Martian rock samples reveal a more complex history of water on the planet than previously thought

September 21, 21:22

Scientists initially expected to find sedimentary rocks formed by the accumulation of sand layers over millennia. These expectations were also based on the strong presence of carbonate minerals detected by orbital probes. On Earth, carbonates often form in shallow marine environments of oceans and lakes capable of supporting life.

However, Perseverance found igneous rocks that can form deep underground from magma or as a result of volcanic activity on the surface. According to NASA, these rocks are important chronicles of the past because mineral crystals preserve details of their formation moment. In the case of the Margin Unit, they recorded a particularly complex history of water activity in early Mars.

The team managed to determine the sequence of water interactions with the rocks, although the age of each episode could not yet be established. The first episode occurred when groundwater rich in carbon dioxide reacted with olivine present in the rocks. This process created carbonate in the rock fissures in lower-lying areas. Currently, these carbonate-filled fissures remain elevated structures, while the softer surrounding rocks have undergone erosion.

The second episode may be related to an ancient lake that occupied the crater. Some rocks in the Margin Unit also contain silica. According to planetary scientist Eleni Ravanis from the University of Hawaii at Manoa and co-author of the study, the transformation of olivine into carbonate can leave behind silica. The team found more of this mineral in rocks located below the water level.

The third and last identified event involved the formation of mineral veins in one spot in the eastern part of the Margin Unit. These structures are about 25 centimeters thick and contain minerals such as calcium sulfate and fluorite. The presence of fluorite attracted the researchers' attention, as this mineral usually forms during the circulation of hot water through volcanic rocks. This discovery indicates that the region subsequently experienced an episode of heated groundwater.

The Perseverance rover traveled approximately 265 meters in elevation while exploring the Margin Unit. On the highest parts, it found granular and crystalline rocks characteristic of olivine, with slight signs of contact with water. This olivine unit formed from magma deep within the crust. Cooling occurred slowly, allowing crystals to grow. The rocks only reached the surface after the overlying soil underwent erosion.

In the lowest parts, near the old lakebed, the rocks show signs of transformation: olivine grains are fractured, and silica is present between them. Carbonates and silica are important for studying ancient life. When water interacts with olivine on Earth, the reaction can release hydrogen, which serves as a food source for some microorganisms. The process also leaves behind carbonate and silica—minerals capable of preserving traces of the existence of these microorganisms.

olhardigital.com.brSeptember 21, 22:53

Brazilian Astronomer Records Asteroid Impact on Jupiter, One of the Rare Events Observable from Earth

A Brazilian citizen documented a rare phenomenon—the collision of an asteroid with Jupiter, the gas giant. Asteroids are remnants of the formation of the Solar System, which occurred about 4.6 billion years ago. Many of them continue to orbit the Sun, primarily in the so-called Asteroid Belt located between Mars and Jupiter.

However, these orbits are not entirely stable and can change under the influence of planetary gravity, especially the strong influence of the gas giant. Due to its colossal mass, Jupiter exerts a powerful gravitational pull on surrounding objects, functioning as an extensive cosmic shield. This scenario leads to the planet regularly being struck by space rocks, although the vast majority of these events remain unnoticed by telescopes.

In certain cases, larger stones enter Jupiter's atmosphere, causing a brief flash of light. This brilliance lasts only a few seconds but possesses enough energy to be registered by instruments on Earth, overcoming distances of hundreds of millions of kilometers.

Event Recording

One such event occurred on September 13, 2021, and was recorded by an amateur astronomer from Brazil who was observing Jupiter and noticed a rapid flare caused by the impact. This recording helped document another rare episode that can be observed directly.

The person responsible for this achievement is José Luís Pereira, a retired civil engineer living in São Caetano do Sul (SP). In an interview with the program Olhar Espacial, he spoke about his experience. He noted how great it is to contribute to the field of astronomy, especially planetary astronomy, by collecting data that can be used by professionals.

The observer's interest in astronomy arose in childhood, and the decision to focus on planets was influenced by the urban environment, as excessive lighting hinders the observation of fainter celestial bodies. Pereira explained that due to the high level of light pollution in a large city, it was very difficult to find nebulae and galaxies, so he focused on the planetary region.

To deepen his analyses, Pereira began using software created by the Frenchman Marc Delcroix, designed to search for impacts on Jupiter. This program automatically analyzes hours of continuous recordings sent by volunteers from around the world, identifying any suspicious changes in the planet's luminosity.

Observation Details

The historical recording took place during a night of bad weather. The amateur astronomer struggled with high cloud cover in the sky when he noticed a glowing point. He recalls: 'In the first video, while I was focusing the telescope, I saw a white spot on the planet, but I thought it was related to the settings.' Confirmation came the next morning when the program analyzed the night files and indicated a high probability of an impact. He used the program to separate the video into images, after which he saw a clear sequence from the beginning of the flash to its diminishing and disappearance, concluding: 'Yes, it really was an impact.'

Excited by the discovery, he contacted the program creator to verify the file. The analysis showed the scale of the event: the object had a diameter of 5 to 20 meters and was moving at a speed of 60 kilometers per second, creating an explosion approximately 5,000 kilometers in extent. Pereira explained: 'This flare was estimated to be 5,000 km in diameter. Therefore, the light it created was visible here on Earth.'

Significance of Data Contribution

Recording such events requires immense dedication and thousands of hours of continuous observation through cameras. The astronomer stated that before this impact, he had accumulated 6.5 days of continuous observations, emphasizing that community involvement allows for the collection of significant amounts of data unavailable to professional researchers alone.

Obtaining clear images requires overcoming the turbulence of the Earth's atmosphere, which distorts light and makes the planet appear shaky. Pereira compares this to the feeling of 'observing through water, inside a pool.' To cope with this instability and achieve magnification of more than a thousand times, the engineer improved the mechanics of his telescope and built a small private observatory to protect the equipment from the wind.

According to Pereira, assembling equipment of this level is a gradual process carried out in stages by replacing cameras, mirrors, and computerized mounts. After creating the structure, he expanded his horizons in recent years: he acquired a specialized solar telescope and now also dedicates time to recording solar flares and filaments. Pereira's discovery demonstrates the value of amateur collaboration in mapping small bodies of the Solar System. Continuous recordings help scientists calculate the frequency of such episodes, expanding the understanding of impact risks threatening other worlds and our own planet.

tecnoblog.netSeptember 21, 22:46

MediaTek plans to enter the Googlebook notebook market with the Dimensity CX C10 Max processor

Google officially established the Googlebook notebook category this Monday, September 21st. The models already launched, produced by brands such as Acer, Asus, Dell, HP, and Lenovo, use processors developed by Intel and Qualcomm.

However, MediaTek intends to join this group soon, presenting the Dimensity CX C10 Max. This chip is manufactured using TSMC's 3nm technology and features an eight-core CPU architecture.

The specifications of the new processor also include 11 GPU cores and the MediaTek 890 NPU, which achieves a performance of 55 TOPS. This capability is relevant because one of Google's requirements for the Googlebook line is having an NPU with performance equal to or greater than 45 TOPS, reflecting the focus of the new notebooks on running various artificial intelligence tasks.

Other features of the Dimensity CX C10 Max include support for LPDDR5X memory, Wi-Fi 7, Bluetooth 6.0, UFS 4.0 storage, and the ability to display two 4K screens simultaneously (although these features are supported by the chip, not all computers equipped with it will have all these capabilities).

In addition to high performance, MediaTek assures that the Dimensity CX C10 Max offers battery life that can last a full day and does not require a complex cooling system.

Although no date has been set, MediaTek informed 9to5Google that the Dimensity CX C10 will debut in a Lenovo Googlebook. Lenovo had previously announced a Googlebook based on an Intel Core Ultra 5 processor.

It is important to note that MediaTek is already active in the advanced computing segment, being a partner of Nvidia in the development of RTX Spark, a 'superchip' intended for high-performance PCs.