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A new celestial navigation system developed by scientists at the University of South Australia (UniSA) is expected to enhance drone operations by enabling uncrewed aerial vehicles (UAVs) to navigate using stars. This innovative method, designed to eliminate reliance on GPS signals, could make drones harder to detect and immune to jamming attacks, according to reports. The research was published in the journal Drones and is being hailed as a step forward in providing resilient, cost-effective navigation systems.

Design and Functionality of the System

The navigation system integrates visual observations of stars with conventional autopilot technology, making it lightweight and affordable for smaller drones. Samuel Teague, a researcher at UniSA, explained to Space.com that the new system is more compact and simpler than traditional star-based navigation setups. These traditional systems, often bulky and expensive, have primarily been used in spacecraft and large aircraft.

Testing of the system on a fixed-wing UAV reportedly demonstrated its ability to determine location with a precision of up to 2.5 miles (4 kilometres). Such accuracy is particularly significant in environments where GPS signals are disrupted, as often occurs during electronic warfare.

Potential Applications in Defence and Civil Sectors

The system’s ability to function independently of external signals has drawn attention for both military and civilian applications. Javaan Chahl, a UniSA scientist, stated in Space.com that it could support environmental monitoring in remote areas, as well as long-duration surveillance missions in GPS-compromised regions.

The development comes amidst growing concerns about the vulnerability of drones to GPS jamming, a tactic widely reported to have been employed during the Ukraine conflict. By using celestial navigation, drones could evade detection and interception, raising implications for both offensive and defensive military strategies.

This innovation is expected to bolster the evolving role of drones in modern warfare and civilian operations, offering an alternative navigation method that enhances resilience and versatility.

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Scientists Discover Declining Global Ocean Evaporation Amid Rising Temperatures

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February 25, 2025

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Scientists Discover Declining Global Ocean Evaporation Amid Rising Temperatures

A decline in global ocean evaporation has been identified over the past decade, despite rising sea surface temperatures. This shift challenges established climate models, which have long linked higher temperatures to increased evaporation. The unexpected trend was observed through satellite data analysis, revealing that evaporation rates started decreasing after 2008. Researchers suggest that changing atmospheric circulation patterns and reduced wind speeds may be influencing this reversal, highlighting the complexity of Earth’s climate system.

Study Reveals Key Climate Anomalies

According to the study published in Geophysical Research Letters, an assessment of ocean heat flux data was conducted by researchers from the Institute of Geographic Sciences and Natural Resources Research at the Chinese Academy of Sciences. It was found that while ocean evaporation had been rising from 1988 to 2008, a reversal occurred thereafter, leading to a decline between 2008 and 2017.

The study’s lead author, Dr. Ma Ning, told Phys.org that two-thirds of the global oceans have shown reduced evaporation rates since the late 2000s. This decline contradicts previous expectations that global warming would consistently drive higher evaporation levels. The research suggests that large-scale atmospheric circulation shifts, particularly in the Northern Oscillation Index, may be contributing to the changes.

Impact of Wind Stilling on Evaporation

A decline in wind speed, referred to as “wind stilling,” has been identified as a crucial factor in this unexpected trend. Lower wind speeds result in reduced surface turbulence, thereby limiting the exchange of moisture between the ocean and the atmosphere. The study indicates that this phenomenon may be linked to broader climate oscillations affecting atmospheric circulation.

Dr. Ma explained that while evaporation levels have declined, this should not necessarily be viewed as a weakening of the global hydrological cycle. Instead, it may be an indication of natural climate variability influencing regional and global weather patterns. Researchers continue to investigate how these findings may affect long-term climate predictions.

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Arabia Had Five Times More Rainfall 400 Years Ago, Study Finds

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February 25, 2025

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Arabia Had Five Times More Rainfall 400 Years Ago, Study Finds

Extreme rainfall in Arabia was five times more intense 400 years ago, as indicated by recent climate reconstructions. The data suggests that the region, currently defined by arid desert, once had significantly higher precipitation levels, resembling a lush savannah. The findings highlight the necessity for improved climate preparedness as urbanisation expands in the region.

Study Reveals Significant Rainfall Variability Over Centuries

According to the study published in Science Advances, researchers from the University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science discovered that the Arabian Peninsula had significantly higher rainfall over the last 2,000 years. The landscape, now barren, was once covered with vegetation and inhabited by wildlife such as lions, leopards, and wolves. Findings indicate that 200 years ago, rainfall was still double what it is today.

Deep-Sea Brine Pools Provide Uninterrupted Climate Record

As per reports, sediment cores were extracted from a deep-sea brine pool in the Gulf of Aqaba using a remotely operated vehicle (ROV) deployed from the research vessel OceanXplorer. The brine’s chemistry enabled the preservation of undisturbed sediment layers, allowing an accurate reconstruction of Late Holocene rainfall trends.

Implications for Climate Preparedness in the Middle East

Speaking to Phys.org, Sam Purkis, Professor and Chair of the Department of Marine Geosciences at the University of Miami Rosenstiel School, stated that the study underscores the importance of climate resilience as development projects like NEOM in Saudi Arabia reshape the region. The assumption of long-term climate stability is not reliable, according to Amy Clement, a Professor in the Department of Atmospheric Sciences at the same institution.

Urgency for Enhanced Flood and Drought Management

The Middle East, already vulnerable to extreme weather, faces rising instances of flash floods and droughts. The catastrophic flooding seen across the Arabian Peninsula in early 2024 reinforces the need to study historical rainfall patterns to improve disaster preparedness. Mattie Rodrigue, Science Program Director at OceanX, highlighted the importance of technological advancements in climate research to better predict future hydroclimate trends.

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US Space Force Releases First X-37B Space Plane Image from Orbit

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February 25, 2025

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US Space Force Releases First X-37B Space Plane Image from Orbit

The United States Space Force has unveiled a never-before-seen image of its X-37B space plane in orbit. The photograph, released on February 20, was captured by an onboard camera as the vehicle conducted experiments above the African continent. Visible in the image are one of the space plane’s solar panels on the left side and what appears to be its open payload bay at the top. The X-37B, launched on December 28, 2023, aboard a SpaceX Falcon Heavy rocket, has remained in orbit for over a year. This marks the first time an official photograph of the vehicle in orbit has been shared with the public, offering insight into the spacecraft’s operational altitude and ongoing mission.

Details of the Mission and Orbital Operations

According to a statement from the U.S. Space Force, the X-37B is currently operating in an orbit significantly higher than previous missions, indicating a shift from low Earth orbit to more distant operational zones. The Falcon Heavy’s capability to launch payloads into geosynchronous orbit—approximately 35,000 km above Earth—suggests an extended range of testing and experimentation. The statement also outlined the objectives of the mission, which include evaluating new space domain awareness technologies, testing radiation effects on materials for NASA, and operating the spaceplane in new orbital environments.

Aerobraking Maneuvers and Technological Tests

The X-37B’s seventh mission has included first-of-its-kind aerobraking maneuvers, designed to utilise atmospheric drag to alter its orbit with minimal fuel consumption. As per Space Force reports, these maneuvers were executed to assess the feasibility of controlled re-entry strategies. Boeing, the manufacturer of the X-37B, has previously highlighted the spaceplane’s role as a platform for testing reusable space vehicle technologies. Past missions have involved trials related to solar power beaming, autonomous flight, and thermal protection systems.

Secrecy and Future Operations

While specific details regarding the X-37B’s payload and experiments remain classified, its extended orbital duration—surpassing a year—mirrors its previous mission, which lasted a record 908 days. The Space Force has not disclosed when the current mission is expected to conclude. Reports have also indicated that China has been testing its own reusable space plane, which launched on its third mission just weeks before the X-37B’s latest deployment. The competition in space-based military and research technology continues to evolve, with nations increasingly investing in long-duration experimental missions.

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