• n
• nacreous clouds
• nadir
• nadir measures
• Nagler eyepiece
• naked eye
• naked-eye
• naked eye brightness
• naked-eye object
• naked-eye star
• Nancay radio observatory
• nanometer
• Narrabri interferometer
• narrow-band
• narrow-band burst
• narrow band filter
• narrow-band filter
• narrow-band photoelectric photometry
• narrow band photometry
• narrow-band photometry
• narrow-band polarimeter
• narrow filter
• narrow-range
• narrow-range equipment
• NASA
• NASA extragalactic data set
• NASA infrared telescope
• NASA,
• Nasmyth
• Nasmyth focus
• Nasmyth's focus
• Nasmyth system
• National Aeronautic and Space Administration
• National Astronomical Observatory
• National Center for Radio Astrophysics
• National Optical Astronomy Observatories
• National Solar Observatory
• National Space Science Data Center
• natural breadth
• natural frequency
• natural life time
• natural light
• natural line broadening
• natural satellite
• natural vibrations
• natural width
• natural year
• nature
• nautical almanac
• Nautical almanac
• nautical almanack
• nautical astronomy
• nautical tables
• nautical twilight
• navigation
• navigational
• navigational stars
• navigation satellite
• navigation triangle
• n-body problem
• nearby galaxies
• nearby stars
• near field response
• near infrared
• near infrared region
• nearly symmetric top
• near point of clear vision
• near ultraviolet
• nebula
• nebulae
• nebula filter
• nebula receding nebulae
• nebular line
• nebular remnant of a supernova
• nebular spectrograph
• nebular stage of nova
• nebular-type transitions
• nebular variables
• nebulosity
• nebulous object
• negative
• negative absorption
• negative acceleration
• negative branch
• negative cosmological constant
• negative development
• negative drift
• negative energy
• negative excess
• negative eyepiece
• negative image
• negative lens
• negative level
• negative rotational level
• neighbourhood
• neighbouring galaxies
• neon
• NEP
• nephelometer
• nephoscope
• nerve
• nested telescopes
• NESTOR neutrino detector
• net flux
• neutral absorption
• neutral atom
• neutral filter
• neutral gas
• neutral hydrogen
• neutral hydrogen cloud
• neutral hydrogen concentration
• neutral hydrogen content
• neutral hydrogen density
• neutral hydrogen distribution
• neutral hydrogen F
• neutral hydrogen gas
• neutral hydrogen mass
• neutral hydrogen motion
• neutral hydrogen region
• neutral medium
• neutral point
• neutral wedge
• neutrino
• neutrino astrophysics
• neutrino detector
• neutron
• neutron diffusion
• neutron number
• neutron star
• new galactic coordinates
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• new galactic coordinate system
• New General Catalog
• new moon
• new Moon in the old Moon's arms
• New technology telescope
• Newton focus
• Newtonian
• Newtonian-Cassegrain telescope
• Newtonian cosmology
• Newtonian flat
• Newtonian focus
• Newtonian focus position
• Newtonian gravitation
• Newtonian mirror
• Newtonian system
• Newtonian telescope
• Newtonian theory
• Newton's law of gravitation
• Newton's rings
• Newton's theory of gravitation
• Newton system
• NexStar telescopes
• Next generation space telescope
• N-h profile
• Nicol
• Nicol prism
• Nicol's prism
• night
• night airglow
• night correction
• night error
• nightglow
• night glow
• nightglow emission
• night hemisphere
• night of observation
• night side
• night sky
• night-sky brightness
• night sky light
• night sky luminance
• night-sky spectrum
• nighttime shower
• night-time stream
• night vision
• nimbus
• nitrogen
• NMR-spectrometer
• Nobeyama observatory
• noclilucent clouds
• nocturnal
• nocturne
• nodal point
• nodal regression
• nodal surface
• node
• nodical
• nodical month
• nodical revolution
• noise
• noise band
• noise bandwidth
• noise behind the signal
• noise-compensated radiometer
• noise compensation
• noise continuous noise
• noise current
• noise density
• noise distribution
• noise equivalent power
• noise equivalent resistance
• noise error
• noise factor
• noise figure
• noise fluctuations
• noise-free receiver
• noise generator
• noise interference sensitivity
• noise level
• noise power
• noise radiation from antenna
• noise radiation from atmosphere
• noise radiation from radiometer
• noise reduction
• noise signal
• noise source
• noise storm
• noise storm and bursts
• noise temperature
• noise voltage
• noisiness of receiver
• nomenclature
• nonacid fixing bath
• nonadiabatic
• nonbonding electron
• nonbonding orbital
• noncentral collision
• noncoherent scattering
• noncolor sensitized
• nonconservative case
• noncrossing rule
• nondegenerated species
• nondegenerated vibration
• nondirectional antenna
• nonempty model
• nonequilibrium theory
• nonequivalent electron
• nongravitational effects
• nongrey atmosphere
• nonhalation
• nonhomogeneous universe
• nonionized
• nonionized gas
• nonionized hydrogen region
• non-linear response
• nonluminous gas
• non-metals
• nonpenetrating orbit
• nonperiodic variable stars
• nonplanar molecule
• nonradial oscillation
• nonrecurrent disturbance
• nonrigid rotator
• nonrigid symmetric top
• nonselective absorber
• nonselective absorption
• nonselective diffuser
• nonselective radiator
• nonspherical
• nonspherical mirror
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• nonspherical plate
• nonspherical surface
• nonstable stars
• nonstationary current
• nonthermal background
• nonthermal component
• nonthermal emission
• nonthermal emitter
• nonthermal mechanism
• nonthermal process
• nonthermal radiation
• nonthermal radiator
• nonthermal radio emission
• nonthermal source
• nonthermal spectrum
• nonvignetted
• nonvignetted field
• noon
• normal acceleration
• normal coordinates
• normal distribution
• normal doublet
• normal extragalactic nebula
• normal eye
• normal frequency
• normal galaxy
• normalization
• normalized detectivity
• normal magnitude
• normal mode vibration
• normal multiplet
• normal optical thickness
• normal radio nebula
• normal ray
• normal slit width
• normal spiral
• normal star
• normal state
• normal substance
• normal term
• normal vibration
• normal Zeeman effect
• north
• north bearing
• north celestial pole
• north declination
• north ecliptic pole
• northern bearing
• northern hemisphere
• northern latitude
• northern lights
• northern polarity
• northern sky
• northern stars
• north galactic pole
• north hemisphere
• north pier
• north point
• north polar cap
• north polar distance
• North Polar Sequence
• north polar spur
• north pole
• north-south antenna
• north-south arm
• north-south direction
• north-south line
• north stars
• notch filter
• nova
• novae
• nova explosion
• nova-like star
• nova-like variable
• nova outburst
• nova spectrum
• npa
• N-radiation
• N-S arm
• N star
• N-type star
• nuclear astrophysics
• nuclear deformation
• nuclear disintegration
• nuclear emulsion
• nuclear-emulsion film
• nuclear energy
• nuclear fission
• nuclear fusion
• nuclear gas
• nuclear induction
• nuclear magnetic resonance
• nuclear magneton
• nuclear moment
• nuclear plate
• nuclear quadrupole resonance
• nuclear reaction
• nuclear region
• nuclear separation
• nuclear spin
• nuclear star
• nuclear transformations
• nucleogenesis
• nucleon
• nucleosynthesis
• nucleus
• nucleus bands
• nuclide
• Nuffield Radio Astronomy Laboratory
• null geodesic
• null line
• null line gap
• null method
• null test
• number
• number/flux density count
• number/flux density distribution
• number/flux density relation
• number/flux density statistics
• number-magnitude distribution
• number of detectable sources
• numerical solution
• nutation
• nutational ellipse
• nutation in longitude
• nutation in obliquity
• Nyquist frequency
• Nyquist noise
• N-
• N-
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