Author: u7col8p7gb

How Astronomers Measure Distances to Stars

How astronomers measure distance to stars: parallax for nearby stars, then standard candles such as Cepheids, linked as the cosmic distance ladder.

Tidal Locking Explained: Worlds That Face One Side to Their Star

Tidal locking explained: why the Moon always shows one face, how a planet ends up with a permanent dayside and nightside, and which worlds are not locked.

Exoplanet Atmospheres: How Light Reveals What Is in the Air

Exoplanet atmospheres are studied by splitting starlight into spectra. See how transmission, emission and cross-correlation methods find molecules.

What Is an Exoplanet? Definition and How They Are Found

An exoplanet is a planet orbiting a star other than the Sun. Learn how astronomers find them with transits, wobbles, imaging and lensing.