opti - orig
- optical bursts
- optical components
- optical counterparts
- optical depth
- optical design
- optical double stars
- optical equipment
- optical fibers
- optical films
- optical filters
- optical flares
- optical glass
- optical identifications
- optical instruments
- optical interferometers
- optical interferometry
- optical materials
- optical observations
- optical observatories
- optical outbursts
- optical pathlength
- optical positions
- optical properties
- optical pulsars
- optical radar
- optical scanners
- optical spectrometers
- optical spectroscopy
- optical systems
- optical telescopes
- optical testing
- optical thickness
- optical transfer function
- optical waveguides
- optical windows
- optics
- orbit determination
- orbital elements
