A Ray of Light in a Sea of Dark Matter - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook A Ray of Light in a Sea of Dark Matter write by Charles Keeton. This book was released on 2014-04-30. A Ray of Light in a Sea of Dark Matter available in PDF, EPUB and Kindle. What’s in the dark? Countless generations have gazed up at the night sky and asked this question—the same question that cosmologists ask themselves as they study the universe. The answer turns out to be surprising and rich. The space between stars is filled with an exotic substance called “dark matter” that exerts gravity but does not emit, absorb, or reflect light. The space between galaxies is rife with “dark energy” that creates a sort of cosmic antigravity causing the expansion of the universe to accelerate. Together, dark matter and dark energy account for 95 percent of the content of the universe. News reporters and science journalists routinely talk about these findings using terms that they assume we have a working knowledge of, but do you really understand how astronomers arrive at their findings or what it all means? Cosmologists face a conundrum: how can we study substances we cannot see, let alone manipulate? A powerful approach is to observe objects whose motion is influenced by gravity. Einstein predicted that gravity can act like a lens to bend light. Today we see hundreds of cases of this—instances where the gravity of a distant galaxy distorts our view of a more distant object, creating multiple images or spectacular arcs on the sky. Gravitational lensing is now a key part of the international quest to understand the invisible substance that surrounds us, penetrates us, and binds the universe together. A Ray of Light in a Sea of Dark Matter offers readers a concise, accessible explanation of how astronomers probe dark matter. Readers quickly gain an understanding of what might be out there, how scientists arrive at their findings, and why this research is important to us. Engaging and insightful, Charles Keeton gives everyone an opportunity to be an active learner and listener in our ever-expanding universe. Watch a video with Charles Keeton: Watch video now. (http://www.youtube.com/watch?v=Uc3byXNS1G0).
Matter, Dark Matter, and Anti-Matter
Matter, Dark Matter, and Anti-Matter - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Matter, Dark Matter, and Anti-Matter write by Alain Mazure. This book was released on 2011-11-16. Matter, Dark Matter, and Anti-Matter available in PDF, EPUB and Kindle. For over ten years, the dark side of the universe has been headline news. Detailed studies of the rotation of spiral galaxies, and 'mirages' created by clusters of galaxies bending the light from very remote objects, have convinced astronomers of the presence of large quantities of dark (unseen) matter in the cosmos. The most striking fact is that they seem to compromise about 95% of the matter/energy content of the universe. As for ordinary matter, although we are immersed in a sea of dark particles, including primordial neutrinos and photons from fossil cosmological radiation, both we and our environment are made of ordinary, 'baryonic' matter. Authors Mazure and Le Brun present the inventory of matter, baryonic and exotic, and investigating the nature and fate of matter's twin, anti-matter. They show how technological progress has been a result of basic research, in tandem with the evolution of new ideas, and how the combined effect of these advances might help lift the cosmic veil.
Decaying Vs. Annihilating Dark Matter in Light of a Tentative Gamma-ray Line
Decaying Vs. Annihilating Dark Matter in Light of a Tentative Gamma-ray Line - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Decaying Vs. Annihilating Dark Matter in Light of a Tentative Gamma-ray Line write by Wilfried Buchmüller. This book was released on 2012. Decaying Vs. Annihilating Dark Matter in Light of a Tentative Gamma-ray Line available in PDF, EPUB and Kindle.
Light/dark Universe, The: Light From Galaxies, Dark Matter And Dark Energy
Light/dark Universe, The: Light From Galaxies, Dark Matter And Dark Energy - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Light/dark Universe, The: Light From Galaxies, Dark Matter And Dark Energy write by Paul S Wesson. This book was released on 2008-08-20. Light/dark Universe, The: Light From Galaxies, Dark Matter And Dark Energy available in PDF, EPUB and Kindle. To the eyes of the average person and the trained scientist, the night sky is dark, even though the universe is populated by myriads of bright galaxies. Why this happens is a question commonly called Olbers' Paradox, and dates from at least 1823. How dark is the night sky is a question which preoccupies astrophysicists at the present. The answer to both questions tells us about the origin of the universe and the nature of its contents — luminous galaxies like the Milky Way, plus the dark matter between them and the mysterious dark energy which appears to be pushing everything apart. In this book, the fascinating history of Olbers' Paradox is reviewed, and the intricate physics of the light/dark universe is examined in detail. The fact that the night sky is dark (a basic astronomical observation that anybody can make) turns out to be connected with the finite age of the universe, thereby confirming some event like the Big Bang. But the space between the galaxies is not perfectly black, and data on its murkiness at various wavelengths can be used to constrain and identify its unseen constituents.
The Light/dark Universe
The Light/dark Universe - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook The Light/dark Universe write by James Martin Overduin. This book was released on 2008. The Light/dark Universe available in PDF, EPUB and Kindle. To the eyes of the average person and the trained scientist, the night sky is dark, even though the universe is populated by myriads of bright galaxies. Why this happens is a question commonly called Olbers' Paradox, and dates from at least 1823. How dark is the night sky is a question which preoccupies astrophysicists at the present. The answer to both questions tells us about the origin of the universe and the nature of its contents ? luminous galaxies like the Milky Way, plus the dark matter between them and the mysterious dark energy which appears to be pushing everything apart. In this book, the fascinating history of Olbers' Paradox is reviewed, and the intricate physics of the light/dark universe is examined in detail. The fact that the night sky is dark (a basic astronomical observation that anybody can make) turns out to be connected with the finite age of the universe, thereby confirming some event like the Big Bang. But the space between the galaxies is not perfectly black, and data on its murkiness at various wavelengths can be used to constrain and identify its unseen constituents.
