📃Scientific paper: On Cepheid distances in the $H_0$ measurement Abstract: Classical Cepheids were the first stellar standard candles and have played a crucial role for astronomical distance measurements ever since the discovery of the Leavitt law (period-luminosity relation). Enormous improvements in distance accuracy have been achieved since Hertzsprung's first application of Leavitt's law to measure the distance to the Small Magellanic Cloud in 1913, notably in very recent years thanks to a large data set of highly accurate space astrometry from the ESA mission Gaia. Complemented by homogeneous space photometry, Cepheids enable the most accurate distance estimates to galaxies hosting type-Ia supernovae up to approximately 70 Mpc distant. Here, I review the history of Cepheid distance measurements, open questions on the side of stellar astrophysics, and recent studies seeking to quantify and mitigate systematics with a view to further improve the accuracy on the Hubble constant. For example, the recently launched James Webb Space Telescope will enhance precision due to 4x lower sensitivity to source blending in crowded regions and greater sensitivity in dust-insensitive infrared bands. Future 30m-class telescopes could in principle further improve Cepheid distance measurements towards the Hubble flow, if technical challenges related to a continuously evolving instrument can be overcome. ;Comment: 20 pages plus references. Finalized in early October 2023. To appear as a chapter in the Book "The Hubble Constant Tension", edited by E. Di ... Continued on ES/IODE ➡️ https://etcse.fr/eB6Yl ------- If you find this interesting, feel free to follow, comment and share. We need your help to enhance our visibility, so that our platform continues to serve you.
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3-D Map of the Cosmos ...... DESI has made the largest 3-D map of our universe to date. Earth is at the center of this thin slice of the full map. In the magnified section, it is easy to see the underlying structure of matter in our universe. (Credit: Claire Lamman/DESI collaboration) We now have the largest 3-D map of our cosmos ever created, thanks to a powerful instrument mounted atop a telescope in Arizona with a robotic array of 5,000 fiber-optic “eyes” that look into the night sky. Over the last five years, the Dark Energy Spectroscopic Instrument—known in science circles as DESI—has measured the spectra of more than 30 million galaxies and 3 million quasars to determine how fast the universe expanded over 11 billion years. DESI’s announcement today is the result of an ongoing international collaboration comprising more than 900 researchers from over 70 institutions, including astronomers at UC Santa Cruz with leadership roles in the project. https://lnkd.in/deBcbZ49
First results from DESI make the most precise measurement of our expanding universe
news.ucsc.edu
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Lambda Cold Dark Matter, or ΛCDM, has been for many years the standard cosmology model. However, the multiple contradictions with observations, including the recent pictures taken by the Webb space telescope, are reducing the credibility of the theory, which postulates an undetectable substance called dark matter in a futile effort to explain some anomalies, but not all of them. Alternative models are proposed to explain those anomalies. My favorite is Quantised Inertia, but there are others such as MoND. Now The University of Alabama in Huntsville (UAH) has published a paper proposing an alternative theory to ΛCDM, decoupling gravity from mass.
UAH Research Suggests Gravity Without Mass Could Eliminate Need for Dark Matter
spacedaily.com
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"Top 62 Women in Aviation & Aerospace to follow on Linkedin" Disruption DeepTech NewSpace NewSpaceEconomy Web3 RWAs Crypto Blockchain Digital SustainableWorld - Only for information , No trading & No investment advice
"It's still just a plan, but a new telescope could soon be measuring gravitational waves. Gravitational waves are something like the sound waves of the universe. They are created, for example, when black holes or neutron stars collide. The future gravitational wave detector, the Einstein Telescope, will use the latest laser technology to better understand these waves and, thus, our universe. One possible location for the construction of this telescope is the border triangle of Germany, Belgium and the Netherlands. How the universe makes gold... Gravitational wave detectors open a new chapter in astronomy... Our 'ears' to the universe... The Einstein Telescope... Detectors in Europe and around the world..." Fraunhofer-Institut für Lasertechnik ILT read & learn more
Einstein Telescope could launch a new era in astronomy
phys.org
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Meet “Amaterasu”: Astronomers detect highest energy cosmic ray since 1991 https://buff.ly/3uzo3xK A groundbreaking discovery has been made by astronomers with the detection of the highest energy cosmic ray since 1991. Named "Amaterasu", this cosmic ray has provided valuable insights into the mysteries of our universe. Understanding the nature and origin of cosmic rays is crucial for unraveling the secrets of the universe. "Amaterasu" surpasses any cosmic ray observed in the past three decades, making its detection particularly significant. Advanced cosmic ray detectors have made this discovery possible, providing valuable information about cosmic ray flux, energy spectrum, and composition. The discovery of "Amaterasu" opens up new avenues for research in high-energy astrophysics, allowing scientists to delve deeper into the study of cosmic rays and explore the mechanisms that accelerate particles to extreme energies. This knowledge can have practical applications in improving spacecraft design and protecting astronauts from cosmic radiation during space missions. Overall, the detection of "Amaterasu" represents a significant milestone in our quest to understand the universe and highlights the importance of ongoing research in this field. #cosmicrays #astronomy #astrophysics #highenergyphysics #cosmicraydetection #universe #Amaterasu #space #particlephysics #research
Meet “Amaterasu”: Astronomers detect highest energy cosmic ray since 1991
arstechnica.com
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As a Research Fellow at the University of Melbourne I have been analysing observations from the James Webb Space Telescope to investigate galaxies in the early Universe. My latest research on a massive interacting galaxy in the first 500 Myr of the Universe has just been published with Springer Nature Group in Nature Astronomy. Find a copy of the journal manuscript here: https://lnkd.in/gGxXjTUD To accompany this publication I have written an article in Pursuit to explain my research to non-astronomers. A few headlines: 🎖 In the Top 20 most distant astronomical objects ever confirmed ☀ Brightest, and tied most Massive among galaxies in the first 500 Myr after the Big Bang 🔭 JWST imaging reveals this is object is in fact two galaxies merging together 🔎 JWST spectroscopy reveals two populations of stars and mature chemical enrichment ⁉ Stars formation was more more efficient in the early Universe than our models predicted
Once just a speck of light, now revealed as the biggest known galaxy in the early Universe
pursuit.unimelb.edu.au
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Through the Looking Glass: Astronomers Unveil Strong Magnetic Fields Spiraling at the Edge of Milky Way’s Central Black Hole March 27, 2024 A new image from the Event Horizon Telescope (EHT) collaboration has uncovered strong and organized magnetic fields spiraling from the edge of the supermassive black hole Sagittarius A* (Sgr A*). Seen in polarized light for the first time, this new view of the monster lurking at the heart of the Milky Way Galaxy has revealed a magnetic field structure strikingly similar to that of the black hole at the center of the M87 galaxy, suggesting that strong magnetic fields may be common to all black holes. This similarity also hints toward a hidden jet in Sgr A*. The results were published today in The Astrophysical Journal Letters. Scientists unveiled the first image of Sgr A*— which is approximately 27,000 light-years away from Earth— in 2022, revealing that while the Milky Way’s supermassive black hole is more than a thousand times smaller and less massive than M87’s, it looks remarkably similar. This made scientists wonder whether the two shared common traits outside of their looks. To find out, the team decided to study Sgr A* in polarized light. Previous studies of light around M87* revealed that the magnetic fields around the black hole giant allowed it to launch powerful jets of material back into the surrounding environment.
Astronomers Unveil Strong Magnetic Fields Spiraling at the Edge of Milky Way’s Central Black Hole
eventhorizontelescope.org
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🌌 ESA's Euclid Mission Unveils First Full-Colour Images of the Cosmos European Space Agency - ESA's groundbreaking Euclid mission has released its first full-colour images of the cosmos, marking a significant milestone in our understanding of the universe. Named after the ancient Greek "father of geometry," the Euclid satellite is on a mission to produce the world's largest, most accurate 3D map of the universe, with time as the third dimension. Key Highlights from Euclid's Journey: 🌌 The €1bn probe will monitor more than a third of the sky and billions of galaxies over a six-year journey. 🌠 The mission aims to explore the influence of dark matter and dark energy on the formation of the universe. 📸 Equipped with one of the most precise telescopes ever sent to space, Euclid's cameras capture the cosmos in visible light and measure distances between galaxies. Astronomical Breakthroughs: 🌐 The Perseus Cluster of galaxies and the Horsehead Nebula are among the first images captured, showcasing Euclid's ability to rapidly image a vast stretch of sky. 🌀 The Spiral galaxy IC 342, also known as the "Hidden Galaxy," and the Globular cluster NGC 6397, are revealed in unprecedented detail. 🌌 The irregular galaxy NGC 6822 provides insights into the foundations of spiral galaxies like the Milky Way. Euclid's Impact on Astronomy: 🧐 These images are a revolution for astronomy, offering a new level of detail and depth in astronomical imaging. 📚 The data collected will contribute to a series of scientific papers, enhancing our understanding of the universe's evolution. 🔗 Check out the fascinating snapshots of our cosmos here: https://smpl.is/8dm5c Are you a #startup, #investor or industry player passionate about #NewSpace? Follow Einstein Industries Ventures to stay updated on the latest innovations and breakthroughs in our #space! #EinsteinIV #startups #space #spacetech #innovation #technology #venturecapital #funds #investors #VC #lp #ESA #EuclidMission #SpaceExploration #Astronomy #DarkUniverse #Cosmos #SpaceTech #EuropeanSpaceAgency #Galaxies #Universe
'Dark universe’ spacecraft reveals first colour images of the cosmos
thenextweb.com
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Observing the first dust storm generated by a Type 1a supernova. Researchers led by Wang Lingzhi from the South America Center for Astronomy of the Chinese Academy of Sciences, have observed for the first time how a Type 1a supernova can produce cosmic dust storms. The researchers monitored supernova SN 2018evt for over three years using both space-based and ground-based facilities. Among the former were the Spitzer Space Telescope and NEOWISE missions, and among the later, the Las Cumbres Observatory's global network of telescopes, and other facilities in China, South America, and Australia. During the monitoring, they noticed that its light began to dim precipitously in the optical wavelengths, and then started glowing brighter in infrared light. This was a telltale sign that dust was being created in the circumstellar gas after it cooled following the supernova shock wave passing through it. The findings have been published in Nature Astronomy (9 February, 2024). https://lnkd.in/dJkfpAXx #physics #physicsnews #astrophysics #astronomy #supernovae #supernova #sn2018evt
Researchers discover cosmic dust storms from Type 1a supernova
phys.org
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🔭 Indian Scientists Revolutionize the Thirty Meter Telescope with Open-Source Tool! 🌟 Indian scientists have made a groundbreaking contribution to the Thirty Meter Telescope (TMT) by developing an open-source tool to enhance its Adaptive Optics System (AOS) 🌌. This will create a comprehensive star catalogue, allowing the TMT to generate sharper astronomical images by counteracting atmospheric distortion in real-time 🌠. 🛠️ Key Highlights: - 🌍 Adaptive Optics System (AOS): Uses deformable mirrors and computers to correct atmospheric turbulence - ⭐ Natural Guide Stars (NGS): Requires feedback from bright reference stars to measure and correct image blurring - 💡 Laser Guide Star (LGS): Enhanced by NFIRAOS on TMT 📍TMT Installation: - Located at Maunakea, Hawaii 🏝️ - Developed by the TMT International Observatory LLC (TIO) - Involves international partners: USA, Japan, India, Canada 🌐 📉 Ground-Based Astronomy: - Cost-effective and easier to maintain than space telescopes - Includes major projects like the Giant Magellan Telescope and European Southern Observatory 🔬 👏 Kudos to the Indian Institute of Astrophysics (IIA), Inter-University Center for Astronomy and Astrophysics (IUCAA), and Aryabhatta Research Institute for Observational Sciences (ARIES) for their collaborative efforts! Explore the endless possibilities of HAPPENING AROUND YOU! 🌠 If you like this article, follow for more LATEST updates and share your thoughts below! 👇 #Astronomy #TMT #Innovation #Science #Space #Research #India #AI #ML #IIT #IISC #ISRO #Astrophysics #Optics #GroundBasedAstronomy #TechInnovation #STEM #ScientificResearch #GlobalCollaboration
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Observing the Omega How do the ELT (Extremely Large Telescope) and VLT (Very Large Telescope help us understand the Stars, Creation, and the Universe? The ESO Very Large Telescope (VLT) during observations. In this picture, taken from the VLT platform looking north-northwest at twilight, the four 8.2-meter Unit Telescopes (UTs) are visible. From left to right, Antu, Kueyen, Melipal, and Yepun are the Mapuche names for the VLT's giant telescopes. In front of the UTs are the four 1.8-meter Auxiliary Telescopes (ATs), entirely dedicated to interferometry, a technique that allows astronomers to see details up to 25 times finer than with individual telescopes. The configuration of the ATs can be changed by moving them across the platform between 30 different observing positions. One of these positions is in the foreground, covered by a hexagonal pad. A reddish laser beam is being launched from UT4 (Yepun) to create an artificial star at an altitude of 90 km in the Earth´s mesosphere. This Laser Guide Star (LGS) is part of the Adaptive Optics system, which allows astronomers to remove the effects of atmospheric turbulence, producing images almost as sharp as if the telescope were in space. The bluish compact group of stars visible to the right of the laser beam is the Pleiades open cluster. That artificial star creation by the VLT 90km high in our atmosphere allowed us to see the actual creation in action: " A black hole exploded or overspun into a Star." From darkness came light. From nothing Life was created. I am amazed at how science is proving the Ancient Texts were right! Not Mythology. But our Universe and Creation's History. Stay tuned for the last part at the beginning. And yes, The beginning shall be like the End. and the End like the Beginning. Next, understanding the Alpha, the beginning at CERN, and how what we see in the sky, the infinite or the Universe, is replicated in the minuscule particles. Within our atoms exist mini black holes, vortexes, and the life energy that comes and goes. This applies to technology because we use and recycle everything around us in a universal spin or loop we are continuously evolving, creating and learning, if only we could take our trash out? The trash are the impure particles in this cycle of life. At one point the Universe, a brightest sun goes dim and that is when the garbage is taken out, it is burned by fire, and that is the rebirth of a star being created out of that dark hole. So, in Technology, the trash is the redundant data, the past knowledge. The corporation has over 500 apps running continuously to manage its operations. We have been layering technology solutions and apps like a hoarder. When we need to lighten the load and see the light, be light. Empty but Full. AI is a medicine that allows under certain conditions like Self-control and Ethical behavior regeneration. David Gilden Reuven Cohen Alisée de Tonnac #intelligence #astronomy #technology #AI #Blockchain
Astronomers see a massive black hole awaken in real time
eso.org
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