Fields
Astronomy
The solar system, stars, galaxies, and expansion — reading the sky with measurements and physical law.
Topics
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Solar system
Planets, Kepler, gravity, escape speed.
Stars
HR diagram, fusion, lifetimes, magnitude.
Galaxies and cosmology
Galaxies, Hubble, redshift, black holes.
Observing basics
Celestial sphere, coordinates, telescopes, spectra.
Exoplanets and life
Detection, habitable zone, a SETI sketch.
The Sun and space weather
Solar structure, spots, flares and CMEs.
Moon, tides, and eclipses
Lunar phases, tides, and solar and lunar eclipses.
Magnitudes and spectra
Apparent and absolute magnitude, distance modulus, colour and spectral type, Wien’s law.
Galaxies and Hubble
Galaxy shapes, rotation curves, the Hubble–Lemaître law, and a standard-candle sketch.