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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.


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James Webb Space Telescope Reveals a Stunning Einstein Ring in Hydrus

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James Webb Space Telescope Reveals a Stunning Einstein Ring in Hydrus

James Webb Space Telescope has recently captured a detailed image of an unusual cosmic occurrence. The latest images released by European Space Agency shows a glowing ring in the depths of space. It also reveals an effect that is caused by a massive galaxy bending light from another galaxy hidden behind it. The phenomenon has been recorded in the constellation Hydrus. It has been observed that light from the background galaxy forms a ring due to gravitational bending.

Formation of the Einstein Ring

According to the European Space Agency and the Canadian Space Agency the sight captured is known as an Einstein ring. It was reported that the effect is caused when a massive object bends light from another galaxy located behind it. The report further highlights that the foreground galaxy shown in the images belongs to a cluster known as SMACSJ0028.2-7537. The light from a distant spiral galaxy is being curved by the gravitational pull of the elliptical galaxy in front.

As per the official statement from ESA, the effect is a classic case of Albert Einstein’s theory of general relativity. The agency highlighted that the large objects in space can warp space-time, which in turn, forces light to travel around them in curved paths. The report further mentioned that when the observer, the light source and the massive object align perfectly, the light appears as a full ring.

Significance of Gravitational Lensing

The image was shared as part of the March picture of the month initiative by the space agencies. The images were capture using the Near Infrared Camera instrument on the James Webb Space Telescope with the help of Hubble Space Telescope’s Wide Field Camera 3 and Advanced Camera for Surveys.

It is also reported that such lensing phenomena assist astronomers in studying distant galaxies that would otherwise be too faint to observe. The ESA further noted that the magnification effect helps reveal the structure and composition of galaxies that existed shortly after the Big Bang

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NASA Astronaut Zena Cardman Appointed to Lead SpaceX Crew-11 Mission to ISS

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NASA Astronaut Zena Cardman Appointed to Lead SpaceX Crew-11 Mission to ISS

NASA astronaut Zena Cardman has been appointed to lead the upcoming SpaceX Crew-11 mission to the International Space Station (ISS). The mission is scheduled for launch in July. Cardman will take command of the four-member crew following her removal from a previous mission last year. She will be accompanied by Pilot Mike Fincke from NASA, Mission Specialist Kimiya Yui from Japan Aerospace Exploration Agency (JAXA) and Mission Specialist Oleg Platonov from the Russian space agency Roscosmos. Crew-11 will transport the team to the orbiting laboratory for an extended stay.

Crew Composition and Mission Details

According to an announcement by NASA officials, Cardman’s appointment to Crew-11 comes after her removal from SpaceX’s Crew-9 mission in August last year. That decision had been taken to accommodate NASA astronauts Barry Wilmore and Sunita Williams for their return to Earth following technical issues faced by Boeing’s Starliner capsule. These issues included thruster problems and helium leaks during its test flight to the ISS. The Starliner spacecraft had been returned without crew in September after safety concerns were raised.

Astronaut Experience and Background

As per NASA’s official statement, the Crew-11 mission will mark the first spaceflight experience for both Cardman and Platonov. Cardman had been selected by NASA in 2017. Platonov had been selected by Roscosmos in 2018. Mike Fincke, who will serve as the pilot, has already completed three space missions. He has spent a total of 382 days aboard the ISS during expeditions in 2004, 2008 and 2011. Kimiya Yui had served as a flight engineer during ISS Expeditions 44 and 45. He had remained aboard the station for 142 days from 2014 to 2015.

Changes Following Starliner Mission

According to reports, Cardman and astronaut Stephanie Wilson were removed from the Crew-9 assignment when NASA altered plans to facilitate the safe return of Starliner’s crew. Wilson’s reassignment has not been announced yet. Mike Fincke was earlier assigned to Boeing’s Starliner-1 mission. The launch date for Starliner-1 remains uncertain due to unresolved issues from previous flights. The Crew-11 mission is now expected to provide NASA with continued crew presence on the ISS. It will support ongoing research and operations.

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444-Million-Year-Old Inside-Out Fossil Without Head And Legs Found In South Africa

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444-Million-Year-Old Inside-Out Fossil Without Head And Legs Found In South Africa

Fossils of a 444 million-year-old marine creature, which is preserved in an unusual state, have been unearthed in South Africa. The remains belong to an extinct species of arthropod that lived long before dinosaurs, claims a new study. The fossils, which were discovered nearly 250 miles north of Cape Town in the Cederberg Mountains, shows an inside-out preservation technique. This means that the the soft tissues, such as muscles and guts, survived but the hard outer shell and limbs did not. This rare preservation offers a glimpse into ancient marine life and environments that existed during the Late Ordovician period.

Fossil Findings and Preservation

According to the study published in the journal Papers in Palaeontology, researchers have identified the specimens of the recently discovered fossils to be known as Keurbos susanae. The fossils were found in the Soom Shale, a geological formation recognised for preserving soft-bodied fossils. The researchers stated that the remains had been preserved without their shell and head while internal features like muscles and intestines remained intact. It has been reported that the species possibly lived in oxygen-deficient waters high in dissolved hydrogen sulphide which may have contributed to the unique preservation of soft tissues.

Challenges in Fossil Interpretation

Lead researcher Dr Sarah Gabbott, a Palaeontologist at the University of Leicester, told Live Science that the fossil was described as an “inside-out, legless, headless wonder”. She mentioned that muscles, tendons and even guts had been mineralised in remarkable detail while the outer shell and legs were missing due to decay. According to the report, the fossil dates back to a period when nearly 85 percent of marine life was wiped out by a mass extinction event. The absence of the exoskeleton has made it difficult for scientists to establish evolutionary links with other species from that time.

Limited Prospects of Further Discoveries

It has been reported that the fossil site where Keurbos susanae was discovered has been buried due to quarrying activity. Dr Gabbott mentioned that she had searched for additional specimens over the past two decades, but no new examples had been found. The species was named after her mother, Sue, who had encouraged her to pursue a career that brought her happiness. The research team noted that unless new specimens surface, the evolutionary significance of Keurbos susanae may remain unresolved.

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