Top charts. New arrivals. What are the current ideas describing the large-scale structure of the Universe? How do they relate to the observed facts? This book looks at both the strengths and weaknesses of the current big-bang model in explaining certain puzzling data. It arises from an international conference that brought together many of the world's leading players in cosmology. In addition to presenting individual talks, the proceedings of the resulting discussions are also recorded.
Giving a comprehensive coverage of the expanding field of cosmology, this text will be valuable for graduate students and researchers in cosmology and theoretical astrophysics. Reviews Review Policy. Published on.
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ISBN 13: 9780801884603
Jerome Drexler used 14 of these and his analytical concept of dark matter DM relationism to discover a promising candidate for dark matter, the source of ultra-high energy cosmic rays, and theories for star formation, starburst galaxies, and the emergence of DM halos. To test the validity of his discoveries, Drexler used another 11 unexplained cosmic phenomena discovered by astronomers primarily during Utilizing his same promising dark matter candidate, Drexler was able to explain in a plausible manner all 11 of these recently discovered cosmic mysteries. Drexler's research has led not only to an identification of dark matter and to plausible explanations for the 25 cosmic phenomena, but also to a deeper understanding of many aspects of the cosmos, leading to a partial decoding of the cosmos.
Mark Kidger. The universe is big. Really big.
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And it gets bigger every day. In Cosmological Enigmas, Mark Kidger weaves together history, science, and science fiction to consider questions about the bigness of space and the strange objects that lie trembling at the edge of infinity. Nancy Ellen Abrams. After a four-century rupture between science and the questions of value and meaning, this groundbreaking book presents an explosive and potentially life-altering idea: if the world could agree on a shared creation story based on modern cosmology and biologya story that has just become available it would redefine our relationship with Planet Earth and benefit all of humanity, now and into the distant future.
Written in eloquent, accessible prose and illustrated in magnificent color throughout, including images from innovative simulations of the evolving universe, this book brings the new scientific picture of the universe to life. It interprets what our human place in the cosmos may mean for us and our descendants. It offers unique insights into the potential use of this newfound knowledge to find solutions to seemingly intractable global problems such as climate change and unsustainable growth. And it explains why we need to "think cosmically, act globally" if we're going to have a long-term, prosperous future on Earth.
Unsolved Problems in Astrophysics.
Book 8. The field of astrophysics is in the midst of a technologically driven renaissance, as fundamental discoveries are being made with astonishing frequency. In the last decade, new detectors in space, on earth, and deep underground have, when coupled with the computational power of modern computers, revolutionized our knowledge and understanding of the astronomical world. This is a great time for a student of any age to become acquainted with the remarkable universe in which we live.
This volume is a collection of essays, originally presented orally to a diverse group of students and professionals, which reveal the most fertile areas for future study of astronomy and astrophysics. The emphasis of this work is on the clear description of the current state of our knowledge as a preparation for the future unraveling of the mysteries of the universe that appear today as most fundamental and most amenable to solution.
Mind Over Matter: Conversations with the Cosmos. Cole offers a wide-ranging collection of essays about the nature of nature, the universals in the universe, and the messy playfulness of great science. Cole, the Los Angeles Times science writer and columnist, always has a fresh take on cutting-edge scientific discoveries, which she makes both understandable and very human.
Reporting on physics, cosmology, mathematics, astronomy, and more, Cole's essays, culled from her popular Mind Over Matter columns, reveal the universe as simple, constant, and complex—and wholly relevant to politics, art, and every dimension of human life. Similar ebooks.
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Book However a star of sufficient mass to form such a well would be unstable and in excess of the Hayashi limit. One strong argument against them was that they implied energies that were far in excess of known energy conversion processes, including nuclear fusion. At this time, there were some suggestions that quasars were made of some hitherto unknown form of stable antimatter , and that this might account for their brightness. Others speculated that quasars were a white hole end of a wormhole. However, when accretion disc energy-production mechanisms were successfully modeled in the s, the argument that quasars were too luminous became moot and today the cosmological distance of quasars is accepted by almost all researchers.
In the s, unified models were developed in which quasars were classified as a particular kind of active galaxy, and a general consensus emerged that in many cases it is simply the viewing angle that distinguishes them from other classes, such as blazars and radio galaxies. The huge luminosity of quasars results from the accretion discs of central supermassive black holes, which can convert on the order of 10 percent of the mass of an object into energy, as compared to 0.
This mechanism also explains why quasars were more common in the early universe, as this energy production ends when the supermassive black hole consumes all of the gas and dust near it. This means that it is possible that most galaxies, including earth's native Milky Way, have gone through an active stage appearing as a quasar or some other class of active galaxy depending on black hole mass and accretion rate and are now quiescent because they lack a supply of matter to feed into their central black holes to generate radiation.
The Universe S04 E10 - Pulsars & Quasars - video dailymotion
More than , quasars are known. All observed spectra have shown considerable redshifts, ranging from 0. Therefore, all known quasars lie at great distances from earth, the closest being Mpc million ly away and the farthest being 4 Gpc 13 billion ly away. Most quasars are known to lie above 1. Although faint when seen optically, their high redshift implies that these objects lie at a great distance from earth, making quasars the most luminous objects in the known universe.
It has an average apparent magnitude of So, from a distance of 10 parsecs about 33 light-years , this object would shine in the sky about as brightly as the Sun. Quasars are found to vary in luminosity on a variety of time scales. Some vary in brightness every few months, weeks, days, or hours. This evidence has allowed scientists to theorize that quasars generate and emit their energy from a very small region, since each part of the quasar would have to be in contact with other parts on such a time scale to coordinate the luminosity variations. As such, a quasar varying on the time scale of a few weeks cannot be larger than a few light-weeks across.
Quasars exhibit many of the same properties as active galaxies: Radiation is nonthermal and some are observed to have jets and lobes like those of radio galaxies. Quasars can be observed in many parts of the electromagnetic spectrum including radio, infrared , optical, ultraviolet , X-ray , and even gamma rays. Most quasars are brightest in their rest-frame, near-ultraviolet near the angstrom Since quasars exhibit properties common to all active galaxies, the emissions from quasars can be readily compared to those of small active galaxies powered by supermassive black holes.
To create a luminosity of 10 40 W the typical brightness of a quasar , a super-massive black hole would have to consume the material equivalent of 10 stars per year.
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The brightest known quasars devour solar masses of material every year. Quasars turn on and off depending on their surroundings, and since quasars cannot continue to feed at high rates for 10 billion years, after a quasar finishes accreting the surrounding gas and dust, it becomes an ordinary galaxy. Quasars also provide some clues as to the end of the Big Bang 's reionization. More recent quasars show no absorption region, but rather their spectra contain a spiky area known as the Lyman-alpha forest. This indicates that the intergalactic medium has undergone reionization into plasma, and that neutral gas exists only in small clouds.
One other interesting characteristic of quasars is that they show evidence of elements heavier than helium , indicating that galaxies underwent a massive phase of star formation, creating population III stars between the time of the Big Bang and the first observed quasars. Light from these stars may have been observed in , using NASA's Spitzer Space Telescope, although this observation remains to be confirmed. New World Encyclopedia writers and editors rewrote and completed the Wikipedia article in accordance with New World Encyclopedia standards.
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