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Ancient Martian Valleys Reveal Gradual Climate Shift From Warm And Wet To Cold And Icy: Study

A new study led by researchers at IIT Bombay has provided fresh evidence showing how Mars gradually transitioned from a warm, water-rich planet to a cold, icy world

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Left: Mars. Credit: Kevin Gill/Wikimedia. Right: Thaumasia region of Mars. Credit: NASA/JPL/USGS

A new study led by researchers at IIT Bombay has provided fresh evidence showing how Mars gradually transitioned from a warm, water-rich planet to a cold, icy world, by analysing ancient valley networks in the Thaumasian Highlands region of the Red Planet.

The findings, based on high-resolution orbital data, suggest that Mars experienced a long-term climate shift—from surface water-driven erosion during the Noachian period around four billion years ago to increasingly glacial and frozen conditions by the Hesperian period, roughly three billion years ago.

“Both these planets started with similar compositions and atmospheres. So, one of the most pressing questions is, where did all that water go, and why didn’t Mars evolve along the same direction as Earth? So, we wanted to find at what stage it lost its water,” said Alok Porwal of IIT Bombay in a statement issued by the institute.

Tracking Mars’ changing climate

The research focused on the Thaumasia Highlands, one of Mars’ most ancient geological regions, which stretches from the equator toward higher latitudes. According to the researchers, this makes it an ideal natural laboratory to study climate-driven geological changes over time.

“The Thaumasia Highlands is a region somewhat like the Indian subcontinent. It extends from the equator to higher latitudes, so it has a range of climates and geographies. It also has both very ancient geologic formations and more recent features, which gives an overall view of the planet,” Porwal said.

The team analysed more than 150 complex valley networks using datasets from NASA’s Context Camera (CTX) and Mars Orbiter Laser Altimeter (MOLA), the European Space Agency’s High Resolution Stereo Camera (HRSC), and ISRO’s Mars Orbiter Camera aboard the Mangalyaan mission. Each valley was carefully mapped to minimise errors caused by natural topographic variations.

Water-carved valleys to ice-shaped terrain

The researchers examined both qualitative and quantitative indicators to identify whether valleys were shaped by flowing water or glacial ice. Features such as fan-shaped sediment deposits and branching valley patterns pointed to fluvial erosion, while moraine-like formations, viscous flow features and ribbed terrain indicated glacial processes.

“When water is flowing, it carries heavy materials at the bottom and cuts the ground vertically. So, the shape it carves is more of a V-shaped valley. Glaciers, which have a mix of ice and debris, are heavier. When they move, they slide over the surface and create a U-shaped valley,” said Dibyendu Ghosh, the study’s first author, in the IIT Bombay statement.

Another key parameter was the angle at which valleys merge.

“When water is flowing, it follows the slope, so two valleys will flow parallel to each other and meet at an acute angle. Glaciers can move laterally, so the angles become more obtuse,” Ghosh explained.

The analysis showed that low-latitude valleys near the Martian equator were primarily shaped by flowing surface water, indicating warmer climatic conditions. In contrast, valleys at higher latitudes displayed increasing signs of fluvioglacial activity, suggesting a colder environment where ice played a growing role.

Evidence of frozen subsurface water

The study also supports the idea that much of Mars’ surface water gradually retreated underground as the planet cooled.

According to the researchers, valley formation peaked during the Noachian period between 4.1 and 3.7 billion years ago, declined during the transition to the Hesperian, and later showed stronger signatures of glacial modification and groundwater erosion.

Future exploration

While the findings offer a more coherent picture of Mars’ climatic evolution, the team noted that linking valley networks precisely to subsurface structures and geological timelines remains challenging.

Looking ahead, Porwal emphasised the need for more advanced missions to refine the planet’s climate history. “If I had a chance to suggest (for a future Mars mission), I would recommend a lander to get more geophysical data. And an orbiter with high-resolution imaging and infrared imaging capabilities to thoroughly study its geological history,” he said.

Space & Physics

NASA to launch first crewed Artemis Moon mission on April 1

NASA will launch Artemis II on April 1, marking the first crewed mission around the Moon in over 50 years.

Joe Jacob

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NASA will launch Artemis II on April 1, marking the first crewed mission around the Moon in over 50 years.
Artemis II crew members (from left) CSA (astronaut Jeremy Hansen, and NASA astronauts Christina Koch, Victor Glover, and Reid Wiseman. Image credit: NASA/Kim Shiflett

Artemis will be the first human mission to travel beyond low-Earth orbit since the Apollo era, and it is designed as a 10-day journey that will take astronauts on a flyby around the Moon before returning to Earth.

NASA is set to make history with the launch of its first crewed Artemis mission around the Moon, with liftoff targeted for April 1, 2026, marking humanity’s return to deep space exploration after more than five decades.

The mission, known as Artemis II, will carry four astronauts aboard the Orion spacecraft using NASA’s powerful Space Launch System rocket. The launch is scheduled from Kennedy Space Center in Florida, with additional backup launch opportunities extending through early April.

This will be the first human mission to travel beyond low-Earth orbit since the Apollo era, and it is designed as a 10-day journey that will take astronauts on a flyby around the Moon before returning to Earth.

The crew includes NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, along with Canadian astronaut Jeremy Hansen. The mission is expected to test critical systems such as life support, navigation, and the spacecraft’s heat shield in deep space conditions.

Unlike future Artemis missions, Artemis II will not land on the lunar surface. Instead, it serves as a crucial step toward upcoming missions that aim to establish a sustained human presence on the Moon and eventually enable crewed missions to Mars.

NASA officials say the mission represents a major milestone in space exploration, combining international collaboration and advanced technology to usher in a new era of human spaceflight.

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Space & Physics

Magnetic Fields Found to Shape Star Formation Near Milky Way Disc

Scientists map magnetic fields in molecular clouds near the Milky Way, revealing their key role in slowing and shaping star formation.

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Magnetic fields star formation in molecular clouds within a nebula in the Milky Way
Image credit: NASA/Unsplash

Scientists map magnetic fields in molecular clouds near the Milky Way, revealing their key role in slowing and shaping star formation.

Scientists have uncovered new insights into how stars are formed by mapping the magnetic fields surrounding molecular clouds near the Milky Way’s disc, offering a deeper understanding of one of the universe’s most fundamental processes.

The study focuses on two small molecular clouds—L1604 and L121—revealing how magnetic fields influence the balance between gravity and internal pressure during star formation.

Magnetic Fields Star Formation in Milky Way Clouds

For decades, astronomers have understood star formation as a balance between gravity pulling gas inward and internal pressure pushing outward. However, the new research highlights a third critical factor: magnetic fields.

In a media statement, the researchers explained that magnetic fields act as an invisible force shaping how molecular clouds evolve and collapse to form stars.

The study was conducted by scientists from the Aryabhatta Research Institute of Observational Sciences (ARIES)m Uttarakhand, India and Assam University, using advanced polarimetric techniques to detect otherwise invisible magnetic structures.

Magnetic Fields Star Formation Observed Using Polarimetry

To map these fields, the team used R-band polarimetry with the ARIES Imaging Polarimeter mounted on a 104-cm telescope in Nainital.

This technique measures how starlight becomes polarised as it passes through dust grains aligned by magnetic fields.

In a media statement, the researchers said that by analysing thousands of such light signals, they were able to “see” the skeleton of magnetic fields surrounding the molecular clouds for the first time.

Two Molecular Clouds Reveal Contrasting Behaviour

The study examined two distinct clouds:

  • L1604, located about 816 parsecs away, is dense and massive, with strong potential for future star formation
  • L121, much closer at 124 parsecs, is less dense but exhibits a stronger and more organised magnetic field

In a media statement, the scientists noted that the orderly magnetic structure in L121 suggests it has not yet undergone intense gravitational collapse, unlike more active star-forming regions.

Magnetic Fields Star Formation Controlled by Energy Balance

By calculating magnetic field strength, the researchers found that both clouds are sub-critical, meaning magnetic forces are strong enough to resist gravitational collapse across most of their structure.

In a media statement, the team stated that magnetic energy dominates over both turbulence and gravity at the outer regions of the clouds.

However, deep within the dense cores, gravity may begin to take over, creating conditions suitable for star formation.

The “Recipe” for Star Formation

The findings suggest that magnetic fields play a crucial role in regulating how quickly stars form.

In a media statement, researchers said that magnetism acts as an “invisible hand,” slowing down star formation and preventing galaxies from converting all their gas into stars at once.

The study positions L1604 and L121 as natural laboratories for understanding the interplay between gravity and magnetism.

Rather than being passive clouds, they represent dynamic systems where fundamental forces interact over millions of years to shape the birth of stars.

The findings offer a clearer picture of how galaxies like the Milky Way sustain star formation over long cosmic timescales, balancing collapse with control.

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Researchers Use AI to Enable Robots to ‘See’ Through Walls

MIT researchers develop AI-powered system using wireless signals to help robots see through walls and reconstruct hidden objects and indoor spaces.

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MIT researchers use generative AI to reconstruct hidden 3D objects.
MIT researchers use generative AI to reconstruct hidden 3D objects. Credit: Courtesy of the researchers/MIT News

Researchers at Massachusetts Institute of Technology have developed a new artificial intelligence-powered system that allows robots to detect and reconstruct objects hidden behind walls and obstacles, marking a significant breakthrough in machine perception.

The system combines wireless signals with generative AI models to enable what researchers describe as a new form of “wireless vision,” potentially transforming robotics, logistics, and smart environments.

AI See Through Walls Using Wireless Signals

The research builds on over a decade of work using millimeter wave (mmWave) signals—similar to those used in Wi-Fi—which can pass through materials such as drywall, plastic, and cardboard and reflect off hidden objects.

Earlier approaches could only capture partial shapes due to limitations in how these signals reflect.

The new system overcomes this by combining wireless reflections with generative AI, enabling the reconstruction of complete object shapes even when they are not directly visible.

“What we’ve done now is develop generative AI models that help us understand wireless reflections. This opens up a lot of interesting new applications, but technically it is also a qualitative leap in capabilities, from being able to fill in gaps we were not able to see before to being able to interpret reflections and reconstruct entire scenes,” said Fadel Adib, in a media statement.

“We are using AI to finally unlock wireless vision.”

AI See Through Walls Improves Object Reconstruction

The system, called Wave-Former, first creates a partial image of a hidden object using reflected wireless signals. It then uses a trained AI model to fill in missing parts and refine the reconstruction.

In tests, Wave-Former successfully reconstructed around 70 everyday objects—including boxes, utensils, and fruits—with nearly 20% higher accuracy than existing methods.

The objects were placed behind or under materials such as wood, fabric, and plastic, demonstrating the system’s robustness in real-world conditions.

AI See Through Walls Reconstructs Entire Rooms

Beyond individual objects, the researchers developed a second system capable of reconstructing entire indoor environments.

Using a single stationary radar, the system tracks how wireless signals bounce off moving humans and surrounding objects. These reflections—often considered noise—are analysed by AI to map out the room layout.

The system, known as RISE, was tested using over 100 human movement patterns and achieved twice the accuracy of existing techniques in reconstructing indoor spaces.

Privacy-Preserving Alternative to Cameras

Unlike camera-based systems, this approach does not capture visual images, offering a privacy-preserving alternative for indoor monitoring and robotics.

Because it relies on wireless signals rather than cameras, it can detect presence and layout without revealing identifiable details.

Applications in Warehousing and Smart Homes

The researchers say the technology could have wide-ranging applications:

  • Warehouses: Robots could verify packed items before shipping, reducing errors and returns
  • Smart homes: Robots could better understand human location and movement
  • Human-robot interaction: Improved safety and efficiency in shared environments

The system could also pave the way for future “foundation models” trained specifically on wireless data, similar to how large AI models are trained for language and vision.

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