RAVITY was the focus of twentieth-century astrophysics; for the twenty-first century, it will be electromagnetism and plasmas in addition. This emerging paradigm shift is presaged by the rapid pace of discoveries about our own starVthe SunVand its total plasma environment. These discoveries are particularly well marked by the discovery in 1958, at the beginning of the Space Age, of Earth's radiation belt, or Van Allen belts, by Dr. J. A. Van Allen (1914-2006 for whom this Special Issue on Space and Cosmic Plasma is dedicated. Van Allen's discovery and many other discoveries over the past four decades have profoundly changed our view of space environmentsVfrom Bempty[ space to the fullness of space plasmas at all scale lengths. Some examples of these discoveries are the following: 1) in-situ measurements of the properties of plasmas in the magnetospheres, leading to the confirmation of Birkeland field-aligned currents, double-layer acceleration of charged particles, magnetic flux ropes in the ionospheres of planets, and a system of currents in the magnetospheres of the outer planets; 2) discovery of an immense filamentary magnetic fieldaligned plasma structure at the center of our galaxy and the continuing discovery of related multiscale filamentary plasma structures in most astrophysical environments; 3) laboratory experiments duplicating the power laws of electromagnetic radiation from extragalactic sources and confirming that plasma processes are often responsible for the acceleration of charged particles to high energies; 4) the advent and application of multidimensional, relativistic, and fully electromagnetic particle-in-cell simulations to space and cosmic plasma. The goals of this Special Issue of the IEEE TRANSACTIONS ON PLASMA SCIENCE are to provide an update on progress in topical areas of the plasma universe and to report on the exchange of knowledge between plasmas of all dimensions in the size hierarchy from new observational, theoretical, experimental, and computational results.Eskimo Nebula, NGC 2392, Hubble Space Telescope Image (credit: NASA). Space plasma researchers and pulse power engineers have long speculated that the progenitor of intense auroras, protoplanetary and planetary nebula, and supernovae is the Z-pinch, as both display the temporal, morphological, and radiation properties that are found in high-energy-density plasmas produced in the laboratory and in extreme high-current explosive test experiments. On the right is an overlay of 56 radial lines representing 56 twisted pairs of current filaments, as recorded in pinches and the penumbra of the dense plasma focus [1]- [3]. The template lines are centered on the intensely radiating pinch at the center of the nebula. The Eskimo Nebula has a distance of 2.9 kly and a radius of approximately 3.4 ly. (A. L. Peratt, Los Alamos National Laboratory).