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Author: Larry Krumenaker Publisher: The Rosen Publishing Group ISBN: 9781404203952 Category : Science Languages : en Pages : 188
Book Description
Presents a collection of essays that examines the characteristics and life cycles of stars, and analyzes how stars are formed, what goes on during the life of a star, and what happens when stars die.
Author: Larry Krumenaker Publisher: The Rosen Publishing Group ISBN: 9781404203952 Category : Science Languages : en Pages : 188
Book Description
Presents a collection of essays that examines the characteristics and life cycles of stars, and analyzes how stars are formed, what goes on during the life of a star, and what happens when stars die.
Author: Mike Inglis Publisher: Springer Science & Business Media ISBN: 144710059X Category : Science Languages : en Pages : 246
Book Description
Stellar evolution - the birth, development and death of stars - is central to our current understanding of astronomy, but surprisingly the majority of amateur astronomers lack a full understanding of the physics of stars. Current books on the market tend to be highly theoretical and off-putting, in Observer's Guide to Stellar Evolution, Mike Inglis brings this subject to life in a unique way. By combining a step-by-step introduction with suggestions for practical observations of stars at different stages in their evolution, amateur astronomers regardless of their current level of knowledge, will find this book fascinating and informative. -Accessible to every amateur astronomer, regardless of background knowledge. -Step-by-step introduction to the theory of stellar evolution. -Includes many examples of stars at different stages in their evolution, that the reader can observe for him/herself. -Mathematics is made accessible by being presented in 'boxes'that readers can skip over if they prefer!
Author: Charles River Publisher: ISBN: Category : Languages : en Pages : 76
Book Description
*Includes pictures *Includes a bibliography for further reading When people look up into the night sky, the stars seem fixed and immutable, as unchanging as the darkness of space itself, but the truth is that stars are born, live and die in a never-ending cycle of creation and annihilation. These cycles stretch over such vast spans of time that, to short-lived humans, they seem to last forever. No one knows just how many stars there are, but their number is almost beyond comprehension. When people look up into the night sky, they can see further than they might guess: up to 19 quadrillion miles, the distance to Deneb in Cygnus, a star that is visible from most inhabited parts of Earth. In total, around five thousand stars are visible to the naked eye, though only around two thousand are visible at any one time from a particular place on Earth. All the visible stars are bigger and brighter than the Sun. Of course, there are many more known stars than those that can be seen with the naked eye. Astronomers estimate that in the Milky Way, there may be more than three hundred billion stars, and every other galaxy may have a similar number of stars. How many galaxies are there in the Universe? Again, no one is certain, but most astronomers agree that there must be many billions. Stars begin as vast clouds of dust and gas within galaxies and are known as nebulae. Due to Newton's Law of Global Attraction, the densest areas in these nebulae pull-in matter from the surrounding space. The more mass they gain, the more mass they attract. Over time, this accumulation can lead to the creation of a star. From that moment on, an eternal battle begins: gravity tends to contract the star while its growing inner pressure tends to expand it. Nebulae are stellar nurseries, the places where stars are created and an essential part of the life cycle of the Universe. Stars do not last forever. Over time they gradually lose energy and finally die. This process of the creation of new stars and the gradual death of existing stars is part of a vast, cosmic process of recycling that continues all the time. However, that raises the question of how the very first stars were formed and that in turn leads to questions about the origin of the Universe itself. However, the life cycle of stars also has a direct relationship to life here on Earth. Singer Joni Mitchell famously included the line "we are stardust" in her hit song "Woodstock." Surprisingly, it seems that she was absolutely right. In the beginning, the Universe comprised hydrogen, small quantities of helium, minuscule amounts of lithium and almost nothing else. Stars are the engines that provide the raw material from which life itself as well as stellar bodies are created. Each star is like a factory that uses nuclear fusion to convert hydrogen into helium and that in turn is used to create carbon, nitrogen, oxygen and many other elements. When a star dies, it ejects its outer layers, throwing these elements off as cosmic dust. The gravity of planets attracts and captures this dust which settles on the surface, introducing new elements. It is estimated that more than forty thousand tons of cosmic dust arrives on Earth every year and this process has continued as long as there has been a planet Earth. Some of the tiny pieces of dust (most are smaller than one-hundredth the width of a human hair) are very old indeed. Scientists have found what they call "original stardust" on meteorites and asteroids. Many of these have been drifting in space since before the Sun was created. The elements in this dust are the fundamental building-blocks of life and every living organism on Earth is created from elements that were originally produced in long-dead stars. It seems that humans and everything else on the planet really did begin as stardust.
Author: Kelly Easton Publisher: Simon and Schuster ISBN: 068983134X Category : Brothers and sisters Languages : en Pages : 216
Book Description
When Donald Justice wrote in "On a Picture by Burchfield" that "art keeps long hours," he might have been describing his own life. Although he early on struggled to find a balance between his life and art, the latter became a way of experiencing his life more deeply. He found meaning in human experience by applying traditional religious language to his artistic vocation. Central to his work was the translation of the language of devotion to a learned American vernacular. Art not only provided him with a wealth of intrinsically worthwhile experiences but also granted rich and nuanced ways of experiencing, understanding, and being in the world. For Donald Justice--recipient of some of poetry's highest laurels, including the Pulitzer Prize, the Bollingen Prize, and the Lannan Literary Award for Poetry--art was a way of life. Because Jerry Harp was Justice's student, his personal knowledge of his subject--combined with his deep understanding of Justice's oeuvre--works to remarkable advantage in For Us, What Music? Harp reads with keen intelligence, placing each poem within the precise historical moment it was written and locating it in the context of the literary tradition within which Justice worked. Throughout the text runs the narrative of Justice's life, tying together the poems and informing Harp's interpretation of them. For Us, What Music? grants readers a remarkable understanding of one of America's greatest poets.
Author: Kenneth R. Lang Publisher: ISBN: 9781139621526 Category : Stars Languages : en Pages : 372
Book Description
"In this well-illustrated text, Kenneth R. Lang explains the life cycle of stars, from the dense molecular clouds that are stellar nurseries to the enigmatic nebulae some stars leave behind in their violent ends. Free of mathematical equations and technical jargon, Lang's lively and accessible text provides physical insights into how stars such as our Sun are born, what fuels them and keeps them bright, how they evolve and the processes by which they eventually die. The book demonstrates the sheer scope and variety of stellar phenomena in the context of the universe as a whole. Boxed focus elements enhance and amplify the discussion for readers looking for more depth. Featuring more than 150 figures, including color plates, The Life and Death of Stars is a modern and up-to-date account of stars written for a broad audience, from armchair astronomers and popular science readers to students and teachers of science"--
Author: Eldridge J J Publisher: World Scientific ISBN: 1783265825 Category : Science Languages : en Pages : 360
Book Description
Stars are the fundamental observable constituents of the Universe. They are the first objects we see in the night sky, they dominate the light produced in our own and other galaxies, and nucleosynthesis in stars produces all the elements heavier than helium. A knowledge of stars and their evolution is vital to understand other astrophysical objects from accreting black holes and galaxies to the Universe itself.The structure of a star can be described mathematically by differential equations derived from the principles of hydrodynamics, electromagnetic theory, thermodynamics, quantum mechanics, atomic and nuclear physics. The basic equations of a spherical star are derived in detail at an accessible level. The topics discussed include modes of energy transport, the equation of state, the physics of the opacity sources and the nuclear reactions. Attention is also given to the virial theorem, polytropic gas spheres and homology principles and the procedure for numerical solution of the equations is outlined. This book tracks the evolution of stars from their main-sequence evolution through the exhaustion of various nuclear fuels to the end points of evolution and also introduces the topic of interacting binary stars. The aim is to take the reader from the essential underlying physical principles to the doors to current research on stellar interiors.
Author: Larry Krumenaker
Author: Larry Krumenaker
Author: Kenneth R. Lang
Author: Mike Inglis
Author: Charles River
Author: Stacia Deutsch
Author: Emily Hudd
Author: Donald A. Cooke
Author: Kelly Easton
Author: Kenneth R. Lang
Author: Eldridge J J