhone 16e Features a Binned Version of Apple’s A18 Chipset With Fewer Cores



Bhoothaddam Bhaskar Narayana Now Streaming on Amazon Prime Video

Continue Reading

Science

Scientists Detect Rising Microplastics in Human Brains, Study Raises Concerns

Published

on

By

Scientists Detect Rising Microplastics in Human Brains, Study Raises Concerns

A rise in microplastic contamination in human brain tissue has been reported, with findings indicating an increase over recent years. Concerns about potential health impacts have been raised, as microplastics and nanoplastics have been detected in significant amounts. Research suggests that individuals with dementia had even higher concentrations, though the causation remains unclear. While the presence of these particles has been established, debates around research methodology and the accuracy of findings continue within the scientific community.

Study Highlights Rising Microplastic Levels

According to a study published in Nature Medicine on February 3, the concentration of microplastics in human brain tissue has risen by approximately 50 percent between 2016 and 2024. Researchers found that in those who had died with dementia, microplastic levels were nearly six times higher than in individuals without the condition. Comparisons with samples dating from 1997 to 2013 showed a continuous rise in microplastic accumulation over time.

The study examined brain, liver, and kidney tissue from 28 people who died in 2016 and 24 individuals from 2024. The highest concentrations were found in brain tissue, with microplastic levels ranging from seven to 30 times greater than in the kidney and liver. The presence of polyethylene, commonly used in food packaging, was most notable, accounting for 75 percent of the detected plastics.

Potential Impact on Brain Health

In an email to Live Science, study co-author Matthew Campen, a toxicologist at the University of New Mexico, stated that the accumulation of microplastics could potentially disrupt blood flow in brain capillaries or interfere with neural connections. While concerns about links to dementia exist, no direct causation has been established.

Concerns Over Research Methods

Skepticism regarding the study’s methodology has been expressed by some scientists. Speaking to Live Science, Oliver Jones, a professor of chemistry at RMIT University in Melbourne, questioned whether the results were biologically plausible. He pointed out that the main analytical method used, pyrolysis-gas chromatography-mass spectrometry, might have led to overestimated plastic concentrations due to interference from brain fats.

Despite these concerns, toxicologist Emma Kasteel from Utrecht University, in a statement to Live Science, stated that while the exact levels may be uncertain, the confirmed presence of microplastics in the brain warrants further investigation.

Continue Reading

Science

5,000-Year-Old Spanish Fortress Reveals Roman-Era Burial with Dagger

Published

on

By

5,000-Year-Old Spanish Fortress Reveals Roman-Era Burial with Dagger

A nearly 5,000-year-old fortress in southwestern Spain has revealed a surprising discovery—an isolated burial from the Roman era. The remains of a man, estimated to be between 25 and 35 years old, were found near the fortress’s outer wall, despite the site having been abandoned for over 2,500 years. The presence of a Roman military dagger suggests he may have been a soldier. As per sources, the burial appears unusual, as no other evidence of Roman occupation has been identified at the location. The fortress, known as Cortijo Lobato, was initially discovered in 2021 during surveys for a solar power plant.

Details of the Excavation

The excavation, conducted by the private archaeological firm Tera S.L. and led by archaeologist César Pérez, suggests that the Roman-era man may have been a deserter, victim of violence, or succumbed to natural causes. In a statement to Live Science, Pérez mentioned that ancient structures were sometimes repurposed as burial sites by later civilisations. The presence of a “pugio” dagger, commonly carried by Roman soldiers, supports the possibility of military involvement.

Copper Age Fortress and Its Fall

The fortress, constructed during the Chalcolithic period between 3200 and 2200 B.C., featured a central five-sided enclosure reinforced by multiple walls and ditches. Defensive structures included narrow entryways and bastions up to 20 feet wide. As per archaeological findings, fire damage suggests it was abandoned around 2450 B.C. after a violent attack. Evidence points to an expansion phase before its destruction, indicating its strategic importance at the time.

Unanswered Questions

While the discovery of the Roman burial remains a mystery, the fortress itself highlights an advanced understanding of military architecture in prehistoric Iberia. Investigations continue, with researchers aiming to uncover more about the site’s significance and the events that led to its abandonment.

Continue Reading

Trending