astronomy
the discipline that studies celestial objects and the universe beyond earth. astronomy bridges cosmo (large-scale structure and origin) and quantum (the physics of stars, radiation, and compact objects)
in the crystal, astronomy spans two domains:
cosmo — Big Bang, galaxy, nebula, cosmic expansion, dark matter, dark energy
quantum — stellar physics, radiation, nuclear fusion, electromagnetism
branches
observational astronomy → cosmo + sense (telescopes, spectroscopy, imaging)
astrophysics → cosmo + quantum (stellar structure, nucleosynthesis, compact objects)
cosmology → cosmo + quantum + energo (origin, expansion, fate of the universe)
planetary science → cosmo + geo (formation, atmospheres, surfaces)
radio astronomy → cosmo + info (radio, signals, pulsars)