Feed aggregator
SpaceX fires up 6th Starship to prep for test flight (video, photo)
We’ve just doubled the number of gravitational waves we can find
We’ve just doubled the number of gravitational waves we can find
Earth got even hotter than we thought during past 500 million years
Earth got even hotter than we thought during past 500 million years
'Apollo 13: Survival:' Director Peter Middleton on his immersive new Netflix documentary (exclusive)
NASA’s Chandra Finds Galaxy Cluster That Crosses the Streams
Astronomers using NASA’s Chandra X-ray Observatory have found a galaxy cluster has two streams of superheated gas crossing one another. This result shows that crossing the streams may lead to the creation of new structure.
Researchers have discovered an enormous, comet-like tail of hot gas — spanning over 1.6 million light-years long — trailing behind a galaxy within the galaxy cluster called Zwicky 8338 (Z8338 for short). This tail, spawned as the galaxy had some of its gas stripped off by the hot gas it is hurtling through, has split into two streams.
This is the second pair of tails trailing behind a galaxy in this system. Previously, astronomers discovered a shorter pair of tails from a different galaxy near this latest one. This newer and longer set of tails was only seen because of a deeper observation with Chandra that revealed the fainter X-rays.
Researchers have discovered a second pair of tails trailing behind a galaxy in this cluster. Previously, astronomers discovered a shorter pair of tails from a different galaxy close to this latest one. This newer and longer set of tails was only seen because of a deeper observation with Chandra that revealed the fainter X-rays that have been shown in the optical data. These tails span for over a million light-years and help determine the evolution of the galaxy cluster.X-ray: NASA/CXC/Xiamen Univ./C. Ge; Optical: DESI collaboration; Image Processing: NASA/CXC/SAO/N. Wolk
Astronomers now have evidence that these streams trailing behind the speeding galaxies have crossed one another. Z8338 is a chaotic landscape of galaxies, superheated gas, and shock waves (akin to sonic booms created by supersonic jets) in one relatively small region of space. These galaxies are in motion because they were part of two galaxy clusters that collided with each other to create Z8338.
This new composite image shows this spectacle. X-rays from Chandra (represented in purple) outline the multimillion-degree gas that outweighs all of the galaxies in the cluster. The Chandra data also shows where this gas has been jettisoned behind the moving galaxies. Meanwhile an optical image from the Dark Energy Survey from the Cerro Tololo Inter-American Observatory in Chile shows the individual galaxies peppered throughout the same field of view.
The original gas tail discovered in Z8338 is about 800,000 light-years long and is seen as vertical in this image (see the labeled version). The researchers think the gas in this tail is being stripped away from a large galaxy as it travels through the galaxy cluster. The head of the tail is a cloud of relatively cool gas about 100,000 light-years away from the galaxy it was stripped from. This tail is also separated into two parts.
The team proposes that the detachment of the tail from the large galaxy may have been caused by the passage of the other, longer tail. Under this scenario, the tail detached from the galaxy because of the crossing of the streams.
The results give useful information about the detachment and destruction of clouds of cooler gas like those seen in the head of the detached tail. This work shows that the cloud can survive for at least 30 million years after it is detached. During that time, a new generation of stars and planets may form within it.
The Z8338 galaxy cluster and its jumble of galactic streams are located about 670 million light-years from Earth. A paper describing these results appeared in the Aug. 8, 2023, issue of the Monthly Notices of the Royal Astronomical Society and is available online at: https://academic.oup.com/mnras/article/525/1/1365/7239302.
NASA’s Marshall Space Flight Center manages the Chandra program. The Smithsonian Astrophysical Observatory’s Chandra X-ray Center controls science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.
Read more from NASA’s Chandra X-ray Observatory.
Learn more about the Chandra X-ray Observatory and its mission here:
Visual Description:This release features a composite image of two pairs of hot gas tails found inside a single galaxy cluster. The image is presented both labeled and unlabeled, with color-coded ovals encircling the hot gas tails.
In both the labeled and unlabeled versions of the image, mottled purple gas speckles a region of space dotted with distant flecks of red and white. Also present in this region of space are several glowing golden dots. These dots are individual galaxies that together form the cluster Zwicky 8338.
To our right of center is a glowing golden galaxy with a mottled V shaped cloud of purple above it. Yellow labels identify the two arms of the V as tails trailing behind the hurtling galaxy below.
To our left of center is another golden galaxy, this one surrounded by purple gas. Behind it, opening toward our right in the shape of a widening V lying on its side, are two more mottled purple clouds. Labeled in white, these newly-discovered gas tails are even larger than the previously discovered tails labeled in yellow. These tails, which overlap with the galaxy on our right, are over 1.6 million light-years long.
News Media ContactMegan Watzke
Chandra X-ray Center
Cambridge, Mass.
617-496-7998
Lane Figueroa
Marshall Space Flight Center, Huntsville, Alabama
256-544-0034
lane.e.figueroa@nasa.gov
Obesity-Drug Pioneers Win Prestigious Lasker Award for Medical Science
Three scientists are honored for developing a class of blockbuster weight-loss drugs. Is a Nobel prize on the way?
I am Artemis: Chris Pereira
Chris Pereira can personally attest to the immense gravitational attraction of black holes. He’s been in love with space ever since he saw a video on the topic in a high school science class.
But it wasn’t just any science class. It was one specially designed for English learners.
“I was born and raised in Guatemala,” Pereira said. “I came here at 14 unable to speak any English.”
Pereira did not know how to navigate the U.S. educational system either, but after that class, he was certain he wanted a career in space.
Thus began a journey that ultimately landed him at L3Harris Technologies, where he works in the Aerojet Rocketdyne segment as an engineer and operations integrator on the RS-25 engine – used to power the core stage of NASA’s SLS (Space Launch System) rocket that will launch astronauts to the Moon under NASA’s Artemis campaign.
Pereira’s first step was to stay after class and ask to borrow a copy of the video on black holes. His teacher not only obliged but took him across the street to the local library to get his first library card.
Pereira quickly recognized that the pathway to his desired career in space was through higher education. It was equally clear, however, that he was not yet on that pathway. English as a Second Language classes, including that science class, did not count toward college admissions. His guidance counselor, meanwhile, was nudging him toward the trades.
But with the help of teachers and a new guidance counselor, he got himself on the college-bound track.
“I came to understand there were multiple career pathways to explore my interest in space,” Pereira said “One was engineering.”
There was a lot of catching up to do, so Pereira took eight classes per day, including honors courses. He also worked every day after school cleaning a gymnasium from 6 to 11 p.m. to help his family make ends meet.
Pereira earned his mechanical engineering degree at California State University at Los Angeles while also working as a senior educator at the California Science Center to cover the cost of his college tuition and living expenses.
Pereira’s first career experience was as an intern in manufacturing engineering at Aerojet Rocketdyne. “I learned that making 100% mission-success engines requires a strong culture of attention to detail, teamwork and solid work ethics.” Pereira said. His first full-fledged engineering job was with Honeywell Aerospace working on aircraft programs.
Eventually, space came calling — literally. “My mentor at Aerojet Rocketdyne called me up and said, ‘Chris, I have a job for you,’” Pereira said.
He began his new job working on rocket engine programs including the AR1 and RS-68 but shifted to the RS-25 after NASA awarded Aerojet Rocketdyne a contract for newly manufactured versions of the engine. Initial versions of the SLS are using refurbished engines from the Space Shuttle Program. Evolved versions of the RS-25 recently concluded a critical test series and will debut with the fifth Artemis flight.
As RS-25’s operations integrator, Pereira is responsible for ensuring that the many pieces of the program – from tracking on-time procurement of supplies and labor loads to coordinating priorities on various in-demand machine centers – come together to deliver a quality product.
Playing a key role in the nation’s effort to return astronauts to the Moon feels a bit like coming home again, Pereira said. “You develop your first love, work really hard, take different pathways and encounter new passions,” he said. “It’s almost funny how the world and life work out – it’s like I’ve taken a big circle back to my first love.”
NASA is working to land the first woman, first person of color, and its first international partner astronaut on the Moon under Artemis. SLS is part of NASA’s backbone for deep space exploration, along with the Orion spacecraft, supporting ground systems, advanced spacesuits and rovers, the Gateway in orbit around the Moon, and commercial human landing systems. SLS is the only rocket that can send Orion, astronauts, and supplies to the Moon in a single launch.
Sols 4309–4310: Leaning Back, Driving Back
- Curiosity Home
- Science
- News and Features
- Multimedia
- Mars Missions
- The Solar System
3 min read
Sols 4309–4310: Leaning Back, Driving Back NASA’s Mars rover Curiosity captured this image of a large fractured slab of bedrock, taken by Right Navigation Camera onboard NASA’s Mars rover Curiosity on Sol 4307 — Martian day 4,307 of the Mars Science Laboratory Mission — on Sept. 17, 2024 at 15:50:36 UTC.
Earth planning date: Wednesday, Sept. 18, 2024
The lengthy drive planned on Monday executed as expected, and we came in today to find our rover parked at a jaunty angle on a sloped ridge. There were some worries that the slope might limit our ability to use the arm for contact science in this plan (we don’t want to do anything that might cause the rover to slide down the slope!), but after some careful consideration, we received the good news that all six of our wheels are holding on firmly to the ground, so there was no risk of slipping.
On Monday, two different options for today’s plan were laid out. The first option, a “full contact science” plan where we don’t drive, was to be executed if Monday’s drive put us exactly where we hoped. The second, a “touch-and-go” plan where we do some light contact science before driving away, was to be executed if the drive didn’t put us where we wanted to be. As it happened, the rover was a little too enthusiastic about driving, and actually put our desired workspace under its body rather than in front where the arm could reach it. There’s always a little uncertainty in the final position after such a long drive! So, we decided to stick with a touch-and-go plan that includes a tiny backwards drive of less than a metre to reposition our desired target in front of the rover.
Although we need to re-position, we aren’t slowing down on science for even a second. We are parked in front of a large fractured slab of bedrock, which can be seen in the above image. This slab became the contact science target for this plan with DRT and APXS activities on “The Minster.” Mastcam is getting a workout today as well, with large mosaics of “North Channel,” “Buckeye Ridge,” “Quinn,” and “Island Pass.” These mosaics are all documenting various aspects of the ridge we’re sat on and the edge of the Gediz Vallis Channel, including sedimentary rocks, white sulphate materials, and gravels and fine-grained materials. ChemCam is also taking a turn on the bedrock slab with a LIBS activity on “Grand Sentinel” and a mosaic of some exposed white stones off in the distance.
The second sol of the plan, after our short drive, is largely taken over by environmental science activities, though there is our usual post-drive ChemCam AEGIS. These activities include a Mastcam tau and Navcam line-of-sight to measure the amount of dust in the atmosphere around and above us, as well as a dust devil movie, suprahorizon cloud movie, and some Navcam deck monitoring to see if our driving or the wind is moving around any of the sand and dust on the rover deck. The team is also taking the usual set of REMS, RAD, and DAN observations.
Written by Conor Hayes, Graduate Student at York University
Share Details Last Updated Sep 19, 2024 Related Terms Explore More 2 min read Sols 4307-4308: Bright Rocks Catch Our EyesArticle
2 days ago
2 min read Reaching New Heights to Unravel Deep Martian History!
Article
3 days ago
5 min read Sols 4304-4006: 12 Years, 42 Drill Holes, and Now… 1 Million ChemCam Shots!
Article
6 days ago
Keep Exploring Discover More Topics From NASA Mars
Mars is the fourth planet from the Sun, and the seventh largest. It’s the only planet we know of inhabited…
All Mars Resources
Explore this collection of Mars images, videos, resources, PDFs, and toolkits. Discover valuable content designed to inform, educate, and inspire,…
Rover Basics
Each robotic explorer sent to the Red Planet has its own unique capabilities driven by science. Many attributes of a…
Mars Exploration: Science Goals
The key to understanding the past, present or future potential for life on Mars can be found in NASA’s four…
Life Might Thrive on the Surface of Earth for an Extra Billion Years
The Sun is midway through its life of fusion. It’s about five billion years old, and though its life is far from over, it will undergo some pronounced changes as it ages. Over the next billion years, the Sun will continue to brighten.
That means things will change here on Earth.
As the Sun goes about its business fusing helium into hydrogen, the ratio of hydrogen to helium in its core changes. Over time, the core slowly becomes more enriched in helium. As helium accumulates in its core, the core’s density increases, meaning protons are more closely packed together. That creates a situation where the Sun can fuse hydrogen more efficiently. After a chain reaction of processes and cause and effect, the end result is that the Sun’s luminosity increases. The Sun’s luminosity has already increased by about 30% since its formation, and the brightening will continue.
Any increase in the Sun’s luminosity can have a pronounced effect on Earth. Environmental cycles like the carbon, nitrogen, and phosphorous cycles sustain Earth’s biosphere. As the Sun becomes brighter, it will affect these cycles, including the carbonate-silicate cycle, which moderates the accumulation of carbon dioxide (CO2) in the planet’s atmosphere.
This schematic shows the relationship between the different physical and chemical processes that make up the carbonate-silicate cycle. In the upper panel, the specific processes are identified, and in the lower panel, the feedbacks associated are shown; green arrows indicate positive coupling, while yellow arrows indicate negative coupling. Image Credit: By Gretashum – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=79674633Scientists think that over the next billion years, the brightening Sun will disrupt this cycle, leading to declining CO2 levels. Plants rely on CO2 and the levels are expected to plummet, which means that complex land life would end in the next billion years.
It’s a bleak prognosis, but new research suggests it might not happen.
The new research is “Substantial extension of the lifetime of the terrestrial biosphere,” and it’s been accepted for publication in the Planetary Science Journal. It’s in pre-print now, and the lead author is R.J. Graham, a postdoctoral researcher in the Department of Geophysical Sciences at the University of Chicago.
“Approximately one billion years (Gyr) in the future, as the Sun brightens, Earth’s carbonate-silicate cycle is expected to drive CO2 below the minimum level required by vascular land plants, eliminating most macroscopic land life,” the authors write.
As stars like our Sun age, they become brighter and warmer. Image Credit: ESO/L. CalçadaAs the Sun brightens and warms the Earth’s surface, scientists expect the carbonate-silicate cycle to draw more CO2 out of the atmosphere because of carbonate-silicate weathering and carbonate burial. Rainwater is enriched with atmospheric carbon, which reacts with silicate rocks and breaks them down. The products of the chemical reactions that break them down find their way to the ocean floor, where they form carbonate minerals. As these minerals are buried, they effectively remove carbon from the atmosphere.
Normally, the cycle acts as Earth’s natural thermostat. However, higher temperatures make the reactions more efficient, meaning the carbonate-silicate cycle will remove more CO2 from the atmosphere. That’s what led scientists to conclude that the CO2 will become so low that planet life will perish. However, the authors examined these ideas and found that it may not quite work out that way.
“Here, we couple global-mean models of temperature- and CO2-dependent plant productivity for C3 and C4 plants, silicate weathering, and climate to re-examine the time remaining for terrestrial plants,” they write. C3 and C4 plants are two main plant groups that are classified based on how they perform photosynthesis and absorb carbon. They’re relevant because they respond differently to higher temperatures.
The researchers say recent data shows that the carbonate-silicate cycle isn’t as temperature-dependent as previously thought. Instead, it’s only weakly temperature-dependent and more strongly CO2-dependent. In that case, “we find that the interplay between climate, productivity, and weathering causes the future luminosity-driven CO2 decrease to slow and temporarily reverse, averting plant CO2 starvation,” they explain.
Instead of a one billion-year outlook for Earth’s plant life, the researchers say atmospheric CO2 levels will mean plants have another 1.6-1.86 billion years. When plants can no longer survive, it won’t be because of plummeting CO2 levels. Instead of CO2 starvation, it’ll be because of what scientists call the moist greenhouse transition.
When that transition happens, a planet’s atmosphere becomes saturated with water vapour as the planet warms. Since water vapour is a potent greenhouse gas, it creates a feedback loop of increased warming. Eventually, it’s simply too hot for plants to survive. The consequences don’t end there. As the Earth’s upper atmosphere becomes more saturated with water vapour, UV energy splits water apart, and the hydrogen drifts off into space. In this situation, there’s a gradual and irreversible loss of water into space.
According to the authors, Earth won’t experience this transition for between about 1.6 and 1.86 billion years.
This astronaut photograph shows the sky over the Amazon Basin during the rainy season. Image Credit: NASA“We show that recent data indicating weakly temperature-dependent silicate weathering lead to the prediction that biosphere death results from overheating, not CO2 starvation,” the authors write. “These findings suggest that the future lifespan of Earth’s complex biosphere may be nearly twice as long as previously thought.”
These results also affect our understanding of exoplanet habitability. It has to do with what are called ‘hard steps’ in the appearance and evolution of life. The hard steps model says that certain evolutionary transitions were difficult and unlikely to happen twice. Some examples are the appearance of multicellular organisms and the Cambrian explosion.
But if Earth’s biosphere has a much longer lifespan than thought, that affects the hard steps model.
“A longer future lifespan for the complex biosphere may also provide weak statistical evidence that there were fewer “hard steps” in the evolution of intelligent life than previously estimated and that the origin of life was not one of those hard steps,” the authors conclude.
If that’s the case, then exoplanet habitability could be less rare than thought.
The post Life Might Thrive on the Surface of Earth for an Extra Billion Years appeared first on Universe Today.
Jupiter-bound JUICE probe snaps photo of Earth, the moon and Uranus
Ultra-Precise Particle Measurement Narrows Pathway to ‘New Physics’
A long-awaited calculation of the W boson’s mass agrees with theory, contradicting a previous anomaly that had raised the possibility of new physics beyond the Standard Model
Evidence points to Wuhan market as source of covid-19 outbreak
Evidence points to Wuhan market as source of covid-19 outbreak
Radio pollution from SpaceX's new Starlink satellites poses threat to astronomy, scientists say
When Will That Star Dim? Amateur Planet-Chasers Got You!
A planet swings in front of its star, dimming the starlight we see. Events like these, called transits, provide us with bounties of information about exoplanets–planets around stars other than the Sun. But predicting when these special events occur can be challenging…unless you have help from volunteers.
Luckily, a collaboration of multiple teams of amateur planet-chasers, led by researcher Federico R. Noguer from Arizona State University and researchers from NASA’s Jet Propulsion Laboratory (JPL) and Goddard Space Flight Center (GSFC), has taken up the challenge. This collaboration has published the most precise physical and orbital parameters to date for an important exoplanet called WASP-77 A b. These precise parameters help us predict future transit events and are crucial for planning spacecraft observations and accurate atmospheric modeling.
“As a retired dentist and now citizen scientist for Exoplanet Watch, research opportunities like this give me a way to learn and contribute to this amazingly exciting field of astrophysics,” said Anthony Norris, a citizen scientist working on the NASA-funded Exoplanet Watch project.
The study combined amateur astronomy/citizen science data from the Exoplanet Watch and ExoClock projects, as well as the Exoplanet Transit Database. It also incorporated data from NASA’s Spitzer Space Telescope, the Hubble Space Telescope (HST), the James Webb Space Telescope (JWST), and La Silla Observatory. Exoplanet Watch invites volunteers to participate in groundbreaking exoplanet research, using their own telescopes to observe exoplanets or by analyzing data others have gathered. You may have read another recent article about how the Exoplanet Watch team helped validate a new exoplanet candidate.
WASP-77 A b is a gas giant exoplanet that orbits a Sun-like star. It’s only about 20% larger than Jupiter. But that’s where the similarities to our solar system end. This blazing hot gas ball orbits right next to its star–more than 200 times closer to its star than our Jupiter!
Want a piece of the action? Join the Exoplanet Watch project and help contribute to cutting-edge exoplanet science! Anyone can participate–participation does not require citizenship in any particular country.
Related Links:
https://iopscience.iop.org/article/10.1088/1538-3873/ad57f5
Facebook logo @DoNASAScience @DoNASAScience Share Details Last Updated Sep 19, 2024 Related Terms Explore More 4 min read NASA’s Webb Provides Another Look Into Galactic CollisionsArticle
1 day ago
4 min read NASA’s Hubble Finds More Black Holes than Expected in the Early Universe
Article
2 days ago
2 min read Hubble Examines a Spiral Star Factory
Article
6 days ago
Most effective migraine drugs revealed by review of trial data
Most effective migraine drugs revealed by review of trial data
Exoplanets Could be Hiding Their Atmospheres
Most of the exoplanets we’ve discovered orbit red dwarf stars. This isn’t because red dwarfs are somehow special, simply that they are common. About 75% of the stars in the Milky Way are red dwarfs, so you would expect red dwarf planets to be the most abundant. This also means that most habitable worlds are going to orbit these small, cool stars, and that has some significant consequences for our search for life.
To begin with, any potentially habitable red dwarf world will need to orbit their star closely, just to be warm enough for things like liquid water. The TRAPPIST-1 system I talked about yesterday is a good example of this. The three potentially habitable planets of the system orbit at a small fraction of the distance between Mercury and the Sun. This means they are at risk of things such as stellar flares, but it also means they are almost certainly tidally locked.
Tidal locking occurs when a planet or moon is so close to its companion that tidal forces cause its rotation to sync with its orbital motion. When a planet is tidally locked, one side always faces its star while the other side is forever in darkness. As you might imagine, this would mean the warm side fries while the other freezes. That’s true unless the planet were to have a good atmosphere. With a water-rich Earth-like atmosphere heat could move between the day and night sides. Weather would be strange on such a world, but a tidally locked world could be habitable, with fairly even day-side and night-side temperatures.
How clouds could make a planet appear airless. Credit: Powell, et alObserving the atmospheres of tidally locked planets is difficult, but astronomers have a trick to see whether an atmosphere exists. Rather than trying to capture an atmospheric spectra, they can simply measure the surface temperature of the planet on opposite sides. So, look at the star as the planet moves in front of it to determine the temperature of the dark side, and look at it again as the planet moves behind the star to get the light side temperature. If the dark and light sides have dramatically different temperatures, then it must not have an atmosphere. Easy-peasy. But a new study shows that isn’t necessarily true.
In this paper the authors argue that clouds on the dark side of a world could skew our data. To show this, they considered a tidally locked world with a thick atmosphere. Based on their models, the atmosphere would moderate global temperatures on the planet so that the day side is only a few dozen degrees warmer than the dark side. This is similar to the day and night extremes of a dry region on Earth. While moderate, the temperature shift would be enough to trigger the formation of thick clouds on the dark side.
In this scenario, the day side would be mostly cloudless and we would measure the warm temperature of the planet’s surface. But with a cloudy dark side we would measure temperature of the upper layer of clouds, which would be much colder. So even though surface temperatures of the planet are fairly uniform, it would appear to have an extreme temperature shift like an airless world. The authors go on to look at how observations from the JWST could distinguish between cloudy planets and those without an atmosphere, but it is clear that one simple trick in the search for habitable planets isn’t quite so simple.
Reference: Powell, Diana, Robin Wordsworth, and Karin Öberg. “Nightside Clouds on Tidally-locked Terrestrial Planets Mimic Atmosphere-Free Scenarios.” arXiv preprint arXiv:2409.07542 (2024).
The post Exoplanets Could be Hiding Their Atmospheres appeared first on Universe Today.