The inside story of the epic quest to solve the mystery of dark matter The ordinary atoms that make up the known universe—from our bodies and the air we breathe to the planets and stars—constitute only 5 percent of all matter and energy in the cosmos. The rest is known as dark matter and dark energy, because their precise identities are unknown. The Cosmic Cocktail is the inside story of the epic quest to solve one of the most compelling enigmas of modern science—what is the universe made of?—told by one of today's foremost pioneers in the study of dark matter. Blending cutting-edge science with her own behind-the-scenes insights as a leading researcher in the field, acclaimed theoretical physicist Katherine Freese recounts the hunt for dark matter, from the discoveries of visionary scientists like Fritz Zwicky—the Swiss astronomer who coined the term "dark matter" in 1933—to the deluge of data today from underground laboratories, satellites in space, and the Large Hadron Collider. Theorists contend that dark matter consists of fundamental particles known as WIMPs, or weakly interacting massive particles. Billions of them pass through our bodies every second without us even realizing it, yet their gravitational pull is capable of whirling stars and gas at breakneck speeds around the centers of galaxies, and bending light from distant bright objects. Freese describes the larger-than-life characters and clashing personalities behind the race to identify these elusive particles. Many cosmologists believe we are on the verge of solving the mystery. The Cosmic Cocktail provides the foundation needed to fully fathom this epochal moment in humankind’s quest to understand the universe.

This 20th volume in the series contains 16 invited reviews and highlight contributions presented during the 2007 International Scientific Conference of the German Astronomical Society on the topic of "Cosmic Matter", held in Würzburg, Germany. The papers published here discuss a wide range of hot topics, including cosmology, high-energy astrophysics, astroparticle physics gravitational waves, extragalactic and stellar astronomy -- together representing the roadmap for astroparticle physics in Europe.

Searching for Dark Matter with Cosmic Gamma Rays summarizes the evidence for dark matter and what we can learn about its particle nature using cosmic gamma rays. It has almost been 100 years since Fritz Zwicky first detected hints that most of the matter in the Universe that doesn't directly emit or reflect light. Since then, the observational evidence for dark matter has continued to grow. Dark matter may be a new kind of particle that is governed by physics beyond our Standard Model of particle physics. In many models, dark matter annihilation or decay produces gamma rays. There are a variety of instruments observing the gamma-ray sky from tens of MeV to hundreds of TeV. Some make deep, focused observations of small regions, while others provide coverage of the entire sky. Each experiment offers complementary sensitivity to dark matter searches in a variety of target sizes, locations, and dark matter mass scales. We review results from recent gamma-ray experiments including anomalies some have attributed to dark matter. We also discuss how our gamma-ray observations complement other dark matter searches and the prospects for future experiments.

From a star theoretical physicist, a journey into the world of particle physics and the cosmos—and a call for a more liberatory practice of science. Winner of the 2021 Los Angeles Times Book Prize in Science & Technology A Finalist for the 2022 PEN/E.O. Wilson Literary Science Writing Award A Smithsonian Magazine Best Science Book of 2021 A Symmetry Magazine Top 10 Physics Book of 2021 An Entropy Magazine Best Nonfiction Book of 2020-2021 A Publishers Weekly Best Nonfiction Book of the Year A Kirkus Reviews Best Nonfiction Book of 2021 A Booklist Top 10 Sci-Tech Book of the Year In The Disordered Cosmos, Dr. Chanda Prescod-Weinstein shares her love for physics, from the Standard Model of Particle Physics and what lies beyond it, to the physics of melanin in skin, to the latest theories of dark matter—along with a perspective informed by history, politics, and the wisdom of Star Trek. One of the leading physicists of her generation, Dr. Chanda Prescod-Weinstein is also one of fewer than one hundred Black American women to earn a PhD from a department of physics. Her vision of the cosmos is vibrant, buoyantly nontraditional, and grounded in Black and queer feminist lineages. Dr. Prescod-Weinstein urges us to recognize how science, like most fields, is rife with racism, misogyny, and other forms of oppression. She lays out a bold new approach to science and society, beginning with the belief that we all have a fundamental right to know and love the night sky. The Disordered Cosmos dreams into existence a world that allows everyone to experience and understand the wonders of the universe.

Part 1. Aether is the Father of the Universe and the all-vivifying Spirit of Cosmic Matter. Myths always speak to those who listen. In Kosmos there are three higher principles: Chthonia (Chaos), Æther (Zeus) and Chronos (Time). Æther is the Spirit of Cosmic Matter, represented by Zeus, Osiris, and other androgynous deities; Astral Light is their shadow on earth. Fire is the unity of Æther in its universality. But there are two Kosmic “Fires,” and a distinction is made between them in the Occult teachings. Æther and Hemera are the light of the superior and the light of the inferior or terrestrial regions. Æther–Chaos–Akasha is Deity. The Æther of the Greeks is the Akasha of the Hindus; the Ether of modern physics is one of Æther’s subdivisions on our plane. Æther and Chaos (Plato’s Mind and Matter) are the two primeval and eternal principles of the universe, utterly independent of anything else. Æther is the all-vivifying intellectual principle; Chaos, a shapeless liquid principle, without “form or sense,” from the union of which two sprung into existence the Universe the first androgynous deity — the chaotic matter becoming its body, and æther its soul. Chaos–Theos–Kosmos are aspects of the Unknown Space. Deity, in the shape of Æther–Chaos–Akasha, Soul of the Universe and noumenon of Astral Light, pervades all things. The Theurgists called it the Living Fire, and the Spirit of Light. The science of physics, and of metaphysics for that matter, know nothing of Æther. Yet Father-Æther is re-welcomed with open arms; and wedded to gravitation. Æther is the source and cause of all forces, whether cohesive, chemical, thermal, electric, or magnetic. Æther is septenary, whether Akasha is meant by the term, or its lower principle — Ether. Akasha is the Matrix of the Universe and the “Mysterium Magnum,” from which all that exists is born by separation or differentiation: it is the cause of existence; it fills the infinite Space; and is Space itself, in one sense. But as the finite within the Infinite, this light must have its shadowy side — the “Astral Light,” which is no light. Individual human beings can overpower that “fatal light” but only by the holiness of their lives, and by acts of kindness and brotherly love. In Buddhism there are no compulsory beliefs. We are to believe only when the writing, doctrine, or teaching is corroborated by our own reason and consciousness. But then, we have to act accordingly and abundantly. Nihil is synonym for the impersonal divine Principle, the Infinite All, which is neither “being” nor “thing.” It is the Parabrahman of the Vedantist, The One Life of the Buddhist, “That” of the Chhandogya Upanishad, the Ain-Soph of the Kabbalah, The Absolute of Hegel. Lord Buddha taught that the Primitive Substance is eternal and unchangeable. Its vehicle is the pure, luminous Æther, boundless, infinite Space — still a creation of maya. Mastery of Buddhist dogmas can be attained only by following the Platonic deductive method, i.e., proceeding from universals to particulars. In Buddhist philosophy annihilation implies only a dispersion of matter in whatever form or semblance of form it may be. Even our astral bodies, pure ether, are but illusions of matter, so long as they retain their terrestrial outline. Æther is incorruptible. The spirits of creatures, who are emanations of the most sublimated portions of Æther, are Breaths not forms. The body of Jesus was abandoned to the earth while Christos, the Inner Man, was clothed with a luminous body made up of Æther. Part 2. Ether is the Mother of differentiated matter vivified by the formless Fire of Aether. When we recall pictures from the ether, the returning current meeting the outgoing wave of crystallised sound takes it up by magnetic attraction, and returns to us simultaneously the images of the past and the vibrations of its sounds. Each particle of matter is the register of all that has happened and previsionally apprehends even unspoken thought which, once conceived, displaces the particles of the brain by setting them in motion, and scatters its ideas throughout the universe, thus impressing them indelibly upon the eternal and boundless expanse of ether. The Divine Intellect is veiled in man. His animal brain alone philosophizes. When “astral light” circulates in harmony with the divine spirit, the occult powers of plants, animals, and minerals magically sympathize with the “superior natures,” and the divine soul of man attunes with the “inferior” ones. But during the barren periods, the latter lose their magic sympathy, and the spiritual sight of the majority of mankind is so blinded as to lose every notion of the innate powers of its divine lineage and essence. Spirit is the personal god of each mortal and his only divine element. The dual soul, on the contrary, is semidivine, i.e., potentially divine. It is only when the human individuality, soiled with earthly impurities, overcomes separateness and identifies itself with the divine intelligence within, that the aroma of personal experience can become immortal. Although invisible, thought is a material force. Let the least cerebral motion reverberate in the Ether of Space and it will produce a disturbance reaching to infinity. Akasha is not the Holy Ghost, because it would then be Shekh?nah (M?laprakriti). Akasha is the noumenon of the Cosmic Septenary, whose soul is Ether. Ether is the lining of Akasha, and Akasha is the Anima Mundi and Mother of Kosmos. Akasha, whose lowest form is the Ether of Space, is entirely different from the medium of Science. Fire is the Spirit of Deity, the active, male, generative principle; and Ether, the Soul of Matter, is the light of the Fire, the passive female principle from which everything in this Universe emanated. Hence, Ether or “Water” is Mother, and Fire is Father. Sound is the characteristic of Akasha (Ether): it generates air, the property of which is touch, and which, by friction, generates colour and light. The ether of Science is the grossest manifestation of Akasha, though on our plane, it is the seventh principle of the astral light, and three degrees higher than “radiant matter.” When ether penetrates or informs something, it may be molecular because it takes on the form of the latter, and its atoms inform the particles of that “something.” We may perhaps call matter “crystallised ether.” There is no such things as light, heat, sound, or electricity. There is nothing but radiant energy due to one thing — Motion of Ether. Modern Science may divide its hypothetically conceived ether in as many ways as it likes; the real Ether of Space, i.e., Æther, will remain as it is throughout. Ether is the vibrating sound-board in Nature, in all of her seven differentiations. Where there was no Ether there would be no sound. The “Astral Light,” or Ether of Space, preserves the images of all beings and things on its sensitised waves. An occult explanation of “Spirit” photographs is that they are objective copies from subjective photographs impressed upon the ether, and constantly thrown out by our thoughts, words, and deeds. There exists an infinite ocean of ether, in which all material substance floats, and through which are transmitted all forces in the physical universe. So long as “Spirit” photography, instead of being regarded a science, is presented to the public as a new revelation from the God of Israel and Jacob, the jury will go on deliberating much longer. The mediumistic rapping is a correlation of vital force, emitted from the person of the rapper, with the potential energy of the ether. Cyprianus, the reformed sorcerer of Antioch, confessed that he knew of the Chaldæan division of ether into parts. Part 3. The Seven Cosmic Elements, with their numberless sub-Elements, are modifications of One Element. There is but One Element in Nature, and at its rootless root is Deity. The so-called Seven Elements, of which five have already manifested and asserted their existence, are the fabric veiling Deity. Father-Æther has pre-eminence over, and is the synthesis of, all elements. Chaos-Theos-Kosmos is Unknown Space, producing the four primary Elements, which are known on the terrestrial plane as Seven Cosmic Elements. The attempt to derive God from the Anglo-Saxon word “good” is an abandoned idea. God is Jod, a phallic hook. He may be the creator of physical man, “out of nothing,” but not the spark of divine intelligence that “fell” in order to make animal man divine. The Seven “immortal gods who give birth and life to all” are constantly forming matter under the never-ceasing impulse of the One Element. The Seven Cosmic Elements, with their numberless sub-Elements, are modifications and aspects of the One and only Element. Four are entirely physical, and the fifth (Ether) semi-material. Akasha, of which Ether is the grossest form, is the Fifth Cosmic Principle which corresponds to, and from which unfolds, the human Manas. The first four numbers in German are named after four elements. But the Ancients represented the world by five elements. Had they been ignorant of the heterogeneity of the elements they would have had no personifications of Fire, Air, Water, Earth, and Æther. Of the Seven Elements on our Earth, four are now fully manifested, while the fifth — Ether — is only partially so, as we are hardly in the second half of the Fourth Round and, consequently, the Fifth Element will manifest fully only in the Fifth Round. It will only be in the next, or Fifth Round, that Ether, the gross body of Akasha, will become a familiar fact of Nature to all men, as air is familiar to us now. Cosmic Elements are the noumena of the terrestrial elements. “Water” is Matter in its precosmic state. Ether contains all other states of matter and their properties. The “waters” of creation are not the liquid we know, but Æther — the Fiery Waters of Invisible Space. Fohat is the “Son of Æther,” in its highest aspect. From Mahat-Intelligence proceeds ether; from ether, air; from air, heat; from heat, water; and from water, earth with everything on her. Æther is universal Fire — imponderable power and potency. Ether is one of Seven Cosmic Principles. Akasha is the synthesis of Æther; and Ether, an aspect of Akasha. The Astral Light is no “light,” it is the dark side of Ether, teeming with conscious, semi-conscious, and unconscious entities.

One of America's most talked-about science writers--and author of the award-winning book, Thursday's Universe--explores the phenomenon of "dark matter", the hypothesized, invisible substance that is changing our view of the universe. Photographs.