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Astrophysics

From the right: Prof. Eli Waxman and Prof. Avishai Gal-Yam

A star dies, a particle is born

Is the origin of a particle that landed at the South Pole in a cosmic event 700 million years old?
A space telescope image of the galaxy cluster Abell 2813 (also known as ACO 2813). Credit: ESA/Hubble and NASA, Do. Coe

A galaxy cluster that is also a giant gravitational lens

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The galaxy cluster has so much mass that it acts as a gravitational lens, causing light from more distant galaxies to bend around it. These distortions may appear in many different forms, such as long lines or arcs.
A black hole photographed in polarized light, revealing its magnetic fields. The Event Horizon Telescope Partnership (EHT)

The magnetic field of a black hole was photographed for the first time

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The scientists observed the black hole in the center of the galaxy M87 that was photographed about three years ago by optical means, and now the huge magnetic field around it has been photographed which reveals what happens when matter approaches the speed of light and part of it is swallowed up by the black hole. The writer is one of the scientists who participated in the project
The weathering process of silicate rocks is part of what is called the "carbon cycle" which preserves the temperature of the climate on the earth's surface for a long time. [Courtesy: © Universität Bern / University of Bern; Illustration: Jenny Leibundgut]

The influence of rock composition on the feasibility of life on planets outside the solar system

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Colliding neutron stars can create solar-mass black holes. Credit: Robin Dinell / Carnegie Institution for Science

What is the connection between stellar black holes and dark matter?

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When LIGO and Virgo observe more black star collisions, they may observe many small black stars. If that happens, we may have to examine this idea of ​​darker matter more carefully
The personnel of the Japanese Space Agency collect the sample capsule brought by the Yabusa 2 spacecraft. Photo: JAXA

Organic material was found on an asteroid sample returned by Yabusa 2

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Organic materials have been found on meteorites before, but Yabusa was the first time a sample of an "S-type" asteroid was observed to contain organic molecules. It even came directly from the source, and was not subjected to significant periods of time on Earth before being tested.
A wormhole - a tunnel between distant regions of the universe. Illustration: shutterstock

Physicists: The existence of (tiny) wormholes is possible

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Physicists from Germany are examining the theoretical possibility of the existence of tunnels in space-time, but only particles can pass through them, and they will immediately close
Image: The main image shows a close-up of a quasar and a jet, like the one actually in PJ352-52. In: X-ray data from the Chandra Space Telescope Credit: X-ray: NASA / CXO / JPL / T. Connor; Optical: Twin Observatory / NOIRLAB / NSF / AURA; Infrared: WM Observatory; Image: NASA / CXC / M. WEISS

A giant jet ejected from a black hole in the early universe

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The expansion of the universe over time. NASA/WMAP Science Team / Graphics: Dana Berry

Measuring the Universe's Expansion: Surprising Discrepancies Hint at Inconsistencies in the Universe's Composition

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Researchers at the Cosmic Dawn Center at the University of Copenhagen have found that the velocity measurements used to determine the expansion rate of the universe may not be reliable. As stated in the publication, this does not resolve the inconsistency, but rather hints at another inconsistency in the composition of the universe
Image: Artist's impression of the surface of the newly discovered hot super-Earth planet GLIESE 486b. With a temperature of 430 degrees Celsius, the astronomers of the CARMENES consortium expect a hot, dry Venus-like landscape interspersed with glowing rivers of lava. As far as is known, the planet's atmosphere is thin. Image: RENDERAREA RENDERAREA.COM

Earth has a hot new neighbor - and it's every astronomer's dream

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A rocky planet discovered in the constellation Virgo could change the way we look for life in the universe
A star is torn apart by a black hole and emits jets of gas and radiation. Image: NASA/JPL

Stars engulfed by a black hole release energy long after the process begins

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Dr. Asaf Haresh of the Hebrew University revealed a new and surprising phenomenon concerning the destruction of stars by black holes* so far no researcher has been able to prove that such flashes of radio radiation exist, a relatively long time after the destruction of the star. The research even proves the power of the event and the partial understanding of the scientific world on the subject. The research was published in Nature Astronomy
A black hole emits jets of particles. Image: depositphotos.com

For the first time, a neutrino particle has been detected that came to us from the vicinity of a supermassive black hole

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A group of international researchers, including from the Hebrew University and the Weizmann Institute, discovered the particle that arrived following an emission event that occurred in 2019
The Evaporative Preserver SUV. Image: NASA

Mars and beyond: How scientists are preventing Earth's bacteria from contaminating other planets

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And what does it have to do with the Genesis mission that crashed on the moon? For 50 years, government organizations adhered to the accepted rules and laws for self-defense of the solar system against terrestrial pollution. Now they are being joined by an increasing number of commercial space missions. How to enforce the law on them?
wormhole Photo: depositphotos.com

Researchers from Germany: dark matter and the problem of hierarchy explained with the help of a fifth dimension

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Researchers around the world are looking for an explanation for the mystery of dark matter and the problem of hierarchy. The two problems seem completely different, but according to researchers from Johns Gutenberg University in Germany, both can be solved with the help of a compact fifth dimension. The estimated model does not contradict the experimental data discovered in current accelerators and predicts a new particle with a mass of 30TeV that may be discovered in future accelerators
Kepler-1649c orbits the red dwarf at the center of the system. At the moment the second known planet Kepler-1649b. Image: NASA/Ames Research Center/Daniel Rutter

Prof. Omri Vandel will participate in two projects to find planets suitable for life

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The research focuses on a relatively new topic - the programming of biological life in planets orbiting red dwarfs * To verify the hypothesis, the James Webb Space Telescope, and the Israeli Ultrasat Space Telescope when they are launched, will be directed to the planets discovered by Vandel and his colleagues
A composite image of the Orion Nebula, as seen by the Hubble Space Telescope and the Spitzer Space Telescope in observations made over many years. Credit: NASA/JPL-Caltech STScI

Vortices of chaos at the heart of the Orion Nebula

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Gaseous swirls of hydrogen, sulfur and hydrocarbons cradle a collection of baby stars in this composite image of the Orio Nebula as seen by the Hubble Space Telescope and the Spitzer Space Telescope
The dusty region of the constellation Orion (a region known as the 'Sword of Orion') is illuminated in this stunning image taken from the European Space Agency's Herschel Space Laboratory. This primordial nebula is the largest and closest star-forming region to us, and is located about 1500 light-years away [Courtesy: ESA/NASA/JPL-Caltech]

The building blocks of life can form in the interstellar clouds

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An international team of researchers has shown that glycine, the simplest amino acid and an important building block of life, can be formed in the harsh conditions that exist in space
An artist's impression of a magnetar in an eruption, showing a complex structure of magnetic fields and beam emission, shown here after a crustal rupture event. Credit: McGill University Graphic Design Team

Astronomers discover a powerful short burst of radio radiation from a place relatively close to the Milky Way

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The close proximity of high-energy pulses suggests that magnetars may be the source of certain fast bursts of radio radiation

The black hole at the center of the Milky Way is slowly spinning, but what does that mean?

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The black hole at the center of the Milky Way is slowly spinning, but what does that mean?
the bullet cluster. An area with a high concentration of dark matter. From NASA's Image of the Day, 2015. Image Credit: X-ray: NASA/CXC/CfA/ M. Markevitch et al.; Lensing Map: NASA/STScI; ESO WFI; Magellan/U.Arizona/ D.Clowe et al. Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al.

A new model for dark matter opens new avenues for its search

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A new model published by researchers from Melbourne and CERN raises the possibility that dark matter is heavier than we thought until now. The researchers hope that the paper they published will encourage experimenters to look for new avenues for detecting dark matter
Prof. Reinhart Genzel at the Parnell Observatory, part of the Southern European Observatory project in Chela. PR photo, ESO

Nobel laureate Reinhart Ganzel is a great friend of Israeli science

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Says Prof. Hagai Netzer from the School of Physics and Astronomy at Tel Aviv University who wrote dozens of joint articles with Ganzel
Star S2 orbiting the black hole at the center of the galaxy - Sagittarius (Sagittarius) *A, one of the proofs for the existence of the black hole at the center of the galaxy, from the research of 2020 Nobel Prize winners Reinhart Ganzel and Andrea Gas. From Wikipedia. By ESO/M. Kornmesser - https://www.eso.org/public/images/eso1825b/ , CC BY 1825, Link

"Without the observations of Ganzel and Gas, the whole subject of black holes would have remained theoretical"

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Illustration of the galaxy and the giant black hole at its center. The black hole converts some of the matter it absorbs into energetic radiation (shaded in blue), while the galaxy continues to form new stars (purple areas). [Image credit: Michael Helfenbein/Yale University - M. Helfenbein / Yale University]

Roger Penrose and the two black hole detectors at the center of the galaxy won the Nobel Prize in Physics

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An army of fighting machines from Mars destroying England (1906) Illustration for the book "The War of the Worlds" in the Belgian edition of 1906, by the Brazilian artist Henrique Alavim Cora.

The four most promising worlds for extraterrestrial life in the solar system

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The recent discovery of possible biogenic phosphine in the clouds of Venus reminds us that at least some of the ingredients necessary for life exist elsewhere in the solar system. So where are the most promising places for extraterrestrial life?
Atmosphere of a rocky planet outside the solar system. Image: NASA

Can extraterrestrial life survive the death of a star? The Webb Space Telescope will reveal the answer

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"If rocky planets exist around white dwarfs, we should be able to detect signs of life on them in the coming years," said co-author Lisa Keltenger, associate professor of astronomy in the College of Arts and Sciences and director of the Carl Sagan Institute.
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