spherical region
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Spherical Earth — Medieval artistic representation of a spherical Earth with compartments representing earth, air, and water (c. 1400). The concept of a spherical Earth dates back to ancient Greek philosophy from around the 6th century BC … Wikipedia
spherical degree — a unit of relative surface area for spheres, equal to 1/720 the total surface area or pi·R2/180, where R is the radius of the sphere. Thinking in terms of the Earth s surface, this is the area of the region in one hemisphere (northern or… … Dictionary of units of measurement
H II region — An H II region (also known as emission nebula) is a cloud of glowing gas and plasma, sometimes several hundred light years across, in which star formation is taking place. Young, hot, blue stars which have formed from the gas emit copious amounts … Wikipedia
radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… … Universalium
orbital — /awr bi tl/, adj. 1. of or pertaining to an orbit. n. 2. Physics, Chem. a. a wave function describing the state of a single electron in an atom (atomic orbital) or in a molecule (molecular orbital). b. the electron in that state. [1535 45; < NL,… … Universalium
Dark matter halo — Simulated dark matter halo from a cosmological N body simulation A dark matter halo is a hypothetical component of a galaxy, which extends beyond the edge of the visible galaxy and dominates the total mass. Since they consist of dark matter,… … Wikipedia
Hubble volume — [ large scale structure of the universe in the Hubble volume. The scale is such that the fine grains of light represent collections of large numbers of superclusters. The Virgo Supercluster home of our own galaxy is at the center of our Hubble… … Wikipedia
Brodie abscess — a roughly spherical region of bone destruction, filled with pus or connective tissue, usually found in the metaphyseal region of long bones and caused by Staphylococcus aureus … Medical dictionary
Sphere of influence (astrodynamics) — A sphere of influence (SOI) in astrodynamics and astronomy is the spherical region around a celestial body where the primary gravitational influence on an orbiting object is that body. This is usually used to describe the areas in our solar… … Wikipedia
Photon sphere — A photon sphere is a spherical region of space where gravity is strong enough that photons of light are forced to travel in orbits. The formula to find the radius for a circular photon orbit is: r=3GM/C2. Because of this equation photon spheres… … Wikipedia
Island in the Sea of Time — Infobox Book name = Island in the Sea of Time title orig = translator = image caption = author = S. M. Stirling illustrator = cover artist = country = United States language = English series = Nantucket series genre = Science fiction novel… … Wikipedia
