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A recent cosmic census has revealed an unexpected threefold rise in active black holes within dwarf galaxies, creating the most extensive database of intermediate-mass black holes recorded to date. This survey, conducted with the Dark Energy Spectroscopic Instrument (DESI) at the Mayall Telescope in Arizona, identified over 2,500 black holes in dwarf galaxies—more than triple the previously estimated number. Led by University of Utah astronomer Ragadeepika Pucha, the research team discovered that around 2 per cent of the nearly 115,000 surveyed dwarf galaxies contain black holes actively consuming matter. Previously, only 0.5 per cent of these galaxies were believed to host such black holes.

Unveiling Middleweight Black Holes in the Cosmos

The survey has also increased the number of intermediate-mass black hole candidates—those with masses between 100 and one million times that of the sun. With almost 300 new middleweight candidates identified, the known population has quadrupled from just 70. These findings are important for understanding black hole evolution, as middleweight black holes are seen as a bridge between stellar-mass black holes, formed from collapsing stars, and supermassive black holes, which are often found at the centres of larger galaxies. According to Pucha, this newly documented group of black holes offers clues into how early black holes may have evolved through gradual cosmic mergers.

Insights into Galaxy and Black Hole Co-Evolution

The unprecedented increase in detected black holes brings fresh opportunities to study the connection between galaxies and the black holes within them. As Dr Stéphanie Juneau from NOIRLab, a co-author of the study, remarks, the discovery raises fundamental questions about the evolution of galaxies and their black holes. It remains unclear whether galaxies formed first, subsequently creating black holes, or if black holes seeded galaxy growth.

Future of Cosmic Exploration with DESI

DESI’s findings open new chapters in understanding galactic evolution. Expected to release more detailed findings in 2025, the DESI project has already mapped 1.5 million galaxies, creating a vast 3D map that enables astronomers to probe dimmer galaxies that previously eluded detailed study. Astrophysicist Mallory Molina of Vanderbilt University, though not directly involved in the study, noted the transformative impact of the data, highlighting DESI’s ability to detect numerous black holes, even with basic observational tools, suggesting the potential for further discoveries.

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New 3D Map of Local Hot Bubble Reveals Interstellar Tunnel to Superbubble

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New 3D Map of Local Hot Bubble Reveals Interstellar Tunnel to Superbubble

Astronomers have crafted a detailed three-dimensional map of the Local Hot Bubble (LHB), a vast, low-density region surrounding our solar system. This bubble, filled with hot, X-ray-emitting gas, has been a subject of study since the 1970s, and recent data from the eROSITA All-Sky Survey has provided new insights into its structure and history. The eROSITA telescope, which operates as part of the Spectrum-Roentgen-Gamma (SRG) mission, has allowed astronomers to view the bubble with unprecedented clarity by observing X-ray activity from outside Earth’s geocorona.

The new map reveals intriguing temperature variations within the LHB, attributed to stellar winds and supernova explosions. These phenomena cause certain regions of the bubble to expand, providing a more dynamic picture of its evolution. A particular discovery is the identification of an “escape tunnel” directed towards the constellation Centaurus. This tunnel may be a connection to another superbubble in the galaxy, formed by active young stars.

The History of the Local Hot Bubble

The presence of the LHB has been recognised for nearly five decades, and its origins are believed to be linked to supernova activity. Early studies of the bubble were hindered by interference from X-ray emissions within Earth’s atmosphere. However, the eROSITA telescope, launched in 2019, has now provided astronomers with the cleanest X-ray data of the bubble. Michael Yeung, a researcher at the Max Planck Institute, noted that the eRASS1 data, which was collected during a period of low solar wind activity, offers the most precise view of the X-ray sky to date.

The mapping of the Milky Way’s hemisphere into around 2,000 regions has revealed a temperature difference between the Galactic North and South, with the Northern hemisphere being cooler. This discovery hints at an internal temperature disparity within the LHB.

A New Interstellar Tunnel and Its Implications

Along withtemperature variations, the eROSITA data has revealed a previously unknown interstellar tunnel pointing towards the Centaurus constellation. This tunnel appears to connect the LHB with a hot gas corridor in the galaxy, suggesting a larger network of such tunnels across interstellar space.

The team also noted the presence of dense molecular clouds at the edges of the LHB, potentially a remnant of the bubble’s formation. Gabriele Ponti, an MPE scientist, emphasised that the solar system is located in the centre of this bubble, though the Sun entered the LHB only a few million years ago – a brief moment in the Sun’s 4.6-billion-year history.

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Greek Tomb Possibly Holds Alexander the Great’s Tunic, New Study Suggests

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Greek Tomb Possibly Holds Alexander the Great's Tunic, New Study Suggests

A cloth fragment discovered in a royal tomb in Greece could be the remains of a tunic once worn by Alexander the Great, according to recent claims by Professor Emeritus Antonis Bartsiokas of Democritus University of Thrace. Found in a tomb near Vergina, a site historically tied to Macedonian royalty, this garment is now believed by Bartsiokas to have belonged not to Alexander’s father, Philip II, as previously thought, but to Alexander’s half-brother Philip III Arrhidaeus. Arrhidaeus assumed the title of king after Alexander’s death, though his capacity to rule was limited by a mental disability.

Debate Surrounding the Tomb’s Occupants and Origins

The discovery was published in Journal of Field Archaeology. The discovery of the garment was made in 1977 within a gold chest in a tomb traditionally associated with Philip II. However, Bartsiokas argues that this tomb actually houses the remains of Arrhidaeus and his wife, Eurydice, basing his conclusion on historical records, wall art in the tomb, and an analysis of the garment itself. The tunic, he asserts, may have originally belonged to Alexander but was passed down to Arrhidaeus upon Alexander’s death, symbolising continuity within the royal lineage. Testing by other scholars had previously shown that the cloth, dyed purple and containing layers of cotton and huntite, resembled garments worn by Persian kings, adding weight to Bartsiokas’ argument.

Scholars’ Mixed Responses to the Findings

Experts have responded with varied opinions on Bartsiokas’ claims. Senior researcher Hariclia Brecoulaki of Greece’s National Hellenic Research Foundation disputed Bartsiokas’ identification of the garment as a tunic, suggesting instead that it more closely resembles a scarf used to wrap bones. Additionally, Athanasia Kyriakou, director of the Vergina excavation project at Aristotle University, noted that Bartsiokas had not directly examined the materials and criticised the findings as speculative.

Other scholars provided cautious support. Professor Susan Rotroff, a classics scholar at Washington University in St. Louis, found Bartsiokas’ conclusions plausible, noting that the garment’s cotton fibres align with a timeline after Alexander’s Persian conquests. Richard Janko, a classical studies professor at the University of Michigan, described the research as intriguing but emphasised that the cotton may have reached Greece through trade routes accessible to Philip II.

The debate over the identity of the tomb’s occupants continues, but Bartsiokas’ hypothesis has spurred renewed discussion on the artefacts and their historical significance in connection with Alexander the Great.

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Father and Daughter Decode Mysterious Signal From Space: What Does It Mean?

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Father and Daughter Decode Mysterious Signal From Space: What Does It Mean?

A simulated extraterrestrial message sent from Mars to Earth in 2023 was decoded in June by Ken Chaffin and his daughter, Keli Chaffin, through nearly a year of persistent efforts. Created as part of “A Sign in Space” project by the SETI Institute, the message displays five formations of amino acids, though its meaning remains unclear. Daniela de Paulis, SETI’s artist-in-residence and a licensed radio operator, designed the project with other international scientists and artists to explore what an alien signal might resemble.

Signal Reception and Decoding Process

In May 2023, the ExoMars Trace Gas Orbiter transmitted a signal intended to simulate an alien message. This was captured by three Earth-based observatories: the Allen Telescope Array in California, the Robert C. Byrd Green Bank Telescope in West Virginia, and the Medicina Radio Astronomical Station in Italy. Released online, the raw data allowed citizen scientists worldwide to engage in decoding efforts through a community forum. Decoding required the Chaffins to use cellular automata algorithms on what appeared to be a “starmap” of white pixels, eventually revealing clusters representing amino acids.

Interpreting the Message

The Chaffins’ discovery is confirmed by the project team to represent amino acids, essential molecules in life forms. However, no interpretation has been provided for why these particular configurations might have been chosen. De Paulis and her team maintain that understanding the message’s intent is left to those examining it, in part to mimic a real-life scenario of receiving an alien transmission without guidance.

Open Interpretation and Ongoing Exploration

This simulation invites global citizen scientists to theorise about the message’s significance. Speculations range from life-forming compounds assembling in space to a simple extraterrestrial greeting. De Paulis plans to document public interpretations in a forthcoming book, recognising the difficulty in reaching a universal consensus on its meaning. Ken and Keli Chaffin, while uncertain about the precise intent, have voiced enthusiasm over their role in exploring this unique cosmic message.

For the latest tech news and reviews, follow Gadgets 360 on X, Facebook, WhatsApp, Threads and Google News. For the latest videos on gadgets and tech, subscribe to our YouTube channel. If you want to know everything about top influencers, follow our in-house Who’sThat360 on Instagram and YouTube.


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