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259 "U"

U-B
U-B color index
U burst
U, B, V
UBV
U, B, V magnitude
UBV photometric system
UBV-photometry
UBV-
U Geminorum stars
UK infrared telescope
UK Schmidt telescope
ultimate lines
raies ultimes
vacuum ultraviolet
ultraviolet absorption
ultraviolet astronomy
ultraviolet data
ultraviolet emission
ultraviolet excess
ultraviolet image
ultraviolet light
ultraviolet plate
ultraviolet radiation
ultraviolet range
ultraviolet rays
extreme ultraviolet region
ultraviolet spectrum
ultra-wide angle eyepiece
U-magnitude
sunspot umbra
U-measure
unaided eye
unbound electron
uncertainty
uncertainty of measurement
uncertainty of observation
uncertainty principle
spin uncoupling
under bad seeing
under conditions of weightlessness
underdeveloped
underexposed
region of under-exposure
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
technique of unfilled apertures
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
International Astronomical Union
unionized
unionized hydrogen
unipolar
unipolar group
unipolar magnetic region
unipolar spot
unipolar sunspot
solar neutrino unit
unit angle
unit brightness
column of unit cross sectional area
united atom
United States Naval observatory
unit for Zeeman effect
electron density per unit length
unit power finder
unit weight
law of universal gravitation
universal instrument
universal time
visible universe
universe as a whole
universe in the large
Association of Universities for Research in Astronomy
Mount John University observatory
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
to set up
uplands
upper atmosphere
upper chromosphere
upper conjunction
upper culmination
upper end of tube
upper level
upper polar(-axis) bearing