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22 Cards in this Set
- Front
- Back
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Spacetime
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Three physical dimensions of space combined with time. Used as a fundamental framework of the theory of relativity
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Field Equations
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Einstein created, The calculaton of bending light
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Geodesic
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The notion of a straight line to curved space
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Schwarzchild Solution
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Mathematical solutions to the equations which correspond to the gravitational field of a massive compact object
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Singularity
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A region in spacetime where the known laws of physics break down and the curvature of space becomes infinite
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Gravitational Lensing
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The bending of light by gravity or by foreground galaxies
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Gravitational Redshift
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Light is emitted at a lower frequency and longer or redder wavelengths in a gravitational field than in the absense of a gravitational field
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LIGO
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Laser Interferometer Gravitational-Wave Observatory. The U.S effort to detect and locate sources of gravitational waves arriving distant cosmos
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Richness
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Meant to describe a cluster in terms of the number of galaxies it contains with a certain brightness internal
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Cd Galaxy
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A large, diffuse galaxy, often the brightest in a cluster of galaxies
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Galactic Cannibalism
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Galaxies that eat other galaxies. Mass is greater than mass of normal galaxies
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Supercluster
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A tendency of some clusters to be clustered together in even grander clusters
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Hubble Constant
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The constant of proportionality between the distances and the radial recession velocities of galaxies
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Cosmic Microwave Background Radiation (CMBR)
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The radiation left over from the epoch when the cooling universe changed from an ionized plasma to a natural atomic state
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COBE
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Stands for cosmic background explorer. Groups of scientists who study galaxies.
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AGN
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Active Galactic Nuclei. Found in galaxies that exhibit unusually energetic behavior in their centers
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IRAS
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Infrared Astronomy Satellite. A satellite aimed at mapping the entire infrared sky
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Carl Jansky
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Helped develop radio astronomy in the 1930's with a crude antenna made of wood and pipe
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Cas A
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Stands for cassiopeia A. The brightest radio object in the sky
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Jets
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Objects of great radiation that are usually emitted in two opposing directions. They can be detected at optical, radio, and x-ray wavelengths
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Sychrotron Radiation
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Light emitted by charged particles moving at velocities close to that of light in the presence of a magnetic field
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Accretion Disk
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The immediate environmnent of a black hole
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