What we know about dark matter and what we have yet to discover.
Astronomical observations have confirmed dark matter's existence, but what exactly is dark matter? In What Is Dark Matter?, particle physicist Peter Fisher introduces readers to one of the most intriguing frontiers of physics. We cannot actually see dark matter, a mysterious, nonluminous form of matter that is believed to account for about 27 percent of the mass-energy balance in the universe. But we know dark matter is present by observing its ghostly gravitational effects on the behaviour and evolution of galaxies. Fisher brings readers quickly up to speed regarding the current state of the dark matter problem, offering relevant historical context as well as a close look at the cutting-edge research focused on revealing dark matter's true nature.
Could dark matter be a new type of particle - an axion or a Weakly Interacting Massive Particle (WIMP) - or something else? What have physicists ruled out so far - and why? What experimental searches are now underway and planned for the near future, in hopes of detecting dark matter on Earth or in space? Fisher explores these questions and more, illuminating what is known and unknown, and what a triumph it will be when scientists discover dark matter's identity at last.
What we know about dark matter and what we have yet to discover.
Astronomical observations have confirmed dark matter's existence, but what exactly is dark matter? In What Is Dark Matter?, particle physicist Peter Fisher introduces readers to one of the most intriguing frontiers of physics. We cannot actually see dark matter, a mysterious, nonluminous form of matter that is believed to account for about 27 percent of the mass-energy balance in the universe. But we know dark matter is present by observing its ghostly gravitational effects on the behaviour and evolution of galaxies. Fisher brings readers quickly up to speed regarding the current state of the dark matter problem, offering relevant historical context as well as a close look at the cutting-edge research focused on revealing dark matter's true nature.
Could dark matter be a new type of particle - an axion or a Weakly Interacting Massive Particle (WIMP) - or something else? What have physicists ruled out so far - and why? What experimental searches are now underway and planned for the near future, in hopes of detecting dark matter on Earth or in space? Fisher explores these questions and more, illuminating what is known and unknown, and what a triumph it will be when scientists discover dark matter's identity at last.
An intellectual history of the philosophers who grappled with the problem of evil, and the case for why pessimism still holds moral value for us today.In the seventeenth and eighteenth centuries,...
Germany, 1977. Close to death, an old man collapses and struggles to his bed. The sounds of the endless night unsettle him, triggering images, questions and memories. In What Darkness Was, Inka Parei...
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