Based on atmospheric data and supercomputer modeling, scientists have proposed that Venus had Earth-like plate tectonics in the past. This discovery raises the possibility of early life on the planet and suggests that the timing of plate tectonics may be a crucial factor in the emergence of life on the planet. The study also demonstrates that the atmosphere of exoplanets can be utilized to understand their early histories, serving as a proof of concept for future research.

Scientists have found that Venus, a planet known for its extremely high temperatures, may have had tectonic plate movements like those on early Earth. According to a research study led by Brown University scientists, the composition of Venus' current atmosphere and surface pressure could only have been possible due to an early form of plate tectonics. Plate tectonics is a critical process for life on Earth as it involves multiple continental plates pushing, pulling, and sliding beneath one another. Over billions of years, this process on Earth led to the formation of new continents and mountains, which stabilized the planet's surface temperature and made it more suitable for life.

In contrast, Venus is Earth's closest neighbor and sister planet but has surface temperatures hot enough to melt lead. Scientists have previously believed that Venus had a "stagnant lid," meaning that its surface only had a single plate with minimal movement and gasses being released into the atmosphere. However, new research shows that Venus must have had plate tectonics after it formed, around 4.5 billion to 3.5 billion years ago, to account for the abundance of nitrogen and carbon dioxide in its atmosphere.

The scientists suggest that early tectonic movement on Venus, like on Earth, would have been limited in terms of the number of plates moving and how much they shifted. Furthermore, this process would have been happening on Earth and Venus simultaneously. This finding opens up exciting possibilities for understanding Venus' evolutionary past, the history of the solar system, and the potential for early life on Venus.

According to lead author Matt Weller, two planets may have coexisted in the same solar system at the same time, operating in a plate tectonic regime. This mode of tectonics allowed for life on Earth, and it also added to the possibility of microbial life on ancient Venus. The study also shows that the two planets were more similar than previously thought before diverging. It highlights the possibility that plate tectonics on planets might depend on timing, which may also be true for the emergence of life. Alexander Evans, a study co-author, said that planets may transition in and out of different tectonic states, and this may be common. Hence, we may have planets that transition in and out of habitability rather than being continuously habitable.

Scientists are investigating how the atmosphere can help in understanding the history of planets. This is important when studying nearby moons, such as Jupiter's Europa, and distant exoplanets. According to a research paper, scientists initially started this work to show that the atmospheres of far-off exoplanets can be powerful markers of their early histories. However, they later decided to investigate this point closer to home.

The researchers used current data on Venus' atmosphere as the endpoint for their models. At first, they assumed that Venus has had a stagnant lid throughout its entire existence. However, simulations recreating the planet's current atmosphere didn't match up with its resulting surface pressure and the amount of nitrogen and carbon dioxide present.

The researchers then simulated what would have had to happen on Venus to get to where it is today. They eventually matched the numbers almost exactly when they accounted for limited tectonic movement early in Venus' history, followed by the stagnant lid model that exists today. The team believes that this work serves as a proof of concept regarding atmospheres and their ability to provide insights into the past.

The study raises a key question: what happened to plate tectonics on Venus? The theory in the paper suggests that the planet ultimately became too hot, and its atmosphere too thick, drying up the necessary ingredients for tectonic movement. The researchers say the details of how this happened may hold important implications for Earth.

Upcoming NASA DAVINCI missions, which will measure gases in the Venusian atmosphere, may help solidify the study's findings. In the meantime, the researchers plan to delve deep into the question raised by the paper. They will explore what conditions could allow Earth to remain habitable and what conditions could force us to move in a Venus-like trajectory.

Researchers from Ruhr University Bochum in Germany have recently made a breakthrough discovery regarding the molecular journey of triglycerides in Mycobacteria tuberculosis, the pathogen responsible for tuberculosis. The team found that the molecular journey of triglycerides, which is essential for sealing the barrier of the bacterium, involves two key proteins: RV1410, a transmembrane protein, and LprG, a periplasmic protein. The identification of this molecular pathway has the potential to lead to new treatments and therapies for tuberculosis by weakening the mycobacterial barrier and making the bacterium more vulnerable to attack.

The tuberculosis bacterium has a double barrier which protects it from the host defense system, making it a formidable pathogen that causes a severe infectious disease claiming about 1.3 million lives annually worldwide. To better understand how to weaken this barrier, scientists are investigating how its molecular components work. Professor Lars Schäfer and Dr. Dario De Vecchis from the Centre for Theoretical Chemistry at Ruhr University Bochum, Germany, in collaboration with the Institute for Medical Microbiology at the University of Zurich, used supercomputer simulations to describe the molecular journey of triglycerides, one critical component of this barrier.

Triglycerides are high-energy molecules that are stored in our tissue as a form of fat energy. Mycobacteria also accumulate triglycerides, which contribute to sealing their cellular barrier. To be deposited in the mycobacterial barrier, triglycerides must be transported from inside the bacterial cell, the cytoplasmic space, through the membrane. Until now, the precise details of this molecular journey were unknown.

Professor Markus Seeger and Dr. Sille Remm at Zurich teamed up with Schäfer and De Vecchis to reveal how triglycerides are hunted from the transmembrane protein that extracts them from the bacterial membrane via lateral portals in the protein structure. Once extracted, the triglycerides are ultimately transported from the membrane and deposited into the barrier by the second intermediate actor LprG, a periplasmic protein that is anchored to the membrane and browses its surface chasing for triglycerides.

LprG has a water-repellent pocket that, when paired with the transmembrane protein, creates a greasy tunnel where the 'baton' triglyceride is handed off in a relay race to ultimately reach the barrier. The RV1410-LprG system could be thought of as the Trojan horse that scientists are using to conquer the pathogen's ramparts on the Troy battlefield of the mycobacterial membrane. Schäfer and De Vecchis's research aims to reveal the molecular pathway of triglycerides, which could lead to new strategies to target the RV1410-LprG system, weaken the mycobacterial barrier, enhance antimicrobial permeability, and ultimately develop more effective therapies against tuberculosis.

A team of astrophysicists from Trinity College Dublin and Onsala Space Observatory in Sweden are searching for extraterrestrial radio signals in the hopes of finding signs of intelligent alien life. The team is using both the Irish LOFAR telescope and its counterpart in Onsala, Sweden to monitor millions of star systems. Professor Evan Keane, Associate Professor of Radio Astronomy in Trinity’s School of Physics and Head of the Irish LOFAR Telescope, plans to monitor millions of star systems. The research is being supported by Science Foundation Ireland and will rely on machine learning techniques to sift through the immense volume of data.

For over 60 years, scientists have been searching for extraterrestrial radio signals, many of which have been conducted using single observatories. Unfortunately, this method has limited the ability to identify signals from the haze of terrestrial interference on Earth. Most of the effort has focused on frequencies above 1 GHz, as the single-dish telescopes employed operate at these frequencies.

Now, a new collaboration led by Trinity College Dublin, with the Breakthrough Listen team and Onsala Space Observatory in Sweden, is perfecting a multi-site, multi-telescope technique that allows them to search at much lower frequencies of 110 – 190 MHz.

The Breakthrough Listen program is a comprehensive search for technologically advanced extraterrestrial life. The program is developed with dedicated instruments at the Irish and Swedish LOFAR stations. One of the significant benefits of using multiple sites is that it reduces the likelihood of a "false positive" signal. Such signals can arise due to interference from various human sources on Earth.

The team has recently published details of their method and their ongoing search in the Astronomical Journal. They have already scanned 1.6 million star systems flagged as interesting targets by the Gaia and TESS space missions, run by ESA and NASA, respectively. So far, these searches have not yielded any results, but the search has only just begun.

Prof. Keane commented that evidence has steadily mounted over the last 50 years that the constituents and conditions necessary for life are relatively common in the Universe. This begs one of life's greatest unanswered questions: are we alone? The search for extra-terrestrial intelligence, or SETI, may seem like something from a movie to some people, but it has been a scientific pursuit for decades and a host of very good reasons.

With this project, the team is basing their search on the common assumption that civilizations elsewhere in the Universe may employ similar technologies to those developed on Earth. As a result, radio frequencies are a logical domain for conducting SETI surveys due to the widespread use of telecommunications and radar. The team's access to next-generation radio telescopes offers a great chance for a deep dive into the Universe.

Owen Johnson, PhD Candidate in Trinity's School of Physics, is the first author of the journal article, and the first Irish person to ever undertake a PhD on the topic of SETI. He added that what makes surveys like this one truly captivating is the fact that they are pushing these telescopes to their absolute limits, directing them toward substantial portions of the sky. As a result, they have the exciting possibility of discovering all sorts of wild and wondrous phenomena during this process and if they are very fortunate, even encountering cosmic neighbors.

LOFAR is soon to undergo a staged series of upgrades across all stations in the array across Europe, which will allow an even broader SETI at ranges of 15 - 240 MHz. The team has billions of star systems to explore and will be relying on some machine-learning techniques to sift through the immense volume of data.

"That in itself is interesting – it would be fairly ironic if humankind discovered alien life by using artificial intelligence," Owen Johnson concluded.

CACI has recently received a contract from NASA for Human Spaceflight Systems, Simulation, and Software Technology III. As per the contract terms, CACI will provide technical services and support to aid NASA in its space exploration mission. This contract will also help CACI enhance its proficiency in the space exploration industry.

CACI has been awarded a four-year single-award, indefinite delivery indefinite quantity expertise contract worth up to $150 million to continue its support of spaceflight systems, simulation, and software for NASA Johnson Space Center (JSC). The program aims to provide advanced aerospace engineering for crewed spacecraft systems, development of simulation and Virtual Reality (VR) applications, and software in support of human space flight. The contract builds on more than three decades of CACI’s dedicated support for JSC’s mission.

According to John Mengucci, CACI President and Chief Executive Officer, "This award demonstrates CACI’s proven expertise in supporting advanced systems for human spaceflight and space vehicles. We look forward to continuing this work and offering full-spectrum engineering and software solutions as NASA’s trusted provider.”

CACI will perform the work on this contract in the Houston area with JSC’s Engineering Directorate, primarily the Software, Robotics, and Simulation Division. The company will provide aerospace systems engineering and analysis support across a range of spacecraft systems including robotics and dynamics, guidance, navigation, and control, avionics, and power. Support will include developing software applications for in-flight systems, high-fidelity modeling and simulation, and VR graphics used to model spacecraft and the space environment for engineering analyses and astronaut extravehicular activity training.