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      "author": "acronyms",
      "body": "Hi, I found some acronyms/abbreviations in this post. This is how they expand:\n<table><tr><td><strong>Acronym</strong></td><td><strong>Explanation</strong></td></tr><tr><td><strong>GRB</strong></td><td>Gamma-Ray Burst</td></tr><tr><td><strong>LIGO</strong></td><td>Laser Interferometer Gravitational-wave Observatory</td></tr></table>\nPlease leave an up-vote if you find this comment usefull.",
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      "body": "In August of 2017, a major breakthrough occurred when scientists at the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected gravitational waves that were believed to be caused by the collision of two neutron stars. This source, known as GW170817/GRB, was the first gravitational wave (GW) event that was not caused by the merger of two black holes, and was even believed to have led to the formation of one.\n\nAs such, scientists from all over the world have been studying this event ever since to learn what they can from it. For example, according to a new study led by the McGill Space Institute and Department of Physics, GW170817/GRB has shown some rather strange behavior since the two neutron stars colliding last August. Instead of dimming, as was expected, it has been gradually growing brighter.\n\nThe study that describes the team's findings, titled \"Brightening X-Ray Emission from GW170817/GRB 170817A: Further Evidence for an Outflow\", recently appeared in The Astrophysical Journal Letters. The study was led by John Ruan of McGill University's Space Institute and included members from the Canadian Institute for Advanced Research (CIFAR), Northwestern University, and the Leicester Institute for Space and Earth Observation.\n\n![gw_label-580x256.jpg](https://steemitimages.com/DQmV7Q5hvYvWgK3jHc6KtoxchRPAcKKZ7Tx96uBNd8MF6R5/gw_label-580x256.jpg)\n\nFor the sake of their study, the team relied on data obtained by NASA's Chandra X-ray Observatory, which showed that the remnant has been brightening in the X-ray and radio wavelengths in the months since the collision took place. As Daryl Haggard, an astrophysicist with McGill University whose research group led the new study, said in a recent Chandra press release:\n\n\"Usually when we see a short gamma-ray burst, the jet emission generated gets bright for a short time as it smashes into the surrounding medium – then fades as the system stops injecting energy into the outflow. This one is different; it's definitely not a simple, plain-Jane narrow jet.\"\n\nWhat's more, these X-ray observations are consistent with radiowave data reported last month by another team of scientists, who also indicated that it was continuing to brighten during the three months since the collision. During this same period, X-ray and optical observatories were unable to monitor GW170817/GRB because it was too close to the Sun at the time.\n\nHowever, once this period ended, Chandra was able to gather data again, which was consistent with these other observations. As John Ruan explained:\n\n\"When the source emerged from that blind spot in the sky in early December, our Chandra team jumped at the chance to see what was going on. Sure enough, the afterglow turned out to be brighter in the X-ray wavelengths, just as it was in the radio.\"\n\n![gw_label-580x256.jpg](https://steemitimages.com/DQmPhrPDMTqWN7Wi3Vvq3eYhZCCZLg7ao6USJhZgmmkssFF/gw_label-580x256.jpg)\n\nThis unexpected behavior has led to a serious buzz in the scientific community, with astronomers trying to come up with explanations as to what type of physics could be driving these emissions. One theory is a complex model for neutron star mergers known as \"cocoon theory\". In accordance with this theory, the merger of two neutron stars could trigger the release of a jet that shock-heats the surrounding gaseous debris.\n\nThis hot \"cocoon\" around the jet would glow brightly, which would explain the increase in X-ray and radiowave emissions. In the coming months, additional observations are sure to be made for the sake of confirming or denying this explanation. Regardless of whether or not the \"cocoon theory\" holds up, any and all future studies are sure to reveal a great deal more about this mysterious remnant and its strange behavior.\n\nAs Melania Nynka, another McGill postdoctoral researcher and a co-author on the paper indicated, GW170817/GRB presents some truly unique opportunities for astrophysical research. \"This neutron-star merger is unlike anything we've seen before,\" she said. \"For astrophysicists, it's a gift that seems to keep on giving.\"\n\nIt is no exaggeration to say that the first-ever detection of gravitational waves, which took place in February of 2016, has led to a new era in astronomy. But the detection of two neutron stars colliding was also a revolutionary accomplishment. For the first time, astronomers were able to observe such an event in both light waves and gravitational waves.\n\nIn the end, the combination of improved technology, improved methodology, and closer cooperation between institutions and observatories is allowing scientists to study cosmic phenomena that was once merely theoretical. Looking ahead, the possibilities seem almost limitless!",
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      "body": "Hi, I found some acronyms/abbreviations in this post. This is how they expand:\n<table><tr><td><strong>Acronym</strong></td><td><strong>Explanation</strong></td></tr><tr><td><strong>ESO</strong></td><td><a href='https://en.wikipedia.org/wiki/European_Southern_Observatory'>European Southern Observatory</a>, builders of the VLT and EELT</td></tr></table>\nPlease leave an up-vote if you find this comment usefull.",
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      "body": "Researchers at Canada's McGill University have shown for the first time how existing technology could be used to directly detect life on Mars and other planets. The team conducted tests in Canada's high arctic, which is a close analog to Martian conditions. They showed how low-weight, low-cost, low-energy instruments could detect and sequence alien micro-organisms. They presented their results in the journal Frontiers in Microbiology.\n\nGetting samples back to a lab to test is a time consuming process here on Earth. Add in the difficulty of returning samples from Mars, or from Ganymede or other worlds in our Solar System, and the search for life looks like a daunting task. But the search for life elsewhere in our Solar System is a major goal of today's space science. The team at McGill wanted to show that, conceptually at least, samples could be tested, sequenced, and grown in-situ at Mars or other locations. And it looks like they've succeeded.\n\nRecent and current missions to Mars have studied the suitability of Mars for life. But they don't have the ability to look for life itself. The last time a Mars mission was designed to directly search for life was in the 1970's, when NASA's Viking 1 and 2 missions landed on the surface. No life was detected, but decades later people still debate the results of those missions.\n\n![20121101_curiosity_self-portrait_20121031_PIA16239_f537.jpg](https://steemitimages.com/DQmc8kghiBi5kFBUncHUmQqh4Cr9P1xBqHVopAjMBjEwt7k/20121101_curiosity_self-portrait_20121031_PIA16239_f537.jpg)\n\nThe Viking 2 lander captured this image of itself on the Martian surface. The Viking Landers were the last missions to directly look for life on Mars. By NASA - NASA website; description,[1] high resolution image.[2], Public Domain, https://commons.wikimedia.org/w/index.php?curid=17624\n\nBut Mars is heating up, figuratively speaking, and the sophistication of missions to Mars keeps growing. With crewed missions to Mars a likely reality in the not-too-distant future, the team at McGill is looking ahead to develop tools to search for life there. And they focused on miniature, economical, low-energy technology. Much of the current technology is too large or demanding to be useful on missions to Mars, or to places like Enceladus or Europa, both future destinations in the Search for Life.\n\n\"To date, these instruments remain high mass, large in size, and have high energy requirements. Such instruments are entirely unsuited for missions to locations such as Europa or Enceladus for which lander packages are likely to be tightly constrained.\"\n\nThe team of researchers from McGill, which includes Professor Lyle Whyte and Dr. Jacqueline Goordial, have developed what they are calling the 'Life Detection Platform (LDP).' The platform is modular, so that different instruments can be swapped out depending on mission requirements, or as better instruments are developed. As it stands, the Life Detection Platform can culture microorganisms from soil samples, assess microbial activity, and sequence DNA and RNA.\n\nThere are already instruments available that can do what the LDP can do, but they're bulky and require more energy to operate. They aren't suitable for missions to far-flung destinations like Enceladus or Europa, where sub-surface oceans might harbour life. As the authors say in their study, \"To date, these instruments remain high mass, large in size, and have high energy requirements. Such instruments are entirely unsuited for missions to locations such as Europa or Enceladus for which lander packages are likely to be tightly constrained.\"\n\nA key part of the system is a miniaturized, portable DNA sequencer called the Oxford Nanopore MiniON. The team of researchers behind this study were able to show for the first time that the MiniON can examine samples in extreme and remote environments. They also showed that when combined with other instruments it can detect active microbial life. The researches succeeded in isolatinh microbial extremophiles, detecting microbial activity, and sequencing the DNA. Very impressive indeed.\n\nThese are early days for the Life Detection Platform. The system required hands-on operation in these tests. But it does show proof of concept, an important stage in any technological development. \"Humans were required to carry out much of the experimentation in this study, while life detection missions on other planets will need to be robotic,\" says Dr Goordial.\n\n\"Humans were required to carry out much of the experimentation in this study, while life detection missions on other planets will need to be robotic.\" - Dr. J. Goordial\n\nThe system as it stands now is useful here on Earth. The same things that allow it to search for and sequence microorganisms on other worlds make it suitable for the same task here on Earth. \"The types of analyses performed by our platform are typically carried out in the laboratory, after shipping samples back from the field,\" says Dr. Goordial. This makes the system desirable for studying epidemics in remote areas, or in rapidly changing conditions where transporting samples to distant labs can be problematic.\n\nThese are very exciting times in the Search for Life in our Solar System. If, or when, we discover microbial life on Mars, Europa, Enceladus, or some other world, it will likely be done robotically, using equipment similar to the LDP.",
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      "author": "cheetah",
      "body": "Hi! I am a robot. I just upvoted you! I found similar content that readers might be interested in:\nhttps://www.universetoday.com/138292/black-hole-pushing-stars-around-globular-cluster/",
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      "body": "Astronomers have been fascinated with globular clusters ever since they were first observed in 17th century. These spherical collections of stars are among the oldest known stellar systems in the Universe, dating back to the early Universe when galaxies were just beginning to grow and evolve. Such clusters orbit the centers of most galaxies, with over 150 known to belong to the Milky Way alone.\n\nOne of these clusters is known as NGC 3201, a cluster located about 16,300 light years away in the southern constellation of Vela. Using the ESO's Very Large Telescope (VLT) at the Paranal Observatory in Chile, a team of astronomers recently studied this cluster and noticed something very interesting. According to the study they released, this cluster appears to have a black hole embedded in it.\n\nThe study appeared in the Monthly Notices of the Royal Astronomical Society under the title \"A detached stellar-mass black hole candidate in the globular cluster NGC 3201\". The study was led by Benjamin Giesers of the Georg-August-University of Göttingen and included members from Liverpool John Moores University, Queen Mary University of London, the Leiden Observatory, the Institute of Astrophysics and Space Sciences, ETH Zurich, and the Leibniz Institute for Astrophysics Potsdam (AIP).\n\n![20121101_curiosity_self-portrait_20121031_PIA16239_f537.jpg](https://steemitimages.com/DQmXSFa5jrzEcDMsHmDVLrMqUEnv9QjApcfz6FfP6pD24KQ/20121101_curiosity_self-portrait_20121031_PIA16239_f537.jpg)\n\nFor the sake of their study, the team relied on the Multi Unit Spectroscopic Explorer (MUSE) instrument on the VLT to observe NGC 3201. This instrument is unique because of the way it allows astronomers to measure the motions of thousands of far away stars simultaneously. In the course of their observations, the team found that one of the cluster's stars was being flung around at speeds of several hundred kilometers an hour and with a period of 167 days.\n\nAs Giesers explained in an ESO press release:\n\n“It was orbiting something that was completely invisible, which had a mass more than four times the Sun — this could only be a black hole! The first one found in a globular cluster by directly observing its gravitational pull.”\n\nThis finding was rather unexpected, and constitutes the first time that astronomers have been able to detect an inactive black hole at the heart of a globular cluster - meaning that it is not currently accreting matter or surrounded by a glowing disc of gas. They were also able to estimate the black hole’s mass by measuring the movements of the star around it and thus extrapolating its enormous gravitational pull.\n\nFrom its observed properties, the team determined that the rapidly-moving star is about 0.8 times the mass of our Sun and the mass of its black hole counterpart to be around 4.36 times the Sun’s mass. This put's it in the \"stellar-mass black hole\" category, which are stars that exceeds the maximum mass allowance of a neutron star, but are smaller than supermassive black holes (SMBHs) - which exist at the centers of most galaxies.\n\nThis finding is highly significant, and not just because it was the first time that astronomers have observed a stellar-mass black hole in a globular cluster. In addition, it confirms what scientists have been suspecting for a few years now, thanks to recent radio and x-ray studies of globular clusters and the detection of gravity wave signals. Basically, it indicates that black holes are more common in globular clusters than previously thought.\n\n“Until recently, it was assumed that almost all black holes would disappear from globular clusters after a short time and that systems like this should not even exist!\" said Giesers. \"But clearly this is not the case - our discovery is the first direct detection of the gravitational effects of a stellar-mass black hole in a globular cluster. This finding helps in understanding the formation of globular clusters and the evolution of black holes and binary systems - vital in the context of understanding gravitational wave sources.”\n\nThis find was also significant given that the relationship between black holes and globular clusters remains a mysterious, but highly important one. Due to their high masses, compact volumes, and great ages, astronomers believe that clusters have produced a large number of stellar-mass black holes over the course of the Universe's history. This discovery could therefore tell us much about the formation of globular clusters, black holes, and the origins of gravitational wave events.",
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