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In a world first, NASA has crashed a spacecraft into an asteroid in an attempt to push the rocky traveler off its trajectory. The Double Asteroid Redirection Test – or DART – is meant to test one potential approach that could prevent an asteroid from colliding with Earth. David Barnhart is a professor of astronautics at the University of Southern California and director of the Space Engineering Research Center there. He watched NASA’s live stream of the successful mission and explains what is known so far.

1. What do the images show?

The first images, taken by a camera aboard DART, show the double asteroid system of Didymos – about 2,500 feet (780 meters) in diameter – being orbited by the smaller asteroid Dimorphos that is about 525 feet (160 meters) long.

As the targeting algorithm on DART locked onto Dimorphos, the craft adjusted its flight and began heading towards the smaller of the two asteroids. The image taken at 11 seconds before impact and 42 miles (68 kilometers) from Dimorphos shows the asteroid centered in the camera’s field of view. This meant that the targeting algorithm was fairly accurate and the craft would collide right at the center of Dimorphos.

The second-to-last image, taken two seconds before impact shows the rocky surface of Dimorphos, including small shadows. These shadows are interesting because they suggest that the camera aboard the DART spacecraft was seeing Dimorphos directly on but the Sun was at an angle relative to the camera. They imply the DART spacecraft was centred on its trajectory to impact Dimorphos at the moment, but it’s also possible the asteroid was slowly rotating relative to the camera.

The final photo, taken one second before impact, only shows the top slice of an image but this is incredibly exciting. The fact that NASA received only a part of the image implies that the shutter took the picture but DART, traveling at around 14,000 miles per hour (22,500 kilometers per hour) was unable to transmit the complete image before impact.

2. What was supposed to happen?

The point of the DART mission was to test whether it is possible to deflect an asteroid with a kinetic impact – by crashing something into it. NASA used the analogy of a golf cart hitting the side of an Egyptian pyramid to convey the relative difference in size between tiny DART and Dimorphos, the smaller of the two asteroids. Prior to the test, Dimorphos orbited Didymos in roughly 16 hours. NASA expects the impact to shorten Dimorphos’ orbit by about 1 percent or roughly 10 minutes. Though small, if done far enough away from Earth, a nudge like this could potentially deflect a future asteroid headed towards Earth just enough to prevent an impact.

3. What do we know already?

The last bits of data that came from the DART spacecraft right before impact show that it was on course. The fact that the images stopped transmitting after the target point was reached can only mean that the impact was a success.

While there is likely a lot of information to be learned from the images taken by DART, the world will have to wait to learn whether the deflection was also a success. Fifteen days before the impact, DART released a small satellite with a camera that was designed to document the entire impact. The small satellite’s sensors should have taken images and collected information, but given that it doesn’t have a large antenna onboard, the images will be transmitted slowly back to Earth, one by one, over the coming weeks.

4. What does the test mean for planetary defense?

I believe this test was a great proof-of-concept for many technologies that the US government has invested in over the years. And importantly, it proves that it is possible to send a craft to intercept with a minuscule target millions of miles away from Earth. From that standpoint DART has been a great success.

Over the course of the next months and years, researchers will learn just how much deflection the impact caused – and most importantly, whether this type of kinetic impact can actually move a celestial object ever so slightly at a great enough distance to prevent a future asteroid from threatening Earth.

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Researchers Reveal Crucial Ocean Processes That Help Fight Climate Change

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January 5, 2025

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Researchers Reveal Crucial Ocean Processes That Help Fight Climate Change

Organic carbon preservation in ocean sediments, a phenomenon critical to the Earth’s carbon cycle, has been illuminated by new research. The study explores mechanisms that prevent organic carbon from breaking down, a process vital for climate regulation. Preserved carbon, over time, can transform into fossil fuels, locking away carbon dioxide—a leading contributor to climate change. These findings offer insights into the Earth’s natural systems that regulate carbon levels and influence the formation of oil and gas reserves.

Study Identifies Key Carbon Preservation Mechanisms

According to a study led by scientists from The University of Manchester and the University of Leeds and published in the journal Nature Geoscience, two primary processes—sorption and molecular transformation—are crucial for carbon storage in ocean sediments.

Sorption involves the uptake of carbon by mineral surfaces, while molecular transformation converts small, reactive molecules into larger, stable forms. The study used a comprehensive model, integrating real-world sediment data, to identify these processes as dominant contributors to carbon preservation.

AI Provides Deeper Insights into Carbon Storage

Artificial intelligence (AI) was utilised to enhance the study’s model, enabling accurate predictions of carbon storage efficiency. Dr. Peyman Babakhani, a lead researcher, highlighted that AI helped clarify complex environmental processes. The research revealed that carbon preservation in sediments is nearly three times higher than earlier estimates, aligning closely with observed data.

Implications for Climate Change Mitigation

The findings underline the importance of sorption and molecular transformation in protecting organic matter from degradation and facilitating its burial in deeper sediment layers. This preserved carbon can eventually become fossil fuels, effectively keeping carbon dioxide from entering the atmosphere. These insights could influence climate change strategies, such as ocean fertilisation, aimed at enhancing natural carbon storage mechanisms.

By shedding light on these processes, the study opens pathways for managing carbon emissions and leveraging the ocean’s role in the global carbon cycle.

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Lake Mendota’s Bacteria Are Stuck in an Evolutionary Loop, Finds Study

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January 5, 2025

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Lake Mendota's Bacteria Are Stuck in an Evolutionary Loop, Finds Study

Seasonal variations in Lake Mendota in Wisconsin, US, appear to drive rapid evolutionary changes in bacterial species, as revealed through a long-term genetic study. Bacteria within the lake adapt to changing environmental conditions, with species undergoing significant genetic shifts over time. Despite these changes, many bacteria return to nearly identical genetic states each year, creating a cyclical pattern of evolution. The findings shed light on how microbial life responds to seasonal pressures, offering insights into broader ecological and evolutionary processes.

Bacterial Evolution Observed Over Decades

According to a study published in the Nature Microbiology journal, bacterial populations in Lake Mendota adapt to environmental shifts caused by the lake’s seasonal changes. Researchers examined genetic material from a unique archive of 471 water samples collected over 20 years.

Each year, bacteria responded to varying conditions, such as algae blooms in summer and ice cover in winter. Strains within species competed based on their adaptability to specific conditions, leading to a repeated cycle of genetic change.

Impact of Extreme Weather Events

Unusual weather in 2012 provided additional insights into bacterial evolution. During that year, early ice melt, hotter temperatures, and reduced algae levels resulted in significant genetic changes in bacterial communities. Research revealed a notable shift in genes related to nitrogen metabolism among several species, indicating long-term genetic adaptations to these atypical conditions.

Implications for Climate Change

Robin Rohwer, a researcher at the University of Texas at Austin, told Phys.org that climate change may intensify such evolutionary responses, as extreme weather events become more frequent. These findings highlight the adaptability of microbial ecosystems to both gradual and abrupt environmental changes.

Advanced Techniques Unlock New Discoveries

The study, led by Rohwer and supported by computational resources at the Texas Advanced Computing Center, reconstructed bacterial genomes from fragmented DNA samples. With over 30,000 genomes analysed, this research represents one of the most extensive investigations into microbial evolution in a natural setting, offering valuable data for future studies.

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First-Ever Female Burial with Weapons, Believed to Be a Warrior, Discovered in Hungary

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First-Ever Female Burial With Weapons Uncovered in Hungary

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January 4, 2025

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First-Ever Female Burial With Weapons Uncovered in Hungary

The first confirmed case of a female burial with weapons from the 10th century in the Carpathian Basin, Hungary, has been uncovered. Skeletal remains and grave goods, including weaponry, were identified at the Sárrétudvari-Hízóföld cemetery. This discovery, described by experts, challenges prior assumptions about societal roles during the Hungarian Conquest period, a time marked by mounted archers and frequent conflicts. Although evidence of weapons was present, researchers approached conclusions cautiously, ensuring findings were grounded in detailed analysis.

Archaeological Findings and Methodology

The study was led by Dr. Balázs Tihanyi and his colleagues, published in PLOS ONE. As reported by Phys.org, the burial contained a silver penannular hair ring, bell buttons, a bead necklace, and archery-related items such as an arrowhead, quiver parts, and an antler bow plate. Genetic and morphological tests confirmed the individual, referred to as SH-63, was female, despite the poor preservation of skeletal remains.

Dr. Balázs Tihanyi, leader of the research team, told the publication that the combination of grave goods in SH-63’s burial was unique within the cemetery, blending typically male and female items.

Challenges in Determining Warrior Status

The presence of weapons did not lead to assumptions about SH-63’s status as a warrior. Researchers noted that being part of a warrior class involved specific societal roles, and physical evidence alone is insufficient for confirmation.

Indicators such as joint changes and trauma were identified, possibly suggesting activities like horse riding or weapon use. However, it was emphasised that these signs could also result from daily life unrelated to warfare.

Historical Implications

It was reported that this discovery provides a glimpse into the complexity of life in 10th-century Hungary, with SH-63’s burial raising questions about gender roles and social structures of the time. Further investigations are planned to compare this case with others from the same period, aiming to deepen understanding of the era’s societal dynamics.

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