Cosmology and Investigation flashcards

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What is meant by “Dark matter” in this lesson?Dark Matter and Large-Scale Structure: Dark matter is a component inferred from gravity that does not emit ordinary detectable light like stars.
What is meant by “Rotation curve” in this lesson?Dark Matter and Large-Scale Structure: A rotation curve reports orbital speed as a function of radius under defined measurements.
What is meant by “Gravitational lensing” in this lesson?Dark Matter and Large-Scale Structure: Lensing bends or distorts received light through gravitational effects.
What is meant by “Galaxy cluster” in this lesson?Dark Matter and Large-Scale Structure: A cluster is a gravitationally associated collection of galaxies and other matter.
What is meant by “Cosmic web” in this lesson?Dark Matter and Large-Scale Structure: The cosmic web describes large-scale patterns of filaments, clusters, and voids.
What is meant by “Inference limit” in this lesson?Dark Matter and Large-Scale Structure: A limit separates evidence for missing gravitational mass from a confirmed particle identity.
What is meant by “Cosmic expansion” in this lesson?Expansion and Cosmic History: Cosmic expansion increases large-scale separations between unbound systems in the cosmological model.
What is meant by “Cosmological redshift” in this lesson?Expansion and Cosmic History: Cosmological redshift stretches radiation wavelengths as the universe expands.
What is meant by “Hubble-Lemaitre relation” in this lesson?Expansion and Cosmic History: At sufficiently small cosmological redshifts, recession-related speed approximately increases with distance.
What is meant by “Hot Big Bang” in this lesson?Expansion and Cosmic History: The hot Big Bang model describes an earlier hot dense state and subsequent expansion.
What is meant by “Cosmic microwave background” in this lesson?Expansion and Cosmic History: The CMB is relic radiation released when the early universe became transparent.
What is meant by “Dark energy” in this lesson?Expansion and Cosmic History: Dark energy names the component or explanation associated with accelerated expansion in standard cosmology, with its nature unresolved.
What is meant by “Observing question” in this lesson?Planning an Observing Investigation: A question specifies an observable phenomenon and comparison.
What is meant by “Observing log” in this lesson?Planning an Observing Investigation: A log records dates, conditions, equipment, and measurements.
What is meant by “Sampling cadence” in this lesson?Planning an Observing Investigation: Cadence is the timing of repeated observations and affects detectable variation.
What is meant by “Safe observation” in this lesson?Planning an Observing Investigation: Safe observation uses approved methods and equipment, especially for solar viewing.
What is meant by “Evidence synthesis” in this lesson?Planning an Observing Investigation: Synthesis connects measurements with competing models and assumptions.
What is meant by “Qualified conclusion” in this lesson?Planning an Observing Investigation: A conclusion states scope and uncertainty rather than claiming unsupported certainty.