Concepts in astronomy

area of study in astrophysics

model of big-bang cosmology involving a FLRW spacetime with positive cosmological constant and cold dark matter

succession of methods by which astronomers determine the distances to celestial objects

model in cosmology

In physical cosmology, baryogenesis (also known as baryosynthesis) is the physical process that is hypothesized to have taken place during the early universe to produce baryonic asymmetry, the observation that only matter (baryons) and not antimatter (antibaryons) is detected in the universe (other than in cosmic ray collisions). Since it is assumed in cosmology that the particles we see were created using the same physics we measure today, and in particle physics experiments today matter and antimatter are always symmetric, the dominance of matter over antimatter is unexplained.

boundary between a magnetosphere and an ambient magnetized medium, for example when the solar wind encounters the magnetic field of Earth

apparent shift of position of a nearby star against the background of distant objects during Earth's orbital period

type of spectrum apart from the Big Bang, whichever shows the universe