Space & astronomy
- Aphelion vs perihelion
- Artificial satellite vs space probe
- Asteroid vs comet
- Asteroid vs meteoroid
- Astronomical vs meteorological seasons
- Astronomy vs astrology
- Comet nucleus vs comet coma vs comet tail
- Galaxy vs solar system
- Geostationary orbit vs geosynchronous orbit
- Light-year vs astronomical unit
- Meteor vs meteoroid vs meteorite
- Nebula vs galaxy
- Neutron star vs black hole
- Nova vs supernova
- Orbital flight vs suborbital flight
- Planet vs dwarf planet
- Rotation vs revolution
- Sidereal month vs synodic month
- Sidereal year vs tropical year
- Solar day vs sidereal day
- Solar eclipse vs lunar eclipse
- Solar eclipse vs transit
- Solstice vs equinox
- Star vs planet
- Waxing moon vs waning moon