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Loading contentEverything astronomy knows, it knows through a method. This encyclopedia explains how — how we measure a distance, weigh a black hole, read a spectrum, and detect a ripple in spacetime — and how uncertainty is measured, not hidden.
The families of technique — astrometry, photometry, spectroscopy, the distance ladder, exoplanet detection, time-domain, gravitation, and measurement.
8 entriesHow astronomers measure distances across the universe — parallax, proper motion, standard candles, Cepheids, and redshift.
8 entriesReading light — photometry and the magnitude system, imaging and interferometry, and the spectroscopy that reveals composition and motion.
7 entriesThe techniques that find and weigh planets around other stars — transit, radial velocity, microlensing, and more.
7 entriesAstronomy in other channels — gravitational lensing and waves, neutrinos, multi-messenger events, and the seismology of stars.
7 entriesMeasuring the precise positions and motions of the stars — parallax, proper motion, and the space astrometry that has mapped over a billion stars. The foundation on which distances across the galaxy are built.
Measuring how bright things are and resolving their fine detail — the magnitude system, precision photometry, and the interferometry and adaptive optics that sharpen the view.
Splitting light into its spectrum to read the composition, temperature, motion, and magnetic fields of distant objects — and classifying stars by what their spectra reveal.
How astronomers measure distances across the universe — a ladder from parallax to standard candles to redshift, each rung calibrating the next, reaching from nearby stars to the edge of the observable universe.
The techniques that find and weigh planets around other stars — from the tiny dimming of a transit to the wobble of radial velocity — most of them modelled already in the exoplanet encyclopedia.
Watching how things change with time — the oscillations that let us sound the interiors of the Sun and stars, the occultations that reveal sizes, and the study of the variable and transient sky.
Astronomy beyond light — the bending of light by gravity, the direct detection of gravitational waves and cosmic neutrinos, and the combined multi-messenger view of the most violent events.
How raw measurements become knowledge — deriving the properties of stars and galaxies, weighing black holes, mapping dark matter through rotation curves, and the calibration, error analysis, and honest uncertainty that make a measurement science.
Each method category and technique is a first-class knowledge-graph entity resolved through the Scientific Data Engine, reusing the exoplanet-detection methods, cosmology concepts, observing bands, the Gaia telescope, and the Harvard classification already in the graph. Curated from NASA and ESA. Every method carries its uncertainties — a measurement without an error bar is not a measurement. See source quality.