Unfurling the codex…
A source-cited reference to astronomy
Cosmic inflation · Cosmic ray · Cosmological constant · Crab Nebula · Dark nebula · Dwarf galaxy · Eris (dwarf planet) · Event horizon · Exoplanet · Extinction (astronomy) · Extraterrestrial life · Galaxy formation and evolution · Galaxy groups and clusters · Galaxy morphological classification · Giant planet · Giant star · H II region · Halley's Comet · Hertzsprung–Russell diagram · Hubble's law · Hyades (star cluster) · Elliptical galaxy