Acoustic modes in M67 cluster stars trace deepening convective envelopes
Nature, Published online: 02 April 2025; doi:10.1038/s41586-025-08760-2
Measuring acoustic oscillations in 27 stars within the M67 cluster presents evidence of a rapidly evolving convective zone as stars evolve from subgiants to red giants.X-ray Clues Reveal Destroyed Planet
This image of the Helix Nebula, released on March 4, 2025, shows a potentially destructive white dwarf at the nebula’s center: this star may have destroyed a planet. This has never been seen before – and could explain a mysterious X-ray signal that astronomers have detected from the nebula for over 40 years.
This view combines X-rays from NASA’s Chandra X-ray Observatory (magenta), optical light data from NASA’s Hubble Space Telescope (orange, light blue), infrared data from the European Southern Observatory VISTA telescope (gold, dark blue), and ultraviolet data from GALEX (purple) of the Helix Nebula. Data from Chandra indicates that this white dwarf has destroyed a very closely orbiting planet.
Image credit: X-ray: NASA/CXC/SAO/Univ Mexico/S. Estrada-Dorado et al.; Ultraviolet: NASA/JPL; Optical: NASA/ESA/STScI (M. Meixner)/NRAO (T.A. Rector); Infrared: ESO/VISTA/J. Emerson; Image Processing: NASA/CXC/SAO/K. Arcand
Tue 06 May 11:00: Steven Benner: How life could not NOT originate on rocky planets, Earth, Mars, and 100 billion others in the Milky Way Galaxy
In Person
Prebiotic chemistry these days on Earth operates on two different metaphorical “worlds”. On one, leading with the elegant work of the Sutherland, Simons, and Leverhulme teams, the focus is on surface photochemistry of molecules arising from hazy reduced atmospheres, in particular, those where nitrogen is at the oxidation level of ammonia. It has not (yet) produced a single molecule of RNA , the (proposed) informational molecule that (purportedly) initiated Darwinian evolution.
In this talk, a visitor from the other world will show how oligomeric RNA with 3’,5’-linkages 150 ± 50 nucleotides long forms as the natural outcome of “privileged” chemistry beneath redox neutral atmospheres that are transiently reduced by Vesta-to-Ceres sized impactors. On Earth, this most likely happened 4.30 ± 0.05 billion years ago.
This RNA is long enough, and stereoregular enough, to have provided catalysts to support an “RNA World”. This World invented protein translation 4.20 ±0.11 billion years ago (based on arguable molecular clocks), and was sufficiently widespread to have left isotope enriched carbon entrapped in zircons dated at 4.10 billion years ago.
The production of pentoses (like ribose, ~100 kg/km2 per year ) cannot NOT happen on such worlds, if covered by basalts that deliver borate and condensed polyphosphates. Borate and condensed polyphosphate likewise privilege post-impact steps that yield ribonucleosides, ribonucleotides, and RNA .
- Speaker: Steven Benner (FfAME Distinguished Fellow)
- Tuesday 06 May 2025, 11:00-12:00
- Venue: Battcock, Room TBA.
- Series: LCLU Coffee Meetings; organiser: Paul B. Rimmer.
Thu 03 Apr 11:00: Catriona McDonald - The Comet’s Tale: A game of chance.
In person
Comets have a long history of being observed and admired throughout human history. They have been seen as harbingers of doom, indicators of divinity, and maybe even the key to life. Through an astronomical lens, their occasional forays into near-Earth space provide a window into the far reaches of the Solar System, and a glimpse of the (relatively) pristine material that built the planets.
Understanding the extraordinary circumstances that allow humans to observe comets, and for comets to impact the Earth, requires us to consider their entire story, from birth to destruction. In this coffee talk, we will play an interactive game of chance to decide our own cometary story and assess our chances of seeding life on Earth.
With broad brushstrokes, we will paint the life story of a comet, from its formation and the dynamic production of comet reservoirs, to the processes that drive comets towards the planets. Next, we will consider how the violent impact processes affect both the comet and the prospects for delivering prebiotic feedstocks to the Earth. Finally, we will explore the long-lasting effects of such an impact on our planet.
Will any of our cometary stories end with the possible beginning of humanity’s?
- Speaker: Catriona McDonald (Cambridge IoA)
- Thursday 03 April 2025, 11:00-12:00
- Venue: Battcock, Room F17.
- Series: LCLU Coffee Meetings; organiser: Paul B. Rimmer.
Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
What’s Up: April 2025 Skywatching Tips from NASA
- Science
- Skywatching
- What’s Up: April 2025…
Enjoy observing planets in the morning and evening sky, look for Lyrid meteors, and hunt for the “faint fuzzy” wonder that is the distant and ancient city of stars known as globular cluster M3.
Skywatching HighlightsAll Month – Planet Visibility:
- Mercury: Visible for a few days in the second half of April, extremely low in the east before sunrise.
- Venus: Rising low in the east in the hour before dawn.
- Mars: Bright and easy to view after dark all month. Setting a couple of hours after midnight.
- Jupiter: Bright and easy to spot in the west after dark, setting a couple of hours after sunset.
- Saturn: Visible low in the east below Venus, before dawn in the last two weeks of April.
Daily Highlights:
April 1 & 30 – Jupiter & Crescent Moon: Find the charming pair in the west as the sky darkens, setting about 3 hours after sunset.
April 4 & 5 – Mars & Moon: The Moon, around its first quarter phase, appears near Mars in the sky for two nights.
April 24-25 – Grouping of the Moon & Three Planets: Find Venus, Saturn, and the crescent moon gathered low in the east as dawn warms the morning sky. Mercury is also visible below them for those with a clear view to the horizon.
All month – Venus: Earth’s hothouse twin planet has made the shift from an evening object to a morning sight. You’ll notice it rising low in the east before dawn, looking a little higher each morning through the month.
All month – Mars: Looking bright and reddish in color, Mars is visible high overhead after dark all month. At the start of the month it lies along a line with bright stars Procyon and Pollux, but you’ll notice it moves noticeably over the course of April (~12 degrees or the width of your outstretched fist at arm’s length).
TranscriptWhat’s Up for April? Planets at dusk and dawn, April showers, and observing a distant city of stars.
Sky chart showing Jupiter and the crescent Moon on April 1. A similar scene repeats on April 30, but with the Moon appearing above Jupiter. NASA/JPL-Caltech
First up, in the evening sky, we begin and end the month with Jupiter and the crescent Moon shining brightly together in the western sky as sunset fades. On both April 1st and 30th, you can find the charming pair about half an hour after sunset, setting about 3 hours later.
Mars is high overhead in the south on April evenings. At the start of the month, it’s directly in between bright stars Procyon and Pollux, but it moves noticeably during the month. You’ll find the first-quarter moon right next to Mars on April 4th and 5th.
Moving to the morning sky, Venus has now made the switch from an evening object to a morning one. You may start to notice it rising low in the east before dawn, looking a little higher each morning through the month.
Sky chart showing the eastern sky 45 minutes before sunrise on April 24, with Venus, Saturn and the crescent Moon forming a grouping low in the sky. Mercury might also be visible for those with a completely clear view to the horizon. NASA/JPL-Caltech
Around April 24th and 25th, you’ll find Venus, Saturn, and the crescent moon gathered low in the east as dawn warms up the morning sky. Those with a clear view to the horizon might also pick out Mercury looking bright, but very low in the sky.
April brings shooting stars as Earth passes through one the streams of comet dust that create our annual meteor showers. The Lyrids are a modest meteor shower that peaks overnight on April 21st and into the morning of the 22nd. You can expect up to 15 meteors per hour near the peak under dark skies.
The Lyrids are best observed from the Northern Hemisphere, but can be seen from south of the equator as well. View them after about 10:30pm local time until dawn, with the best viewing around 5 a.m. The waning crescent moon will rise around 3:30am, but at only 27% full, it shouldn’t interfere too much with your meteor watching. For the best experience, face roughly toward the east, lie down in a safe, dark place away from bright lights, and look straight overhead. Meteors can appear anywhere in the sky, and some Lyrids can leave bright trails that last for a few seconds after they’ve passed.
NASA studies meteors from the ground, in the air, and from orbit to forecast meteor activity and protect spacecraft, and to understand the composition of comets and asteroids throughout our solar system.
Sky chart facing east around 9pm in April 2025 showing the location of globular cluster M3. The chart depicts the cluster’s position relative to the Big Dipper and bright stars Arcturus and Cor Caroli. The Big Dipper star Megrez serves as an indicator for the brightness of Cor Caroli. For easy visibility, M3 is depicted brighter and larger than its actual appearance. NASA/JPL-Caltech
April offers a chance to observe a truly distant wonder – a globular cluster known as “M3.” It’s a vast collection of stars that lies 34,000 light-years from Earth in our galaxy’s outer reaches. Astronomer Charles Messier discovered this object in 1764, while searching for new comets. Realizing it wasn’t one, he added it to his list of interesting objects that were not comets, which today we know as Messier’s catalog.
Through binoculars, Messier 3, or M3, appears as a small, fuzzy, star-like patch of light. With a small telescope, you’ll see a more defined glow with a slightly grainy texture. And with telescopes 8 inches or larger, the cluster begins to resolve into hundreds of individual stars.
Now, globular clusters contain some of the oldest stars in the universe, often over 10 billion years old. Unlike open clusters like the Pleiades, which sit within the Milky Way’s spiral arms, globular clusters are found in the galaxy’s halo, orbiting far above and below the Milky Way’s disk. Our galaxy has around 150 confirmed globular clusters. M3 itself is probably 11 to 13 billion years old and contains around half a million stars. And it’s relatively easy to spot in April under dark skies with binoculars or a small telescope.
Finding M3 starts with the Big Dipper. Facing east, use the Dipper’s handle to “arc to Arcturus,” the fourth-brightest star in the night sky. From there, look higher in the sky to find the star Cor Caroli located here to the west of the Dipper’s handle. It’s about as bright as this star in the Dipper’s cup. M3 is located roughly a third of the way from Arcturus to Cor Caroli. With binoculars or a finder scope, sweep within this area until you spot a faint, round glow.
M3 is an excellent target for beginners and seasoned observers alike. Whether using binoculars or a telescope, you’ll be rewarded with a view of one of the oldest objects in our galaxy.
The phases of the Moon for April 2025. NASA/JPL-Caltech
Above are the phases of the Moon for April.
Stay up to date on all of NASA’s missions exploring the solar system and beyond at NASA Science. I’m Preston Dyches from NASA’s Jet Propulsion Laboratory, and that’s What’s Up for this month.
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Habitability and Biosignatures
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Old Missions, New Discoveries: NASA’s Data Archives Accelerate Science
5 min read
Old Missions, New Discoveries: NASA’s Data Archives Accelerate Science This montage of images taken by the Voyager spacecraft of the planets and four of Jupiter’s moons is set against a false-color picture of the Rosette Nebula with Earth’s moon in the foreground. Archival data from the Voyager missions continue to produce new scientific discoveries. NASA/JPL/ASU
Every NASA mission represents a leap into the unknown, collecting data that pushes the boundaries of human understanding. But the story doesn’t end when the mission concludes. The data carefully preserved in NASA’s archives often finds new purpose decades later, unlocking discoveries that continue to benefit science, technology, and society.
“NASA’s science data is one of our most valuable legacies,” said Kevin Murphy, NASA’s chief science data officer at NASA Headquarters in Washington. “It carries the stories of our missions, the insights of our discoveries, and the potential for future breakthroughs.”
NASA’s science data is one of our most valuable legacies.Kevin Murphy
Chief Science Data Officer, NASA’s Science Mission Directorate
NASA’s Science Mission Directorate manages an immense amount of data, spanning astrophysics, biological and physical sciences, Earth science, heliophysics, and planetary science. Currently, NASA’s science data holdings exceed 100 petabytes—enough to store 20 billion photos from the average modern smartphone. This volume is expected to grow significantly with new missions.
This vast amount of data enables new discoveries, connecting scientific observations together in meaningful ways. Over 50% of scientific publications rely on archived data, which NASA provides to millions of commercial, government, and scientific users.
NASA’s five science divisions — Astrophysics, Biological and Physical Sciences, Earth Science, Heliophysics, and Planetary Science — store petabytes’ worth of data in their archives that enable scientists to continually make discoveries. NASA
Managing and stewarding such massive volumes of information requires careful planning, robust infrastructure, and innovative strategies to ensure the data is accessible, secure, and sustainable. Continued support for data storage and cutting-edge technology is key to ensuring future generations of researchers can continue to explore using science data from NASA missions.
Modern technology, such as image processing and artificial intelligence, helps unlock new insights from previous observations. For example, in 1986, NASA’s Voyager 2 spacecraft conducted a historic flyby of Uranus, capturing detailed data on the planet and its environment. Decades later, in the early 2000s, scientists used advanced image processing techniques on this archival data to discover two small moons, Perdita and Cupid, which had gone unnoticed during the initial analysis.
In 2024, researchers revisited this 38-year-old archival data and identified a critical solar wind event that compressed Uranus’s magnetosphere just before the Voyager 2 flyby. This rare event, happening only about four percent of the time, provided unique insights into Uranus’s magnetic field and its interaction with space weather.
The first panel of this artist’s concept depicts how Uranus’s magnetosphere (its protective bubble) was behaving before Voyager 2’s flyby. The second panel shows that an unusual kind of solar weather was happening at the same time as the spacecraft’s flyby, giving scientists a skewed view of Uranus’s magnetosphere. The work enabled by archival Voyager data contributes to scientists’ understanding of this enigmatic planet. NASA/JPL-Caltech
NASA’s Lunar Reconnaissance Orbiter (LRO), launched in 2009, continues to provide data that reshapes our understanding of the Moon. In 2018, scientists analyzing the LRO’s archival data confirmed the presence of water ice in permanently shadowed regions at the Moon’s poles.
In 2024, new studies out of NASA’s Goddard Space Flight Center in Greenbelt, Maryland, showed widespread evidence of water ice within the permanently shadowed regions outside the lunar South Pole, further aiding lunar mission planners. This discovery not only holds implications for lunar exploration but also demonstrates how existing data can yield groundbreaking insights.
Artist rendering of the Lunar Reconnaissance Orbiter (LRO) above the Moon. LRO carries seven instruments that make comprehensive remote sensing observations of the Moon and measurements of the lunar radiation environment. Archival data from LRO continues to help scientists make discoveries about the Moon. NASA/GSFC
NASA’s data archives uncover the secrets of our own planet as well as others. In 2024, archaeologists published a study revealing a “lost” Mayan city in Campeche, Mexico that was previously unknown to the scientific community. The researchers identified the city in archival airborne Earth science data, including a 2013 dataset from NASA Goddard’s LiDAR Hyperspectral & Thermal Imager (G-LiHT) mission.
The Harmonized Landsat and Sentinel-2 (HLS) project provides frequent high-resolution observations of Earth’s surface. Data from HLS has been instrumental in tracking urban growth over time. By analyzing changes in land cover, researchers have used HLS to monitor the expansion of cities and infrastructure development. For example, in rapidly growing metropolitan areas, HLS data has revealed patterns of urban sprawl, helping planners analyze past trends to predict future metropolitan expansion.
1985 2010
NASA’s Goddard Space Flight Center
NASA’s Goddard Space Flight Center 19852010
NASA’s Goddard Space Flight Center NASA’s Goddard Space Flight Center
1985
2010
Before and After
Urban Growth in Ontario, California1985-2010
CurtainToggle2-Up
Image Details
Thirty-five miles due east of downtown Los Angeles lies the city of Ontario, California. These natural color Landsat 5 images show the massive growth of the city between 1985 and 2010. The airport, found in the southwest portion of the images, added a number of runways, and large warehousing structures now dominate the once rural areas surrounding the airport. In these images, vegetation is green and brown, while urban structures are bright white and gray. A large dry riverbed in the northeast corner is also bright white, but its nonlinear appearance sets it apart visually. Researchers use archival data from Landsat and other satellites to track the growth of cities like Ontario, CA over time.
These discoveries represent only a fraction of what’s possible. NASA is investing in new technologies to harness the full potential of its data archives, including artificial intelligence (AI) foundation models—open-source AI tools designed to extract new findings from existing science data.
“Our vision is to develop at least one AI model for each NASA scientific discipline, turning decades of legacy data into a treasure trove of discovery,” said Murphy. “By embedding NASA expertise into these tools, we ensure that our scientific data continues to drive innovation across science, industry, and society for generations to come.”
Developed under a collaboration between NASA’s Office of the Chief Science Data Officer, IBM, and universities, these AI models are scientifically validated and adaptable to new datasets, making them invaluable for researchers and industries alike.
“It’s like having a virtual assistant that leverages decades of NASA’s knowledge to make smarter, quicker decisions,” said Murphy.
On June 22, 2013, the Operational Land Imager (OLI) on Landsat 8 captured this false-color image of the East Peak fire burning in southern Colorado near Trinidad. Burned areas appear dark red, while actively burning areas look orange. Dark green areas are forests; light green areas are grasslands. Data from Landsat 8 were used to train the Prithvi artificial intelligence model, which can help detect burn scars. NASA Earth Observatory
The team’s Earth science foundation models—the Prithvi Geospatial model and Prithvi Weather model—analyze vast datasets to monitor Earth’s changing landscape, track weather patterns, and support critical decision-making processes.
Building on this success, the team is now developing a foundation model for heliophysics. This model will unlock new insights about the dynamics of solar activity and space weather, which can affect satellite operations, communication systems, and even power grids on Earth. Additionally, a model designed for the Moon is in progress, aiming to enhance our understanding of lunar resources and environments.
This investment in AI not only shortens the “data-to-discovery” timeline but also ensures that NASA’s data archives continue to drive innovation. From uncovering new planets to informing future exploration and supporting industries on Earth, the possibilities are boundless.
By maintaining extensive archives and embracing cutting-edge technologies, the agency ensures that the data collected today will continue to inspire and inform discoveries far into the future. In doing so, NASA’s legacy science data truly remains the gift that keeps on giving.
By Amanda Moon Adams
Communications Lead for the Office of the Chief Science Data Officer
- Open Science
- Artificial Intelligence (AI)
- Landsat
- Lunar Reconnaissance Orbiter (LRO)
- Voyager 2
- Voyager Program
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Thu 03 Apr 10:00: Latest upper limits on 21 cm power spectrum using MWA observations
We present the deepest upper limits achieved by the Murchison Widefield Array to date at redshifts z=6.5, z=6.8, and z=7. This study is based on observations centred at (RA = 0h, DEC = −27°), collected between 2013 and 2021. The analysis builds upon the systematic framework developed in Nunhokee et al. (2024), which employs intermediate data products for data quality assessment to minimise contamination in the targeted power spectrum region. The final power spectra are constructed from 221 hours of observations for z=6.5 and 226 hours for z=6.8 and z=7.0, using the Cosmological HI Power Spectrum Estimator. Our results provide the first evidence of a heated intergalactic medium (IGM) at redshifts z=6.5 to z=7.0. Additionally, I will discuss how these results can be improved by refining the separation of thermal noise and systematics from foregrounds, leveraging fluctuations in the probability distributions of the power spectra (Trott et al.,submitted).
- Speaker: Ridhima Nunhokee, Curtin University (Remote)
- Thursday 03 April 2025, 10:00-11:00
- Venue: SPO room + online.
- Series: 21cm Discussion Group; organiser: Harry Bevins.
Thu 10 Apr 11:30: Probing Black Hole Winds with SimBAL: Mapping the Physics of Broad Absorption Line Quasar Outflows KICC Special Seminar
Broad absorption line (BAL) quasars provide striking evidence of energetic winds driven by accreting supermassive black holes. These outflows are thought to play a crucial role in regulating black hole growth and the host star formation rate, as well as shaping the evolution of galaxies; however, their physical properties—such as radius and energetics—remain poorly constrained. Our group has developed SimBAL, a spectral synthesis tool that enables detailed, physically motivated modeling of BAL quasar spectra. It has allowed us to perform a detailed spectral analysis of a large sample of BAL quasars for the first time and to characterize multi-phase outflows in a quasar discovered at the Epoch of Reionization. I will demonstrate SimBAL’s unique strengths by discussing the results from several projects and how our group has taken a systematic approach to investigate the physics of black hole winds. Lastly, I will introduce the 4MOST–Gaia Purely Astrometric Quasar Survey, an upcoming spectroscopic survey uniquely designed to deliver the first large-scale, color-independent quasar reference sample.
KICC Special Seminar
- Speaker: Hyunseop (Joseph) Choi (Université de Montréal)
- Thursday 10 April 2025, 11:30-12:00
- Venue: Ryle Meeting Room, KICC.
- Series: Kavli Institute for Cosmology Seminars; organiser: Steven Brereton.