David Garofalo, Kennesaw State University

One of the most powerful objects in the universe is a radio quasar – a spinning black hole spraying out highly energetic particles. Come too close to one, and you’d get sucked in by its gravitational pull, or burn up from the intense heat surrounding it. But ironically, studying black holes and their jets can give researchers insight into where potentially habitable worlds might be in the universe.

As an astrophysicist, I’ve spent two decades modeling how black holes spin, how that creates jets, and how they affect the environment of space around them.

What are black holes?

Black holes are massive, astrophysical objects that use gravity to pull surrounding objects into them. Active black holes have a pancake-shaped structure around them called an accretion disk, which contains hot, electrically charged gas.

The plasma that makes up the accretion disk comes from farther out in the galaxy. When two galaxies collide and merge, gas is funneled into the central region of that merger. Some of that gas ends up getting close to the newly merged black hole and forms the accretion disk.

There is one supermassive black hole at the heart of every massive galaxy.

Black holes and their disks can rotate, and when they do, they drag space and time with them – a concept that’s mind-boggling and very hard to grasp conceptually. But black holes are important to study because they produce enormous amounts of energy that can influence galaxies.

How energetic a black hole is depends on different factors, such as the mass of the black hole, whether it rotates rapidly, and whether lots of material falls onto it. Mergers fuel the most energetic black holes, but not all black holes are fed by gas from a merger. In spiral galaxies, for example, less gas tends to fall into the center, and the central black hole tends to have less energy.

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One of the ways they generate energy is through what scientists call “jets” of highly energetic particles. A black hole can pull in magnetic fields and energetic particles surrounding it, and then as the black hole rotates, the magnetic fields twist into a jet that sprays out highly energetic particles.

Magnetic fields twist around the black hole as it rotates to store energy – kind of like when you pull and twist a rubber band. When you release the rubber band, it snaps forward. Similarly, the magnetic fields release their energy by producing these jets.

These jets can speed up or suppress the formation of stars in a galaxy, depending on how the energy is released into the black hole’s host galaxy.

Rotating black holes

Some black holes, however, rotate in a different direction than the accretion disk around them. This phenomenon is called counterrotation, and some studies my colleagues and I have conducted suggest that it’s a key feature governing the behavior of one of the most powerful kinds of objects in the universe: the radio quasar.

Radio quasars are the subclass of black holes that produce the most powerful energy and jets.

You can imagine the black hole as a rotating sphere, and the accretion disk as a disk with a hole in the center. The black hole sits in that center hole and rotates one way, while the accretion disk rotates the other way.

This counterrotation forces the black hole to spin down and eventually up again in the other direction, called corotation. Imagine a basketball that spins one way, but you keep tapping it to rotate in the other. The tapping will spin the basketball down. If you continue to tap in the opposite direction, it will eventually spin up and rotate in the other direction. The accretion disk does the same thing.

Since the jets tap into the black hole’s rotational energy, they are powerful only when the black hole is spinning rapidly. The change from counterrotation to corotation takes at least 100 million years. Many initially counterrotating black holes take billions of years to become rapidly spinning corotating black holes.

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So, these black holes would produce powerful jets both early and later in their lifetimes, with an interlude in the middle where the jets are either weak or nonexistent.

When the black hole spins in counterrotation with respect to its accretion disk, that motion produces strong jets that push molecules in the surrounding gas close together, which leads to the formation of stars.

But later, in corotation, the jet tilts. This tilt makes it so that the jet impinges directly on the gas, heating it up and inhibiting star formation. In addition to that, the jet also sprays X-rays across the galaxy. Cosmic X-rays are bad for life because they can harm organic tissue.

For life to thrive, it most likely needs a planet with a habitable ecosystem, and clouds of hot gas saturated with X-rays don’t contain such planets. So, astronomers can instead look for galaxies without a tilted jet coming from its black hole. This idea is key to understanding where intelligence could potentially have emerged and matured in the universe.

Black holes as a guide

By early 2022, I had built a black hole model to use as a guide. It could point out environments with the right kind of black holes to produce the greatest number of planets without spraying them with X-rays. Life in such environments could emerge to its full potential. https://www.youtube.com/embed/b7mTVX9IE0s?wmode=transparent&start=0 Looking at black holes and their role in star formation could help scientists predict when and where life was most likely to form.

Where are such conditions present? The answer is low-density environments where galaxies had merged about 11 billion years ago.

These environments had black holes whose powerful jets enhanced the rate of star formation, but they never experienced a bout of tilted jets in corotation. In short, my model suggested that theoretically, the most advanced extraterrestrial civilization would have likely emerged on the cosmic scene far away and billions of years ago.

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David Garofalo, Professor of Physics, Kennesaw State University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/

NASA is set to offer live coverage of the much-anticipated return of its SpaceX Crew-9 mission from the International Space Station (ISS). The event will commence with preparations for the Dragon spacecraft’s hatch closure at 10:45 p.m. EDT on Monday, March 17.

In a proactive move, NASA and SpaceX convened on Sunday to evaluate the weather and splashdown conditions off Florida’s coast in preparation for the Crew-9 mission return. Thanks to favorable weather forecasts for Tuesday evening, March 18, mission managers are targeting an earlier return opportunity. This adjustment serves to allow the onboard crew ample time to complete their handover duties while also providing operational flexibility in anticipation of less favorable weather later in the week.

The Crew-9 mission features NASA astronauts Nick Hague, Suni Williams, and Butch Wilmore, along with Roscosmos cosmonaut Aleksandr Gorbunov. These skilled astronauts have been conducting a long-duration science expedition aboard the ISS and will bring back critical time-sensitive research to Earth.

As the launch nears, mission managers will continue to monitor weather conditions, which will play a pivotal role in the undocking process. Factors such as spacecraft readiness, recovery team preparedness, and sea states will all influence the timing and location of the splashdown. NASA and SpaceX will finalize and communicate the specific splashdown site as the Crew-9 return approaches.

For those interested in following along, you can watch the Crew-9 return activities live on NASA+. Additional viewing options, including various social media platforms, are also available. Schedule information can be found at NASA Live.

Here’s a timeline of the upcoming live coverage (all times EDT and subject to change):

Monday, March 17

• 10:45 p.m. – Hatch closing coverage begins on NASA+

Tuesday, March 18

• 12:45 a.m. – Undocking coverage begins on NASA+
• 1:05 a.m. – Undocking

Following the undocking coverage, there will be an audio-only feed. Assuming favorable weather conditions at the splashdown sites, continuous coverage will resume on NASA+ before the deorbit burn.

• 4:45 p.m. – Return coverage begins on NASA+
• 5:11 p.m. – Deorbit burn (approximate time)
• 5:57 p.m. – Splashdown (approximate time)

Following the splashdown, there will be a Return-to-Earth media conference at 7:30 p.m. on NASA+, featuring key participants, including:

• Joel Montalbano, Deputy Associate Administrator, NASA’s Space Operations Mission Directorate
• Steve Stich, Manager, NASA’s Commercial Crew Program
• Jeff Arend, Manager for Systems Engineering and Integration, NASA’s International Space Station Office
• Sarah Walker, Director, Dragon Mission Management, SpaceX

Mark your calendars and prepare to witness this exciting milestone in space exploration as NASA’s Crew-9 mission returns home!

Find full mission coverage, NASA’s commercial crew blog, and more information about the Crew-9 mission at:

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https://www.nasa.gov/commercialcrew

The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/

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Moon Landing

In a significant milestone for space exploration, Firefly Aerospace’s Blue Ghost Mission 1 made a successful landing on the Moon at 3:34 a.m. EST on Sunday. Positioned near the volcanic feature of Mons Latreille within Mare Crisium, a vast basin exceeding 300 miles in diameter, this event marks a pivotal moment in NASA’s initiatives concerning lunar exploration.

This successful moon landing represents the first delivery under NASA’s Commercial Lunar Payload Services (CLPS) initiative for Firefly Aerospace, and it adds another achievement to the Artemis campaign aimed at returning humans to the Moon. The Blue Ghost lander now rests upright and stable on the lunar surface, ready to begin its suite of scientific operations.

The Blue Ghost craft is carrying ten cutting-edge NASA science and technology instruments designed to perform a variety of functions over approximately one lunar day, which translates to about 14 Earth days. Acting Administrator Janet Petro highlighted the importance of this mission, stating, “This incredible achievement demonstrates how NASA and American companies are leading the way in space exploration for the benefit of all.” The lessons learned from this mission will enhance future safety protocols for scientific exploration on the Moon and beyond.

Following its launch from NASA’s Kennedy Space Center on January 15, the Blue Ghost traveled over 2.8 million miles. During this journey, it downlinked more than 27 gigabytes of data while conducting several critical science operations. One notable achievement included signal tracking from the Global Navigation Satellite System (GNSS) at a record distance of 246,000 miles, validating the potential for similar positioning systems to be used effectively on the Moon.

Nicky Fox, associate administrator for science at NASA Headquarters, emphasized the significance of this mission in laying the groundwork for future human presence on the Moon: “The science and technology we send to the Moon now helps prepare the way for future NASA exploration and long-term human presence to inspire the world for generations to come.”

The instruments aboard the Blue Ghost will perform a variety of tasks during their lunar surface operations, including testing advanced drilling technology, collecting regolith samples, and developing lunar dust mitigation strategies. The insights gained from these experiments will contribute to our understanding of how space weather and cosmic forces interact with Earth.

As operations continue, the team intends to capture stunning imagery of the lunar sunset and investigate the behaviors of lunar dust during dusk conditions—an occurrence previously documented by Apollo 17 astronaut Eugene Cernan. Following the lunar sunset, the lander will remain functional for several hours into the lunar night.

Firefly Aerospace’s CEO, Jason Kim, expressed gratitude to NASA for the partnership and outlined the significance of this mission. “Blue Ghost’s successful Moon landing has laid the groundwork for the future of commercial exploration across cislunar space,” he stated, adding, “We’re now looking forward to more than 14 days of surface operations to unlock even more science data that will have a substantial impact on future missions to the Moon and Mars.”

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In total, five companies have been awarded 11 lunar deliveries under the CLPS initiative, propelling the lunar economy forward with over 50 instruments being sent to various lunar locations, including the lunar South Pole. With a cumulative maximum contract value of $2.6 billion through 2028, the CLPS initiative is set to revolutionize how we explore and utilize the Moon’s resources.

As we celebrate this monumental achievement, it is clear that the collaboration between NASA and companies like Firefly Aerospace is paving the way for a new era of exploration, promising exciting discoveries that will benefit our understanding of the cosmos and our own planet for generations to come.

Learn more about NASA’s CLPS initiative at:

https://www.nasa.gov/clps

The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/

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