The Fifth Essence

More Than 2,000 Years Ago, Aristotle Proposed Adding A New Substance To The Four Elements Of Earth, Air, Fire, And Water--quintessence. Here, There Is Overwhelming Evidence That More Than 90 Percent Of The Universe Is Made Up Of A Mysterious Form Of Matter. Illustrated. Pt. I. The Stuff Of Matter. Making Something Out Of Nothing -- Filling The Void -- Pt. Ii. Weighing The Universe ... And Coming Up Short. First Light On The Darkness -- Beyond Our Island In The Night -- Pt. Iii. Why The Universe Is Flat: The Big Bang, Large-scale Structure, And The Need For Something New. Cooking With Gas -- The Tip Of The Iceberg -- Pt. Iv. The Neutrino Saga And The Birth Of Cold Dark Matter. The Obvious Choice? -- Cold Gets Hot -- Pt. V. The Candidates. All Roads Lead To Dark Matter -- Three Modest Proposals -- Pt. Vi. Desperately Seeking Dark Matter. The Music Of The Spheres? -- Of Thermometers And Radios -- Epilogue: The Best Of Times? -- Appendix A. Orders Of Magnitude And The Scale Of The Universe -- Appendix B.a Really Brief History Of Time. Lawrence M. Krauss. Includes Bibliographical References (p. [331]-332).