The Known Universe
Physics notes
Cosmology
Cosmology questions (Introduction) solutions Cosmology questions (Advanced) solutions
Derivation of Kepler’s Laws
Movies Inner solar system Outer solar system binary stars equal mass binary stars equal mass 2D with density Unequal binary stars 90deg to rings Unequal binary stars 90deg to rings + velocity map
Interacting galaxies simulation
Gravity & Orbits
Solar System spreadsheet Gravity simulator spreadsheet Gravity simulator (MATLAB) notes
Simulations
Kepler’s Laws & Universal Gravitation
Cavendish Experiment Measuring G Hubble’s Law & The Friedmann Equations Measuring cosmological distances Relativistic effects of gravity Stars & Spectroscopy Structure & evolution of stars
Lagrange points
How big? How old? Stars & galaxies The Solar System Gravity Exotic objects
cosmic calculator
2021 exoplanet analysis 2019 Excel Kepler III 2018 MATLAB Kepler III
Scale visualisation of the planets
Cosmic ladder part 1 Cosmic ladder part 2 Stars and planets to scale Solar system scale model Scale model of time
First created July 2012
Last updated May 2025