Month: July 2025

ANGULAR DIAMETER DISTANCE
A method using an object’s apparent size to estimate distance.

GAIA SPACE OBSERVATORY
A European satellite measuring precise stellar parallaxes.

SPECTROSCOPIC PARALLAX
Estimating a star’s distance based on its spectral classification.

COSMIC DISTANCE LADDER
A series of techniques used to measure increasing cosmic distances.

TELESCOPE RESOLUTION
The ability of a telescope to detect small parallax shifts.

SUPERNOVAE AS DISTANCE MARKERS
Type Ia supernovae used to measure vast distances.

CEPHEID VARIABLES
Pulsating stars whose brightness variations help measure cosmic distances.

STANDARD CANDLE
An astronomical object with known luminosity used for distance measurement.

HERTZSPRUNG-RUSSELL DIAGRAM
A chart linking a star’s brightness to its spectral type, aiding distance estimation.

BASELINE
The distance between two points used in parallax measurements.