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- Universe and Cosmology Flashcards
Universe and Cosmology Flashcards
Physics 127 with Moody at Brigham Young University
About this deck
By: Susannah Crump
Created: 2011-12-10
Size: 34 flashcards
Views: 8
Created: 2011-12-10
Size: 34 flashcards
Views: 8
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dark matter
Matter that reveals itself only through its gravitational attraction.
dark energy
The source of the force that is accelerating the expansion rate of the universe.
supermassive black hole
An entity that is likely in the nucleus of most, if not all, galaxies.
blazar
A highly variable galaxy nucleus of which BL Lac is one. Their light is highly energetic and their spectra are featureless.
accretion disk.
A toroidal or donut-shaped collection of material attracted to a central body like a star or black hole.
hubble constant
The rate of expansion of the universe.
synchrotron radiation
radiation emitted when charged particles spiral rapidly in a madnetic field.
quasar
A very distant, star-like object with huge, broad emission lines. Probably the nucleus of a distant active galaxy.
Hubble law
The linear correlation between the rate of the expansion of the universe and distance.
standard candle
any class of objects with a uniform luminosity used to determine distance.
Seyfert galaxy
A nearby galaxy with a quasar-like nucleus.
AGN
The class of all objects having high energy radiation coming from their nuclei.
radio galaxy
A galaxy emitting large amounts of energy at long wavelengths.
radio lobe
Clouds of low density gas often found glowing faintly on either side of an AGN.
cosmological principle
The assumption that the universe is isotropic and homogeneous.
Big Bang
The name fro the only seriously considered theory of the universe.
Planck time
The instant of time after the Big Bang when space and time obtained their characteristics.
Big Crunch
The fate of the universe if it is closed.
isotropic
A word meaning "The same in all directions"
radiation dominated universe
The opaque universe that existed for 3000,000 years after the Big Bang.
homogeneous
A word meaning, "The same everywhere throughout"
critical density
The average amount of matter per cubic meter needed to close the universe.
matter dominated universe
The era when the ratio of matter to energy greatly favored matter.
cosmology
The study of the universe as a whole.
Olber's paradox
The puzzle of why the sky gets dark at night.
cosmic singularity
The entity from which the whole universe is postulated to have come from.
quarks
The elementary building blocks from which protons and neutrons are formed.
era of recombination
The time when the universe cooled sufficiently for atoms to exist.
particle horizon
The "edge" of the universe. Light beyond this has not reached us yet.
CMB
The faint glow of light left over from the Big Bang.
cosmological red shift
The displacement of spectral lines to redder colors caused by the expansion of the universe.
cosmic fireball
The mix of pure photon energy that emerged at the start of the universe.
density parameter
The ratio of the actual density of the universe tot he critical density.
SETI
The organized effort to find life elsewhere in the universe.
About this deck
By: Susannah Crump
Created: 2011-12-10
Size: 34 flashcards
Views: 8
Created: 2011-12-10
Size: 34 flashcards
Views: 8
About StudyBlue
STUDYBLUE makes things that make you better at school.
Things like online flashcards with photos and audio.
Things like personalized quizzes and friendly reminders about when (and what) to study next.
Think of it as a digital backpack™: access to all of your study materials online and on your phone.
STUDYBLUE exists to make studying efficient and effective for every student, for free. Join us.
“I have been getting MUCH better grades on all my tests for school. Flash cards, notes, and quizzes are great on here. Thanks!”
Kathy
Kathy