Posted on

What mysterious radio signal was found near the center of the Milky Way?

Astronomers from Australia have discovered a mysterious repeated radio signal near the center of the Milky Way. & Nbsp; reports this Live Science portal with & nbsp; link to & nbsp; article hosted on the preprint server & nbsp; arXiv.

What do we know about & nbsp; this radio signal?

The radio source was named ASKAP J173608.2-321635. During the period of April 2019 to the year of August 2020, the mysterious signal appeared 13 times, while it never lasted more than several weeks. The detected radio source has appeared and & nbsp; disappeared for no reason. Earlier radio telescopes did not record it. Scientists described the signal as a “ highly polarized variable radio source located close to the galactic center and having no clear analogue at multiple wavelengths. & nbsp; day disappears completely. This behavior is unique for all known celestial bodies on & nbsp; today. Therefore, the researchers think they may be dealing with a & nbsp; “ new class of objects detected by & nbsp; radio imaging. & # 39; & # 39;

“ The most surprising property of this source is & nbsp; is that she is strongly polarized. Our eye cannot distinguish between circularly polarized light and unpolarized light, but ASKAP has the equivalent of polarized sunglasses to filter it. Such sources are really rare, usually we do not find more than 10 & nbsp; from & nbsp; thousands of sources for & nbsp; an observation & raquo ;, & nbsp; & mdash; says New Atlas lead author of the study Ziteng Wang . He added that the radio signal source found turns on and off unexpectedly. “ The brightness of this source can change dramatically, decreasing over time. one day. But & nbsp; sometimes this & nbsp; can last for several weeks, & nbsp; & mdash; explains the researcher.

In & nbsp; February 2021, a mysterious radio signal also recorded the MeerKAT radio telescope in & nbsp; South Africa, and & nbsp; in & nbsp; April & nbsp; & mdash; Australian ATCA Telescope. Previously it was & nbsp; detected neither in the & nbsp; X-rays, nor in the & nbsp; observations in the & nbsp; near infrared.

According to the scientists' opinion, they could detect the so-called radio transient in the direction of the center of the Galaxy (GCRT). “ Since the source is close to the & nbsp; Galactic Center, this source could be a new GCRT. However, the chronology of the bursts of & nbsp; our source is not consistent with the chronology of the & nbsp; GCRT. In addition, the signal that they are detected at & nbsp; lower frequencies & raquo ;, & nbsp; & mdash; Wang noted. At the same time, the researchers note that not much is known about them. GCRT themselves.

How did you manage to detect the radio signal?

ASKAP J173608.2-32163 has been identified with the Australian Square Kilometer Array Pathfinder (ASKAP) radio telescope. It is one of the most sensitive radio telescopes in the world. This is at Murchison Observatory in Western Australia. The telescope scans the sky in & nbsp; looking for incoming and outgoing radio sources that can be associated with & nbsp; pulsars, magnetars, supernovae, stellar eruptions and & nbsp; others.

The signal was first received in & nbsp; April 2019 in & nbsp; variable studies and & nbsp; slow transients (VAST).

Source:
https://www.livescience.com/strange-radio-source- milky-way-center
https://newatlas.com/space/strange-radio-signal-galactic-center-askap/

Источник aif.ru

Posted on

Rescue operations at the site of a gas explosion near Yelets

Land A gas explosion in a residential building in Yelets As a result of the emergency, the entrance to a two-story building ; is collapsed. & nbsp;

Originally, & nbsp; reported & nbsp; two victims of the incident. Rescuers later removed the body of the third victim from the rubble after the explosion.

Six people were injured, including a child. Five of them were taken to hospital in a condition of moderate severity.

Look at the pictures of the emergency scene in the AiF.ru photolnet.

© Administration of the Lipetsk region

© Administration of the Lipetsk region

© Administration of Lipetsk region

© Administration of the Lipetsk region

© Administration of the Lipetsk region

© Administration of Lipetsk region

© Administration of the Lipetsk region

© Administration of Lipetsk region

© Administration of the Lipetsk region

© Administration of the Lipetsk region

© Administration of the Lipetsk region

© Administration of the Lipetsk region

© Administration de la Lipetsk region

© Administration of Lipetsk region

Источник aif.ru

Posted on

How does splashing form in the ocean?

Expert Response 0 + –

What is splash?

Splashes & mdash; these are droplets that have broken off from the surface of the water and move in a current of air, & nbsp; explains Candidate in Physics and Mathematics, Head of the IAP RAS Laboratory Daniil Sergeev .

“ In this case, droplets up to several microns in size (the unit length equals one millionth of a meter. & mdash; & nbsp; approximately Ed.) & nbsp; are completely entrained in the airflow and blown away, forming a marine aerosol, and the big ones can fall back into the water & raquo;, & mdash; & nbsp; specifies the expert.

Click to enlarge.

How are splashes formed?

Scientists identify several splash mechanisms that have been discovered in field observations and laboratory experiments.

“ The first of them, the most famous, & mdash; & nbsp; is the emergence of underwater bubbles. When the waves break, air is sucked into the water, forming bubbles. Then they float, a thin film of the bubble bursts & nbsp; and forms small splashes. Another mechanism is called in the scientific literature liquid & nbsp; ligaments or & nbsp; liquid filaments & nbsp; (translated from English & bdquo; liquid filaments & ldquo;). It is then that a net several centimeters long and about a millimeter thick is torn from the surface of the water, and one or two large drops come off the thickening at its end. She sort of stretches and gushes out, & mdash; & nbsp; explains Daniil Sergeev.

The third mechanism & nbsp; & mdash; bag-breakup (translated from English “ bag breakup '') & mdash; the scientist from the Russian Academy of Sciences calls the main one, because he combined the features of the previous two.

“ We gave it a more euphonious name: a parachute-type crushing mechanism. The bottom line is this: when breaking waves at high speed, small protuberances form on the surface of the ocean, they start to blow in the wind in small & bdquo; parachute sails & ldquo; & nbsp; & mdash; & nbsp; a thin dome-shaped film, which is surrounded by a thicker rim at the edges. When a certain critical size is reached, first a thin film of the dome bursts, forming small splashes, and then the edge breaks into several large drops, & mdash; & nbsp; Sergeyev said. & Nbsp;

What factors affect splashing?

The wind plays a major role in the formation of spray. The stronger it is, the more waves break, which contributes to the appearance of splashing, Sergeyev explains.

“ It is during stormy conditions that splashing is intensely formed. However, along with the wind speed, the acceleration of the waves is also important. The more the wave interacts with the wind, the higher the likelihood of the ridge collapsing and splashing, the expert said.

Splashes and meerschaum & mdash; & nbsp; is it the same thing?

These two phenomena are united by the fact that they often form during intense surging waves in stormy conditions. But sea foam & mdash; & nbsp; are bubbles stuck together on the surface of the water, which have not had time to burst. And the splash & mdash; & nbsp; are drops that have already fallen from the surface of the water, the scientist explained. & Nbsp;

How do scientists study splash?

Due to complex field studies, Russian scientists simulate splashing processes in the laboratory. In & nbsp; IAP RAS of Nizhny & nbsp; Novgorod & nbsp; there is a thermostratified swimming pool with high wind speed and waves. This sophisticated facility can recreate the conditions of not only a light breeze, but also a devastating hurricane with wind speeds of up to 65m/s. Daniil Sergeev informed AiF.ru about the progress of the research. & Nbsp;

“ Today, one of the key tasks in building such models is & mdash; & nbsp; to understand which parameters of the boundary layer of the atmosphere and the ocean, one has to relate the characteristics of the generation of spray: to the wind speed or to the parameters of the waves? Our idea is & mdash; & nbsp; to link it to the crashing waves, the area of ​​the sea covered in foam, the so-called 'lambs', because it is in these areas that active splash generation occurs. Now, having studied the mechanisms of spatter generation, we begin to study how these processes affect the scattering of microwave radiation. The results obtained will be of great help & nbsp; for the development of methods for operational monitoring of the state of the environment in the boundary layers of the atmosphere and the ocean, & mdash; & nbsp; Sergeev noted.

Источник aif.ru

Posted on

Will Buran be returned to Russia from Baikonur?

Even though it is possible to agree on this, questions arise. How can a huge ship be transported technologically? And what will be his future destiny?

At the beginning of September, on the website of the research and production association “ Molniya & # 39; & # 39; it was reported that the company intends to return to Russia a copy of the reusable Buran spacecraft, located on the territory of the Baikonur Cosmodrome in Kazakhstan. In the 1970s & mdash; In the 1980s, it was the NGO “ Lightning '' developed this rocket plane, which is considered a unique achievement of Russian astronautics.

In total, two Buran flight examples were fully built. The one who made the only flight in 1988 has since been in the assembly and test building at the Baikonur Cosmodrome, but in 2002 an emergency occurred there: the collapsed roof was destroyed. vessel. A second copy remained at the Cosmodrome: item 1.02 'Storm'. It was intended for automatic flight and docking at Mir station. Added to this are two technological models of the Baikonur shuttle, made for various tests. One of them is on display next to the Cosmodrome Museum.

In May of this year there was information that the storage place of “ Burana & # 39; & # 39; strangers walked in and painted it with graffiti. Roscosmos reacted strongly: it was announced that Russia would raise the question of the preservation of historical objects in Baikonur and even bring them back to Russia.

And now representatives of the NGO “ Molniya '' visited Kazakhstan. They examined the rocket plane and the model next to it in order to solve the problems of their further transportation to the territory of our country. “ Based on the results of the meeting, it was decided that the dismantling, transport and subsequent assembly of the vessel and fitting out should be carried out under the supervision of the NGO & # 39; Molniya & # 39; # 39; as a company-developer of an orbital ship & raquo;, & mdash; stated on & nbsp; s website.

A few days later, there was a verbal skirmish on Facebook. Dauren Moussa , the general manager of RKK Baikonur, which owns the copy of the flight and the model of the shuttle, wrote that he would not give Roskosmos consent to the implementation of his plan. He accused the Russian side of 'imitation of violent activity' and “unfounded speculation” on Buran export. It was answered by Dmitry Rogozin: “ You & lt; … & gt; did nothing to store them properly. & # 39; & # 39;

Roscosmos manager points out that the current shipowner is using media reports as a pretext to stir up passions and he should assess the risks of his 'bad owner' behavior. “ We look forward to the outcome of the trial, hoping that in the end '' Burany & ldquo; will find a more considerate owner or have you invest at least one tenge in the preservation of exhibits of global importance ',' & mdash; Rogozin concludes.

However, additional questions arise here. How to make Buran technologically in Russia? And what could be the future fate of this body? & Nbsp;

& # 39; Declaration of intent & bdquo; Roscosmos & ldquo; the return of the ship is surprising. How are they going to transport it? & mdash; think scientific director of the Institute for Space Policy Ivan Moiseev. & mdash; Fuselage width & bdquo; Burana & ldquo; & mdash; 5.6 meters, height & mdash; 6.2 meters. A railroad car is only about 3 meters wide. It could be barged, but barges don't go to Baikonur. In Soviet times & bdquo; Buran & ldquo; transported on the & bdquo; Mriya & ldquo;, the largest aircraft in the world in operation. But now it belongs to Ukraine, and its use for this purpose will require the consent of their president, which is extremely unlikely.

Si & bdquo; Buran & ldquo; they will still be transported, the only fate that awaits them, & mdash; stand as a monument to the greatest mistake of Soviet cosmonautics. This spaceship, which took almost 15 years and enormous resources to create, was never used for nothing.

But, most likely, this idea will be scrapped as soon as they consider how much it may cost to implement it. & # 39; & # 39; .

Источник aif.ru

Posted on

The hydrometeorological center announced the velvet season in all resorts of the Russian Federation

The scientific director of the Hydrometeorological Center of the Russian Federation Roman Vilfand said that the velvet season has started in all resorts in Russia, reports TASS.

During a conversation with the correspondent agency, the meteorologist noted that the cold snap in part of Russia is not expected in the near future.

According to him, in the Krasnodar Territory the background temperature will be 25-28 degrees Celsius, in Sochi – 25-27 degrees, in Crimea – 23 degrees.

“ It & # 39; s not too hot during the day, on summer nights, the water temperature is nice, “he added.

Earlier, the head of the Ministry of Resorts and Tourism of the Republic of Crimea, Vadim Volchenko, said that this summer the region was visited by more than 5.2 million tourists, which is one and a half times more than last summer. At the same time, the tax revenue of the tourism industry budget exceeded 2.1 billion rubles.

Источник aif.ru

Posted on

Who has Russia fought the most with?

Weekly “Arguments and Facts” № 36. How to revive local aviation? 09/08/2021 Expert response 0 + –

If counting from & nbsp; education in & nbsp; XV & nbsp; vs. From the centralized Russian state, then & nbsp; 3 & nbsp; countries with & nbsp; with whom we & nbsp; with & nbsp; and then we fought particularly often, explains historian, political scientist Yuri Bondarenko:

Poland & nbsp; & mdash; 13 & nbsp; times. From & nbsp; 1558 to & nbsp; 1939 & nbsp; The Poles won 2 & nbsp; wars and & nbsp; lost 11. The historic victory of Russian troops was against Napoleon, in whose army 100 & nbsp; a thousand fought from the Duchy of Warsaw. Polish.

Turkey & nbsp; & mdash; 12. Russo-Turkish wars have regularly taken place from & nbsp; 1568 to & nbsp; 1918 & nbsp; g. The Turks won only in & nbsp; two: in the countryside of & nbsp; Prut of Peter I & nbsp; and & nbsp; in the & nbsp; Crimean War in the & nbsp; coalition.

Sweden & nbsp; & mdash; 12. From & nbsp; 1554 to & nbsp; 1809 & nbsp; G. & nbsp; in & nbsp; 5 & ​​nbsp; wars won in Russia, in & nbsp; 2 & nbsp; & mdash; Swedish, the rest ended in a draw. As a result of the last war, Russia got Finland.

So the list is as follows :

Persia (now Iran) & nbsp; & mdash; 7. In & nbsp; period of & nbsp; 1651 (Persian campaigns on & nbsp; Sunzha ostrog) in & nbsp; 1941 & nbsp; g. (double occupancy of Iran by Great Britain and USSR) 2 & nbsp; The Persians attracted conflict and & nbsp; 5 & ​​nbsp; Are lost.

France & nbsp; & mdash; 4. Two wins, two losses. The Italian campaign of 1799 & nbsp; g became victorious. A. & nbsp; Suvorov, Patriotic War of 1812 & nbsp; g., culminating with the capture of Paris in & nbsp; 1814 & nbsp; g. The & nbsp; number of failures & mdash; Austerlitz and & nbsp; the Crimean War already mentioned.

Germany & nbsp; & mdash; 3. They fought with her (then Prussia) during the Seven Years' War (1756 & ndash; 1763). The case ended with the capture of Berlin, as well as during World War II. During the & nbsp; World War I, nor the & nbsp; Russians nor the & nbsp; Germans won the victory.

Источник aif.ru

Posted on

The ISS orbit will be corrected before the crew arrives with actress Peresild

The orbit of the ISS will be lifted 750 meters before arrival at the station of the crew with actress Yulia Peresild and director Klim Shipenko, reports TASS.

.

The orbital altitude will be adjusted to form ballistic conditions before the launch of the manned Soyuz MS-19 spacecraft. and the landing of the Soyuz MS-18.

The maneuver will be carried out using the engines of the Zvezda module of the Russian segment of the ISS. They will be on at 9:54 p.m. Moscow time and will run for 31 seconds.

After that, the station's orbital altitude above Earth will increase by 750 meters and will be 421.28 kilometers.

Recall that on the ship Soyuz MS-19 cosmonaut Anton Shkaplerov, as well as actress Yulia Peresild and director Klim Shipenko, who will shoot the world's first feature film in orbit.

Earlier it was reported that Peresild and Shipenko had passed all required exams before flying out to space. The day before, the actress also touched on the preparation program for the shooting of the film.

Источник aif.ru

Posted on

Is it legal to require a passport on deposit?

Weekly “Arguments and Facts” № 36. How to revive local aviation? 09/08/2021

I decided to rent a scooter, but they told me I have to leave my passport. Is it legal?

I. Stepanov, Chelyabinsk

Response from the expert 0 + –

“ According to & nbsp; the law, a passport can not & nbsp; be used as a guarantee, & nbsp; & mdash; declares lawyer, member of the board of directors of the International Confederation of Consumer Societies Diana Sork . & mdash; & nbsp; In addition, employees of rental establishments and & nbsp; other similar establishments, in & nbsp; in fact, do not wear & nbsp; almost no responsibility for & nbsp; the passports given to them. On the basis of & nbsp; standards of law, the pledge & nbsp; & mdash; a means of securing obligations. This is all that can be sold and & nbsp; for & nbsp; the account of the money received will compensate for the losses. The passport does not fall into this category. Similar requirements & nbsp; & mdash; an administrative offense, for & nbsp; which may even be fined.

Источник aif.ru

Posted on

Resistance forces recaptured three districts from the Taliban in Panjshir province – media

Plot to seize power by the Taliban in Afghanistan

Detachments of the National Resistance Front of Afghanistan have recaptured three districts of Panjshir province to Taliban militants *, reports the Afghanistan Times.

According to the newspaper, the militias have regained control of the districts of Dara, Abshar and Paryan, located in the northern and northeastern parts of the region.

It is also noted that as a result of fierce fighting, dozens of Taliban have been killed.

On the eve of the representative of the resistance forces, Ali Nazari said that the radicals have started to carry out ethnic cleansing in Panjshir. He also called on the international community to stop these war crimes.

Earlier, Pentagon spokesman John Kirby noted that US troops have no intention of provide military support to the Afghan rebels.

* Taliban & ndash; a terrorist organization banned on the territory of the Russian Federation.

Источник aif.ru

Posted on

Israeli air defense system intercepts missile fired from Gaza Strip

Palestinian radicals fired a rocket from the Gaza Strip into Israeli territory on Friday evening, TASS reports.

According to IDF officials, the missile was intercepted by Iron Dome air defense

Earlier in the Israeli regional council of Eshkol, on the border of the strip air raid sirens sounded to warn residents of possible rocket attacks from the Palestinian Hamas enclave in the Gaza Strip. War planes attacked the rocket production plant as well as the Khan Younis military complex.

Источник aif.ru