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131 "U"

• U-B color index
• U burst
• U, B, V magnitude
• UBV photometric system
• UBV-photometry
• UBV-
• U Geminorum stars
• UK infrared telescope
• UK Schmidt telescope
• ultimate lines
• ultraviolet
• ultraviolet absorption
• ultraviolet astronomy
• ultraviolet data
• ultraviolet emission
• ultraviolet excess
• ultraviolet image
• ultraviolet light
• ultraviolet plate
• ultraviolet radiation
• ultraviolet range
• ultraviolet rays
• ultraviolet region
• ultraviolet spectrum
• ultra-wide angle eyepiece
• U-magnitude
• umbra
• U-measure
• unaided eye
• unbound electron
• uncertainty
• uncertainty of measurement
• uncertainty of observation
• uncertainty principle
• uncoupling
• under bad seeing
• under conditions of weightlessness
• underdeveloped
• underexposed
• underexposure
• under good seeing
• under observation
• under-sampling
• undisturbed
• undisturbed photosphere
• undisturbed photospheric region
• undisturbed Sun
• undriven camera
• undulation
• uneven development
• uneven drying
• uneven emulsion
• uneven fixing
• un-filled aperture
• unfilled aperture
• unfilled aperture antenna
• unidentified band
• unidentified radio star
• unidentified source
• unified field theory
• uniform development
• uniform diffuser
• uniform model universe
• uniform motion
• uniform sidereal time
• unilluminated hemisphere
• unilluminated side
• unionized
• unionized hydrogen
• unipolar
• unipolar group
• unipolar magnetic region
• unipolar spot
• unipolar sunspot
• unit
• unit angle
• unit brightness
• united atom
• United States Naval observatory
• unit for Zeeman effect
• unit power finder
• unit weight
• universal gravitation
• universal instrument
• universal time
• universe
• universe as a whole
• universe in the large
• unmanned artificial satellite
• unperturbed orbit
• unpolarized
• unpolarized burst
• unpolarized component
• unpolarized continuum
• unpolarized light
• unpolarized radiation
• unresolved
• unresolved bands
• unresolved lines
• unresolved sources
• unsensitized emulsion
• unsharp masking
• unstable
• unstable equilibrium
• unstable state
• unsteady image
• unvignetted
• unvignetted field
• unwanted signal
• uplands
• upper atmosphere
• upper chromosphere
• upper conjunction
• upper culmination
• upper end of tube
• upper level
• upper polar-axis bearing
• upper polar bearing
• upper transit
• upright image
• uranium
• UT
• uvby photometric system
• uv plane
• UV-ray picture
• uv-
• UWA eyepiece
• UWA-
• U-
• U-
• U-


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Rambler's Top100