Researches in Japan have discovered a super-massive black hole in Milky Way Galaxy
The black hole is believed to weigh as much as 400 suns
According to studies, at least 100 million of these small black holes should exist in the Milky Way
Japan, September 5, 2017 : Astronomers have found new evidence for the existence of a mid-sized black hole, considered the missing link in the evolution of super-massive black holes.
Astronomers in Japan found the possible black hole in our own Milky Way galaxy, a long-theorized object which is bigger than the small black holes formed from a single star, but still much smaller than giant black holes such as the one at the center of the Milky Way.
Black holes are difficult to find because they do not emit any light. However, scientists can detect them by their influence on nearby objects.
The astronomers in Japan found new evidence of the so-called intermediate-mass black hole when they turned a powerful telescope in Chile’s Atacama desert on a gas cloud near the center of the Milky Way. The gases in the cloud move at unusual speeds, and the scientists believed they were being pulled by immense gravitational forces. They say the gravitational force is likely caused by a black hole measuring about 1.4 trillion kilometers across.
The findings are published in the journal Nature Astronomy.
Theoretical studies predict at least 100 million of these small black holes should exist in the Milky Way, however only about 60 have been found.
The possible mid-sized black hole is much smaller than the super massive black hole that is located in the center of the galaxy, known as Sagittarius A, which weighs as much as 400 million suns.
“This is the first detection of an intermediate-mass black hole candidate in the Milky Way galaxy,” said the study’s leader, Tomoharu Oka from Keio University, Japan.
If confirmed, the intermediate-mass black hole could help explain how supermassive black holes operate. One theory is that supermassive black holes, which are at the center of most massive galaxies, are formed when smaller black holes steadily coalesce into larger ones. However, until now no definitive evidence has existed for intermediate-mass black holes that could indicate a middle step between the small and massive black holes already detected.
Researchers say they will continue to study the intermediate-mass black hole candidate in the hope of confirming its existence. (VOA)
New York, November 9, 2017 : An international team of astronomers has made a bizarre discovery – a star that refuses to stop shining despite exploding more than once over a period of 50 years.
The explosions of stars, known as supernovae, have been observed in the thousands and in all cases they marked the death of a star.
But a new study, published in the journal Nature, challenges known theories about the death of stars. Their observations included data from Keck Observatory on Maunakea in Hawaii.
“The spectra we obtained at Keck Observatory showed that this supernova looked like nothing we had ever seen before. This, after discovering nearly 5,000 supernovae in the last two decades,” said study co-author Peter Nugent from Lawrence Berkeley National Laboratory in the US.
“While the spectra bear a resemblance to normal hydrogen-rich core-collapse supernova explosions, they grew brighter and dimmer at least five times more slowly, stretching an event which normally lasts 100 days to over two years,” Nugent said.
The supernova, named iPTF14hls, was discovered in September 2014 by the Palomar Transient Factory. At the time, it looked like an ordinary supernova.
Several months later, astronomers at Las Cumbres Observatory in the US noticed the supernova was growing brighter again after it had faded.
When astronomers went back and looked at archival data, they were astonished to find evidence of an explosion in 1954 at the same location.
This star somehow survived that explosion and exploded again in 2014.
“This supernova breaks everything we thought we knew about how they work. It’s the biggest puzzle I’ve encountered in almost a decade of studying stellar explosions,” said lead author Iair Arcavi, a NASA Einstein postdoctoral fellow at LCO and the University of California Santa Barbara.
The study calculated that the star that exploded was at least 50 times more massive than the Sun and probably much larger.
Supernova iPTF14hls may have been the most massive stellar explosion ever seen. The size of this explosion could be the reason that conventional understanding of the death of stars failed to explain this event.
Astronomers continue to monitor the supernova, which remains bright three years after it was discovered. (IANS)
New York, September 24, 2017: Researchers have found that some ultra-high energy cosmic rays that occasionally hit Earth come from a distant source outside the Milky Way.
Cosmic rays are atomic nuclei that travel through space at speeds close to that of light. Low-energy cosmic rays come from the Sun or from our own galaxy, but the origin of the highest-energy particles has been the subject of debate ever since they were first discovered fifty years ago.
Do they come from our Galaxy or from distant extragalactic objects?
The study published in the journal Science demonstrated that those cosmic rays with energies a million times greater than that of the protons accelerated in the Large Hadron Collider – the world’s largest and most powerful particle accelerator – come from much further away than from our own galaxy.
They were detected from 2004 to 2016 at the largest cosmic ray observatory ever built, the Pierre Auger Observatory in Argentina.
“We are now considerably closer to solving the mystery of where and how these extraordinary particles are created — a question of great interest to astrophysicists,” said Karl-Heinz Kampert from University of Wuppertal in Germany.
“Our observation provides compelling evidence that the sites of acceleration are outside the Milky Way,” Kampert who is spokesperson for the Auger Collaboration, which involves more than 400 scientists from 18 countries, said.
Cosmic rays are the nuclei of elements from hydrogen to iron. The highest-energy cosmic rays, those of interest in this study, only strike about once per square kilometre per year — equivalent to hitting the area of a soccer field about once per century.
Such rare particles are detectable because they create showers of secondary particles — including electrons, photons and muons – as they interact with the nuclei in the atmosphere.
These cosmic ray showers spread out, sweeping through the atmosphere at the speed of light in a disc-like structure, like a dinner plate but several kilometres in diameter.
At the Auger Observatory, the shower particles are detected through the light they produce in several of 1,600 detectors, spread over 3,000 square kilometres of western Argentina and each containing 12 tons of water.
Tracking these arrivals tells scientists the direction from which the cosmic rays came.
After racking up detections of more than 30,000 cosmic particles, the scientists found one section of the sky was producing significantly more than its share.
The probability of this happening by a random fluctuation is extremely small, the scientists said — a chance of about two in ten million.
“This result unequivocally establishes that ultra-high energy cosmic rays are not just random wanderers of our nearby universe,” Paolo Privitera of University of Chicago who heads the US groups participating in the project, said. (IANS)
Washington D.C. [USA], August 19, 2017: Hold your breath to relish the most spectacular celestial dance. This has not happened in 99 years in the USA. The sun and the moon would sketch an arc by staging a shadow dance from east coast to the west.
The most remarkable date i.e., 21 August 2017, for which we have been impatiently waiting for almost a century now, is about to arrive.
The total solar eclipse in the United States of America is about to happen. Genevieve De Messieres, Astronomy Education Program Manager at Air and Space Museum calls this month as solar eclipse, an amazing phenomenon.
WHAT MAKES THIS SOLAR ECLIPSE SO SPECIAL?
A solar eclipse occurs when a new moon moves between the earth and the sun, hindering some or all of the sun’s rays from reaching the earth.As a consequence of this celestial movement, there are four kinds of the solar eclipse that are formed. When the moon eclipses the sun, it casts two types of shadow on earth, a small darker shadow i.e., Umbra and a large darker shadow i.e., Penumbra. The Total solar eclipse can be seen in Umbra region and a partial solar eclipse in Penumbra region. The path of totality is the region where a total solar eclipse can be seen.
The most exciting news is that all the 50 states of the USA will either witness a total solar eclipse and a partial solar eclipse. A narrow strip of the country more than 110 Km wide through 14 states will experience a total eclipse. And, the rest of the country will witness a partial solar eclipse.
If you wish to know the exact regions of both the eclipse, then follow this link- Eclipse 2017
If you are in Umbra region, then pre-total solar eclipse, do not forget to astound yourself from incredible experience of glimpsing Baily’s Beads and the Diamond Ring.
Just before the total solar eclipse, when the moon has almost fully covered the sun and the sunlight still continues to peep through the valleys and mountains on the edge of the moon, at this point, you can see the light in the form of beads. These beads are known as Baily’s Beads.
Finally, the movement for which sky watchers are eagerly waiting for, the formation of the Diamond Ring, which is formed for few mini-seconds when a single bead of light remains in the sky. Once, the diamond ring disappears, the total solar eclipse is achieved.
INTERESTING FACT ABOUT THE ECLIPSE: Have you ever wondered, that the moon which is 400 times smaller in size than that of the sun, can fully cover it? The answer to this question is an interesting fact, by cosmic chance, the sun is 400 times wider than the moon, but it is also 400 times farther than the moon. Due to which, both of these celestial bodies appear the same size when watched from the earth.
FUN LOVING WAYS TO VIEW SOLAR ECLIPSE
Don’t even think of watching solar eclipse with your bare eyes, it may lead to a lost eye sight. If you are in Washington D.C., you may go to Smithsonian National Air and Space Museum(NASM), they are setting up various viewing locations by putting up a telescope in these locations.
If you can not make up to these locations, then may preferable buy only certified eclipse watching glass. NASM is also distributing these glasses. You may get one for yourself. Caution: After the eclipse, do not remove your glasses while watching towards the sky, it may give your eyes a burning sensation. First, look at the ground and then remove the glasses.
If somehow, you do not get these glasses, then are some interesting ways to view an eclipse. If you wish to enjoy these ways, then do follow each instruction properly.
TOP 10 DESTINATIONS TO WITNESS THE SPECTACULAR TOTAL SOLAR ECLIPSE
This is the territory where the total solar eclipse will occur first at 10:19 a.m. PDT and would last for 2 minutes and 4 seconds.
Snake River Valley, Idaho
Here, the timing for the total solar eclipse to begin is 11:33 a.m. MDT and it would last long for 2 minutes and 18 seconds.
Here, the timing for the total solar eclipse to begin is 11:42 a.m. MDT and it would last long for 2 minutes and 18 seconds.
Sandhills of western Nebraska
Here, the timing for the total solar eclipse to begin is 11:49 a.m. MDT and it would last long for 2 minutes and 30 seconds.
St. Joseph, Missouri
Here, the timing for the total solar eclipse to begin is 1:06 p.m. CDT and it would last long for 2 minutes and 39 seconds.
Here, the timing for the total solar eclipse to begin is 1:20 p.m. CDT and would last long for 2 minutes and 41.6 seconds.
Here, the timing for the total solar eclipse to begin is 1:24 p.m. CDT and it would last long for 2 minutes and 41.2 seconds.
Here, the timing for the total solar eclipse to begin is 1:27 p.m. CDT and it would last long for 1 minute and 57 seconds.
Great Smokey Mountains, Natl.Park
Here, the timing for the total solar eclipse to begin is 2:35 p.m. EDT and it would last long for 1 minute and 17 seconds.
Columbia, South Carolina
Here, the timing for the total solar eclipse to begin is 2:43 p.m. EDT and it would last long for 2 minutes and 30 seconds.
Moreover, NASA is also organizing various fun-filled activities at various destinations. If you wish to know about it and indulge your self in these events, then go this link- Eclipse 2017 NASA Event Locations
MAKE PROPER RESERVATIONS BEFORE YOU LEAVE
Before you pack your bags, do make proper arrangements for your stay. It would be difficult to get on the spot reservation on 21 August 2017. So, plan in advance. Also, be prepared for the traffic jams in advance.