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Asteroids, Comets and Meteors

Unveiling the Secrets of Mars’ Ancient Rivers

Mars may not have always been the dry and dusty world we imagine. A staggering network of ancient riverbeds, spanning over 15,000 kilometers, has been discovered in the planet’s Noachis Terra region, suggesting that flowing water, fueled by precipitation, was once widespread. Unlike previously studied valley networks, these “inverted channels” reveal a long history of persistent water activity, challenging the idea that Mars was merely cold and dry.

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The Red Planet’s Hidden Past Revealed: Scientists Discover 15,000 Kilometers of Lost Rivers on Mars

A groundbreaking study has shed new light on Mars’ history, suggesting that the planet was once much wetter than previously thought. Led by PhD student Adam Losekoot and funded by the UK Space Agency, researchers have identified over 15,000 kilometers of ancient riverbeds in the Noachis Terra region of Mars’ southern highlands.

The discovery was made possible by analyzing fluvial sinuous ridges, also known as inverted channels, which are believed to have formed when sediment deposited by rivers hardened and was later exposed as the surrounding material eroded. These features have been found across various terrains on Mars, indicating that flowing water was once widespread in this region.

The new research focuses on fluvial sinuous ridges as an alternate form of evidence for ancient surface water, rather than relying on valley networks, which are branching erosional features that have traditionally been used to infer historical rainfall and runoff. The study’s findings indicate that surface water may have been stable in Noachis Terra during the Noachian-Hesperian transition, a period of geologic and climatic change around 3.7 billion years ago.

“This is an exciting discovery because it shows that Mars was once a much more complex and active planet than we thought,” said Losekoot. “Studying Mars, particularly an underexplored region like Noachis Terra, is really exciting because it’s an environment which has been largely unchanged for billions of years. It’s a time capsule that records fundamental geological processes in a way that just isn’t possible here on Earth.”

The researchers used data from three orbital instruments: the Context Camera (CTX), the Mars Orbiter Laser Altimeter (MOLA) and the High Resolution Imaging Science Experiment (HiRISE). These datasets allowed the team to map the locations, lengths, and morphologies of ridge systems across a wide area.

Many of the features appear as isolated ridge segments, while others form extensive interconnected systems. The spatial distribution and extent of these ridges suggest that they likely formed over a geologically significant period under relatively stable surface conditions.

“Our work is a new piece of evidence that suggests that Mars was once a much more complex and active planet than it is now,” said Losekoot. “The fact that the ridges form extensive interconnected systems suggests that the watery conditions must have been relatively long-lived, meaning Noachis Terra experienced warm and wet conditions for a geologically relevant period.”

These findings challenge existing theories that Mars was generally cold and dry, with a few valleys formed by ice-sheet meltwater in sporadic, short periods of warming. The discovery of ancient riverbeds on Mars provides new insights into the planet’s history and suggests that it may have been more similar to Earth than previously thought.

Asteroids, Comets and Meteors

Unveiling Ancient Secrets on Mars: A Breakthrough Technique Reveals Hidden Clues

A curious red Martian rock nicknamed Sapphire Canyon has scientists excited, as its spotted appearance hints at possible organic origins. On Earth, researchers tested a powerful laser technique, O-PTIR, on a similar rock found by chance in Arizona, proving it can rapidly and precisely reveal a material’s chemical makeup. This high-resolution method could play a key role in analyzing Mars samples once they arrive, adding to its growing track record in NASA missions like Europa Clipper.

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The discovery of an unusual rock sample, named Sapphire Canyon, by NASA’s Mars rover Perseverance in 2024 has sent shockwaves of excitement through the scientific community. This enigmatic rock features striking white spots with black borders within a red mudstone, sparking hopes that it might hold clues about the presence of organic molecules on Mars.

To unlock the secrets hidden within Sapphire Canyon, researchers from the Jet Propulsion Laboratory and the California Institute of Technology employed an innovative technique called optical photothermal infrared spectroscopy (O-PTIR). This method uses two lasers to study a material’s chemical properties, creating its unique fingerprint by measuring thermal vibrations on its surface.

The team, led by Nicholas Heinz, put O-PTIR to the test on a basalt rock with dark inclusions of similar size to Sapphire Canyon’s. By chance, Heinz stumbled upon this visually similar rock while hiking in Arizona’s Sedona region. The results were astounding – O-PTIR proved to be an extremely effective tool for differentiating between the primary material and its dark inclusions.

One of the key advantages of O-PTIR is its enhanced spatial resolution, allowing scientists to pinpoint specific regions of interest within a sample. Additionally, this technique is remarkably rapid, with each spectrum collection taking mere minutes. This enables researchers to apply more sensitive techniques to study areas containing potential organics in greater detail.

Heinz expressed his hope that the capabilities of O-PTIR will be considered for future Martian samples, as well as those from asteroids and other planetary surfaces. The team’s expertise is currently the only one available at NASA’s Jet Propulsion Laboratory, having previously assisted with confirming the cleanliness of the Europa Clipper mission prior to its launch.

As the scientific community continues to unravel the mysteries hidden within Sapphire Canyon, Heinz and his team are working closely with NASA’s Mars science team to test O-PTIR on algal microfossils typically used as Mars analogs for the rovers. This breakthrough technique is poised to revolutionize our understanding of Martian geology and potentially uncover signs of ancient life on the Red Planet.

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Asteroids, Comets and Meteors

The Elusive Planet Next Door Continues to Baffle Astronomers

NASA’s James Webb Space Telescope has detected strong evidence for a giant planet orbiting Alpha Centauri A, the nearest Sun-like star to Earth. Located just 4 light-years away, this possible Saturn-mass world may travel between one and two times the distance from its star that Earth does from the Sun. The planet appears to lie in the habitable zone, though its gas giant nature makes it unlikely to host life.

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The search for exoplanets has been a thrilling adventure in recent years, with scientists using various methods to detect worlds beyond our solar system. One such method involves observing the light emitted by stars, which can be affected by the presence of planets. In the case of the Alpha Centauri star system, located just 4 light-years away from Earth, astronomers have been trying to confirm the existence of a giant planet orbiting one of its three stars.

Using the Mid-Infrared Instrument (MIRI) on NASA’s James Webb Space Telescope, researchers have found strong evidence of a possible gas giant planet orbiting Alpha Centauri A. The observations were made in August 2024 and February 2025, using the coronagraphic mask aboard MIRI to block the light from Alpha Centauri A. While the initial detection was exciting, additional observations in April 2025 did not reveal any objects like the one identified in August 2024.

To investigate this mystery, researchers used computer models to simulate millions of potential orbits, incorporating the knowledge gained when they saw the planet and when they did not. These simulations suggested that the planet could be a gas giant approximately the mass of Saturn, orbiting Alpha Centauri A in an elliptical path varying between one to two times the distance between the Sun and Earth.

While the existence of this planet is still uncertain, it would mark a new milestone for exoplanet imaging efforts if confirmed. The potential planet seen in the Webb image of Alpha Centauri A would be the closest to its star seen so far, and its very existence in a system of two closely separated stars would challenge our understanding of how planets form, survive, and evolve in chaotic environments.

The James Webb Space Telescope is the world’s premier space science observatory, and its MIRI instrument was developed through a 50-50 partnership between NASA and ESA. The telescope is solving mysteries in our solar system, looking beyond to distant worlds around other stars, and probing the mysterious structures and origins of our universe and our place in it.

If confirmed by additional observations, the team’s results could transform the future of exoplanet science. This would become a touchstone object for exoplanet science, with multiple opportunities for detailed characterization by Webb and other observatories. NASA’s Nancy Grace Roman Space Telescope, set to launch by May 2027, is equipped with dedicated hardware that will test new technologies to observe binary systems like Alpha Centauri in search of other worlds.

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Asteroids, Comets and Meteors

“Explosive Consequences: Baby Star’s Jet Causes Shockwave That Threatens Its Own Existence”

Astronomers have stumbled upon an incredible cosmic chain reaction: a young star launched a high-speed jet that ignited an explosion, creating a massive bubble in space that is now slamming back into the very star system that birthed it. This startling feedback loop, caught for the first time using ALMA data, may reshape what we know about how stars and planets form, and the volatile environments they endure. Nature, it seems, still holds dramatic surprises.

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Astronomers have made a groundbreaking discovery in space, revealing that a young star’s own explosion can push back against it and influence its formation. This finding has significant implications for our understanding of how stars and their planets come into being.

Stars are formed from the collapse of molecular clouds in space. As these clouds collapse, they retain their angular momentum, causing them to spin and evolve into protoplanetary disks. Within these disks, stars and planets form, but not all material is incorporated into new stars and planets. Some excess matter is ejected through powerful jets aligned with the rotation axis of the disk.

A team of Japanese astronomers was re-examining archival data from the Atacama Large Millimeter/submillimeter Array (ALMA) when they stumbled upon an explosively expanding bubble structure near a protoplanetary disk called WSB 52. Located 441.3 light-years away in the direction of the constellation Ophiuchus, further analysis revealed that a shock front created by the expanding bubble was colliding with and distorting the disk.

This phenomenon, known as a “shock-induced disk distortion,” has not been predicted theoretically and is unprecedented among young stars. The research team found that the center of the bubble aligned with the disk’s rotation axis, indicating that a jet emitted from WSB 52 hundreds of years ago collided with cold gas near the disk, causing it to compress and explode.

According to lead researcher Masataka Aizawa at Ibaraki University, “This discovery shows us that nature is far more complex than humans think. The effects of these explosions on star formation and planetary system creation are still unknown and require further research.”

The implications of this finding are profound, suggesting that young stars and their planets may be exposed to a harsher environment than previously thought. As scientists continue to explore the mysteries of the universe, this discovery serves as a reminder that there is still much to learn about the intricate processes governing the birth and evolution of celestial bodies.

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