Olbers' paradox states that given the Universe is unbounded, governed by the standard laws of physics, and populated by light sources, the night sky should be ablaze with light. Obviously this is not so. However, the paradox does not lie in nature but in our understanding of physics. A Universe with a finite age, such as follows from big-bang theor
Author: Priyamvada Natarajan Genre: Science Publisher: Yale University Press ISBN: 9780300221121 Book Pages: 288 Format: PDF, ePub & Mobi
A theoretical astrophysicist explores the ideas that transformed our knowledge of the universe over the past century. The cosmos, once understood as a stagnant place, filled with the ordinary, is now a universe that is expanding at an accelerating pace, propelled by dark energy and structured by dark matter. Priyamvada Natarajan, our guide to these ideas, is someone at the forefront of the research—an astrophysicist who literally creates maps of invisible matter in the universe. She not only explains for a wide audience the science behind these essential ideas but also provides an understanding of how radical scientific theories gain acceptance. The formation and growth of black holes, dark matter halos, the accelerating expansion of the universe, the echo of the big bang, the discovery of exoplanets, and the possibility of other universes—these are some of the puzzling cosmological topics of the early twenty-first century. Natarajan discusses why the acceptance of new ideas about the universe and our place in it has never been linear and always contested even within the scientific community. And she affirms that, shifting and incomplete as science always must be, it offers the best path we have toward making sense of our wondrous, mysterious universe. “Part history, part science, all illuminating. If you want to understand the greatest ideas that shaped our current cosmic cartography, read this book.”—Adam G. Riess, Nobel Laureate in Physics, 2011 “A highly readable, insider’s view of recent discoveries in astronomy with unusual attention to the instruments used and the human drama of the scientists.”—Alan Lightman, author of The Accidental Universe and Einstein's Dream
Author: Joan Marie Galat Genre: Juvenile Nonfiction Publisher: Red Deer Press ISBN: 0889955158 Book Pages: 72 Format: PDF, ePub & Mobi
Thirteen-year-old Joan loves the outdoors; she loves looking up at the night sky. She learns that all the light humans use is harming that beautiful natural world. Galat introduces the idea of light pollution to young scientistsNits effects on birds, animals and the dire consequences to entire ecosystems if it is not controlled.
Dark Matter: An Introduction tackles the rather recent but fast-growing subject of astroparticle physics, encompassing three main areas of fundamental physics: cosmology, particle physics, and astrophysics. Accordingly, the book discusses symmetries, conservation laws, relativity, and cosmological parameters and measurements, as well as the astrophysical behaviors of galaxies and galaxy clusters that indicate the presence of dark matter and the possible nature of dark matter distribution. This succinct yet comprehensive volume: Addresses all aspects essential to the study of dark matter Explores particle candidates for cold dark matter beyond the theory of the standard model, providing examples of basic extensions and introducing theories such as supersymmetry and extra dimensions Explains—in simple text and mathematical formulations—calculation of the freeze-out temperature of a dark matter species and its relic density Provides theoretical background for dark matter scattering off a target, event rate calculation, and dark matter annihilation essential to study direct and indirect detection of dark matter Complete with a detailed review of the latest dark matter experiments and techniques, Dark Matter: An Introduction is an ideal text for beginning researchers in the field as well as for general readers with an inquisitive mind, as the important topic of astroparticle physics is treated both pedagogically and with deeper insight.
Author: Mike Brooks Genre: Fiction Publisher: Simon and Schuster ISBN: 9781481459556 Book Pages: 368 Format: PDF, ePub & Mobi
In this debut space epic, a crew of thieves and con artists take on a job that could pay off a lot of debts in a corrupt galaxy where life is cheap and criminals are the best people in it. The Keiko is a ship of smugglers, soldiers of fortune, and adventurers travelling Earth’s colony planets searching for the next job. And they never talk about their past—until now. Captain Ichabod Drift is being blackmailed. He has to deliver a special cargo to Earth, and no one can know they’re there. It’s what they call a dark run…And it may be their last.
Author: James Martin Overduin Genre: Science Publisher: World Scientific ISBN: 9789812834416 Book Pages: 225 Format: PDF, ePub & Mobi
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.
Author: Lisa Randall Genre: Science Publisher: HarperCollins ISBN: 9780062328519 Book Pages: 432 Format: PDF, ePub & Mobi
In this brilliant exploration of our cosmic environment, the renowned particle physicist and New York Times bestselling author of Warped Passages and Knocking on Heaven’s Door uses her research into dark matter to illuminate the startling connections between the furthest reaches of space and life here on Earth. Sixty-six million years ago, an object the size of a city descended from space to crash into Earth, creating a devastating cataclysm that killed off the dinosaurs, along with three-quarters of the other species on the planet. What was its origin? In Dark Matter and the Dinosaurs, Lisa Randall proposes it was a comet that was dislodged from its orbit as the Solar System passed through a disk of dark matter embedded in the Milky Way. In a sense, it might have been dark matter that killed the dinosaurs. Working through the background and consequences of this proposal, Randall shares with us the latest findings—established and speculative—regarding the nature and role of dark matter and the origin of the Universe, our galaxy, our Solar System, and life, along with the process by which scientists explore new concepts. In Dark Matter and the Dinosaurs, Randall tells a breathtaking story that weaves together the cosmos’ history and our own, illuminating the deep relationships that are critical to our world and the astonishing beauty inherent in the most familiar things.
Author: Mike Brooks Genre: Fiction Publisher: Simon and Schuster ISBN: 9781534405455 Book Pages: 336 Format: PDF, ePub & Mobi
In the third book of the “entertaining” (Kirkus Reveiws) Keiko series, Captain Ichabod Drift and his crew find themselves in another mess as a ship-wide vacation leads to their second-in-command taken hostage by the planet’s criminal mastermind. After the riotous civil war in Dark Sky, the crew of the Keiko decides to go on vacation at an illegal gambling port for a little fun. What they don’t realize is that the casinos are run by an ex-client who didn’t get his shipment due to the war. The mob boss decides to take Tamara Rouke, the Keiko’s second-in-command, and hold her hostage until the crew raises enough money to pay him back for the lost shipment. If they don’t pay up in time, Rouke will be killed. Captain Ichabod Drift and his crew agree. But as they find a way to get the funds, one will betray everyone and one will die…