Flashcards - The Universe: Key Concepts & Theories

Flashcards - The Universe: Key Concepts & Theories
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11 cards in set
The positron or antielectron is the antiparticle or the antimatter counterpart of the electron
cosmological constant
In cosmology, the cosmological constant is the value of the energy density of the vacuum of space
Dark Age
Dark Ages is a term of historical periodization traditionally meaning the Middle Ages
Big Bang
The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter
solar system
The Solar System is the gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly
The Universe is all of time and space and its contents
Hot dark matter
Hot dark matter is a theoretical form of dark matter which consists of particles that travel with ultrarelativistic velocities
recombination epoch
In cosmology, recombination refers to the epoch at which charged electrons and protons first became bound to form electrically neutral hydrogen atoms
inflationary universe
In physical cosmology, cosmic inflation, cosmological inflation, or just inflation is a theory of exponential expansion of space in the early universe
dark energy
In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe

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