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Astrophysics

The galaxy M87. Artist illustration. shutterstock

New research: Why is dark matter - the main component of matter in the universe - absent in some galaxies?

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Astronomers have discovered a huge ball-shaped hole in the Milky Way galaxy, its location is shown at right. A close-up view of the hole (left) shows the Perseus (in blue) and Taurus (bull) molecular clouds (in red). Although they appear to be inside the hole and touching, new XNUMXD images of the clouds show that they border the hole and there is a great distance between them. This image was produced in a paste using WorldWide Telescope. Credit: Alyssa Goodman/Center for Astrophysics | Harvard & Smithsonian

Astronomers have discovered a huge ball-shaped hole in space

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The "hole" spans about 150 parsecs -- close to 500 light years -- and is in the sky between the constellations Perseus and Taurus (bull). The research team, which operates at the Center for Astrophysics Harvard and the Smithsonian, believe the hole was created by supernovae that exploded about ten million years ago
The galaxy clusters MACS J1341. Credit: Lead Author: NASA, ESA, Katherine E. Whitaker (UMass), Image Processing: Joseph DePasquale (STScI)

"Dead" galaxies mysteriously ran out of fuel to form stars in the early universe

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When the universe was about three billion years old, only 20% of its current age, it went through the most abundant period of star birth in its history. But when Hubble and ALMA looked at cosmic objects during this period, they found something strange: six ancient massive "dead" galaxies that had run out of the cold hydrogen gas needed to form stars
Hubble Space Telescope image of a twinkling star field containing the globular cluster ESO 520-21 (also called Plumer 6). Credit: ESA/Hubble and NASA, R. Cohen

Hubble images a densely packed twinkling star field near the center of the Milky Way

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A detailed look at the gamma-ray sky. LAT Collaboration NASA/DOE/Fermi LAT Collaboration

The mystery of the mysterious gamma radiation in the "empty sky" has been solved

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Star-forming galaxies are responsible for generating gamma rays that have not yet been attributed to a known source. The discovery may lead astrophysicists to decipher dark matter
Murchison Widefield Array Radio Telescope Photo: GOLDSMITH/MWA COLLABORATION/CURTIN UNIVERSITY

SETI: Australian researchers seek to find intelligent life on planets outside the solar system

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A simulation of a tidal disruption event, from the research of Elad Steinberg from the Hebrew University

An interaction between a black hole and a star has revealed a new type of black hole

A joint study by a pair of researchers from the Hebrew University and Arizona presents a new way to discover the location of medium-sized black holes in the universe. With the help of a reanalysis of X-ray data and observations, the researchers were able to measure for the first time the speed at which the medium-sized black hole rotates, creating an opening for further discoveries and research in the field
The center of the Milky Way. Processed image. Illustration: depositphotos.com

A strange, repeating radio signal has been detected near the center of the Milky Way

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It's not a fast radio burst, a pulsar, or a low-mass star that flares up every now and then. It is the radiating body in the radio field only for a few weeks, disappears at once, and returns again after a while. The researchers seek to understand what it is
Dyson ball around sun. Illustration: shutterstock

Advanced civilizations will be able to use Dyson balls to harvest energy from black holes

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A theoretical study suggests a way to look for Dyson balls, even if partial, that indicate their use to produce energy from black holes by an advanced alien culture. So far no such structure has been discovered
Image illustration of star orbits in a three-body star system. Prof. Hagi Peretz, Technion.

A solution to the chaotic three-body problem

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After hundreds of years: scientists have found effective solutions to the famous three-body problem - and what does this have to do with "drunken walking"?
distant solar system. Illustration: depositphotos.com

First measurement of isotopes in the atmosphere of an extrasolar planet

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An international team of astronomers has become the first research team to identify carbon isotopes in the atmosphere of a gas giant
An illustration of the appearance of Comet Omoamua based on observations by the European Southern Observatory (ESO)

Opinion/ Omri Vandel: UFOs and the Galileo project What are the chances that extraterrestrials will visit us?

According to the principle of "Occam's Razor", it is much more likely that UFOs can be explained as natural phenomena that we do not yet understand, or artificial objects of terrestrial origin, just as Umama's seemingly mysterious properties have been offered far more prosaic explanations than the alien probe speculation.
Image of Arp 195 taken by the Hubble Space Telescope, a spectacular three-sided gravitational tug of war between galaxies

Hubble captures a spectacular three-way gravitational tug of war between galaxies

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This system - named Earp 195 - appears in the Atlas of Peculiar Galaxies, a list that shows some of the weirder and wonderful galaxies in the universe
A neutron star just before merging with the black hole. Image: Carl Knox OzGrav/Swinburne University of Technology

Astronomers discovered a merger of a black hole and a neutron star, then another just ten days later

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A rare event that occurred in January 2020 still fascinates scientists, who are trying to learn about the structure of the neutron star with its help
Supernova: A composite of images from Las Combes Observatory and the Hubble Space Telescope of the electron-capture supernova SN2018zd (bright circle on the right), and the galaxy where it occurred, NGC 2146. Credit: NASA/STScI/J. DePasquale; Las Cumbres Observatory

A massive explosion in space solved a thousand-year-old mystery

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When the stars aligned: A star that ended its life in a distant galaxy and exploded with great force solved an 11th-century astronomical mystery
A jet emitted from a black hole at the center of a galaxy. Illustration: shutterstock

Why supermassive black holes keep growing at the centers of massive galaxies

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Researchers from the Hebrew University and France discovered that below the critical size there are factors that prevent black holes from swallowing gas and growing, in galaxies with a mass of more than ten million suns, the attraction is large enough to pull more and more material from the galaxy to the black hole at its center
An artist's illustration depicting a spiral galaxy in deep space (this image is for illustration only, and does not depict any galaxy). Photo: depositphotos.com

Commendation from the Foundation for Gravity Research to Prof. Asher Yehalum from Ariel who offers an alternative to dark matter

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Prof. Yaholum explained why the rotation speed of the matter in the galaxies does not decrease as you move away from the center of the galaxy starting from the outskirts, but remains the same or even increases * It is estimated that dark matter is involved in the process. According to Prof. Yahlom and his colleagues, these phenomena can be explained according to a theory known as the theory of delay - the amount of time it takes for the effect of an event in the center of the galaxy to spread to its edges.
Galaxies shaped like jellyfish. Photo courtesy of Dr. Elad Singer and Kiyun Yun - PhD student in the research group in Germany

The cosmic jellyfish project is underway, come help

Mushroom-like structures on Mars. NASA

Mushrooms on Mars? Five unproven claims for the existence of alien life

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Jupiter and one of his moons. Photo: depositphotos.com

Molecular templates that will help identify extraterrestrial life forms will be used in the next spacecraft in the solar system

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Future space exploration missions in the solar system will focus on the search for extraterrestrial life, led by Clipper Europa, which will fly to the large fair moon in 2024, but this life may not resemble life on Earth. A new analysis method of the mass spectroscopy type may allow the discovery of extraterrestrial life of the alien type
Absorption lines of iron and nickel atoms in spectroscopy of data obtained from ESO's Very Large Telescope

Vapors of heavy metals were unexpectedly found in comet Borisov that arrived outside the solar system

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A new study conducted by a Belgian research team found that the metals iron and nickel are found in the atmospheres of comets traveling in our solar system, even those far from the sun. The findings were obtained with the help of data collected from the very large telescope which is located on the Cerro Paranal mountain, at an altitude of 2,635 meters in the Atacama Desert in northern Chile
The galaxy cluster ACO S 295 imaged by the Hubble Space Telescope. Credit: ESA/Hubble and NASA, P. Pakud, D. Kua

A celebration of galaxies: 'Hubble' captures a cluster with galaxies of all shapes and sizes

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This galactic cluster boasts a variety of directions, with spiral galaxies like the one in the center of this image that are almost visible from above, and some spiral galaxies that are only visible as thin slices of light when viewed from the side. This is in addition to the gravitational lensing effect that allows viewing more distant galaxies
An atom of a radioactive element. Image: depositphotos.com

Discovery of radioactive plutonium from cosmic dust deposited on Earth confirms theories of the formation of the elements

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Traces of the radioactive plutonium were found in a deep-sea mineral in the Pacific Ocean, which is a millions-year-old archive of material from the Earth but also of cosmic dust that settles on it
The galaxy cluster RXCJ0600-2007 imaged by the NASA/ESA Hubble Space Telescope, combined with gravitational lensing images of the distant galaxy RXCJ0600-z6, 12.4 billion light-years away, observed by ALMA (shown in red). Due to the gravitational lensing effect of the galaxy cluster, the image of RXCJ0600-z6 has been intensified and magnified, appearing to be divided into three or more parts. Credit: ALMA (ESO/NAOJ/NRAO), Fujimoto et al., NASA/ESA Hubble Space Telescope

Infant galaxy in the early universe discovered with the help of a "cosmic telescope"

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Visualization of a planet similar to Earth orbiting a different sun. Image: depositphotos.com

The tripartite venture to locate planets outside the solar system

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In a first-of-its-kind project in space - Tel Aviv University will mediate between the two European Gaia spacecraft and NASA's Tess to enable easier and faster discovery of planets
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