Greenhouse Effect — An increase in temperature caused when incoming solar radiation is passed but outgoing thermal radiation is blocked by the atmosphere. Local supercluster — the galaxy supercluster to which the Local Group belongs; it spreads over 100 million light-years and boasts the Virgo Cluster as its dominant member. Antimatter is matter composed of anti-particles: antiprotons, antineutrons, and positrons. Diameter of the objective of a telescope. Radiation zone of charged particles surrounding Earth.
Radiant — Location in the sky where meteors belonging to a meteor shower appear to come from. Because of the thickness, they are totally opaque to visible light; however, they can be studied using infrared and radio techniques. Lunar eclipse — a phenomenon caused by the Earth passing between the sun and moon. Emission — Discharge of electromagnetic radiation from an object. It is a class of galaxies that emit a large amount of energy from their center more than ordinary galaxies. It is used to remove atmospheric distortion through the use of astronomical telescopes and laser communication.
Lighter region of a sunspot surrounding the umbra dark center. Synodic Period — Interval between points of opposition in a superior planet. Revolution — Orbital motion of a body around a common center of mass or another body. Millisecond pulsar — Neutron star rotates hundreds of times per second, which typically accretes matter from a stellar companion. Patera — A shallow crater with a scalloped and complex edge; saucer shaped volcanic structure. Meteor showers — Period of meteor activity that occurs when Earth collides with many meteoroids; an individual shower happens at the same time each year and has all its meteors appearing to radiate from a common point.
A single stage to orbit spacecraft. Nebula — a cloud of interstellar gas and dust; some nebulae represent stellar nurseries, others represent stellar graveyards. Comet is a celestial body moving about the sun consisting of a central mass surrounded by an envelope of dust and gas that may form a tail that streams away from the sun. Halo — Outer region of a galaxy, contains globular clusters, a few stray stars, and dark matter. Any star of average to low brightness, mass, and size. Meteoroid — Small rock that orbits the sun. Mare — Dark and smooth area on the surface of the moon or on a planet.
The ratio of the density of the universe to the critical density 2. Scarp — Cliffs created by erosion and fault movement. It is the theoretical temperature entropy reaches its minimum value. Ejecta usually appear lighter in color than the surrounding surface. A gaseous envelope that surrounds the sun outside the photosphere from which large quantities of hydrogen and other gases erupt from. Hertz — A unit of frequency equal to one cycle per second. © 2018 All Rights Reserved.
Carbon dioxide and water vapor are two of the major gases responsible for this effect. Ellipse — An oval shape. This is used to locate the position and size of a celestial object. Umbra — Perfect and whole shadow of an opaque body, like a planet, wherein direct light from the source of brightness is totally reduced. Plasma — Gas heated to a state wherein it contains ions and free floating electrons. This is caused by small particles of reflected sunlight. It is the ratio of total-reflected light.
Synchrotron emission — Electromagnetic field from high-energy electrons that are moving in a given magnetic field. Trans-Neptunion Object — Object in our solar system lying beyond the orbit of Neptune. Hypered film — Film that has been treated, usually with gas, to enhance its response to low light levels. Space-time — When the three dimensions of space come together with one dimension of time wherein the events can be exactly calculated. Extragalactic — Beyond the Milky Way galaxy. Rich clusters — Galaxy clusters with high population densities.
Galaxy — an enormous gravitationally bound assemblage of millions or billions of stars. Superior planet — Planets that are farther from the sun than earth: Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Eastern portion is visibly bright during this phase. An object approaching the observer will have a shorter wavelength blue while an object moving away will have a longer red wavelength. Molecule — Combination of two or more atoms that represent the smallest part of a compound that has the chemical properties of that compound.
The gravitational field is intense that no electromagnetic radiation can escape. Primary lens — Main lens of a telescope that gathers light bringing the object into focus. Used by astronomers to observe view specific wavelengths and to minimize the light of exceptionally bright objects. The radiation has a wavelength and frequency. Contains a high density of stars and gas and a super massive black hole. Such encounters can increase normal meteor rates by more than 1,000 meteors per minute.