A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

N galaxy
N series (Japanese rockets)
N-1
N44 superbubble
NACA (National Advisory Committee for Aeronautics)
Nadezhda
nadir
Nagel point
NAI
Naiad
nail
naked singularity
naked-eye star
Nakhla meteorite
nakhlite
nanobacteria
nanobes
nanofossils
nanotechnology
Nansen, Fridtjof (1861–1930)
Naos (Zeta Puppis)
Napier, John (1550–1617)
nappe
naphtha
naphthalene
narcissistic number
narcolepsy
Narlikar, Jayant Vishnu (1938–)
narrowband
NASA
NASA Ames Research Center
NASA Astrobiology Institute
NASA Bioscience Advisory Committee
NASA-Brookings Study
NASA Institute for Advanced Concepts
NASA/Caltech Jet Propulsion Laboratory
NASA Johnson Space Center (JSC)
NASA Office of Life Sciences
nasal bone
nasal cavity
Nash, John Forbes Jr. (1928–2015)
Nash equilibrium
Nasmyth, James (1808–1890)
Nasmyth focus
National Advisory Committee for Aeronautics (NACA)
National Aeronautics and Space Administration (NASA)
National Optical Astronomy Observatories (NOAO)
National Physical laboratory (NPL)
National Radio Astronomy Observatory (NRAO)
National Reconnaissance Office (NRO)
National Rocket Club
National Solar Observatory
National Space Club
National Space Society
NATO (satellites)
natrolite
Natta, Giulio (1903–1979)
natural gas
natural number
natural selection
natural theology
Nauka
nausea
nautilus
Navaho
navigation
navigation satellite
Navsat (Naval Navigation Satellite)
NAVSTAR (Navigation Satellite Time and Ranging)
Neanderthal
near-Earth asteroid
Near-Earth Asteroid Rendezvous (NEAR)
Near-Earth Asteroid Tracking (NEAT)
near-Earth object (NEO)
nearest stars
NEAR-Shoemaker
nebula
nebula filter
NEBULAE AND STAR CLUSTERS
nebular hypothesis
neck
Necker cube
nectar
Needle Galaxy (NGC 4565)
Néel, Louis Eugène Félix (1904–2000)
negative base
negative mass
negative numbers
Neile's parabola
nekton
nematocyst
nematode
Nemertea (ribbon worms)
neodymium
neon
Neopilina
neoteny
neper (unit)
nephritis
nephroid
nephron
Neptune
neptunium
Nereid
Nereus
Nernst, Walther Hermann (1864–1941)
NERVA (Nuclear Engine for Rocket Vehicle Application)
nerve
nerve impulse
nerve root
nervous system
nervous system, vertebrate
nervous system disease
nest
net
Neumann, Franz Ernst (1798–1895)
Neumann line
neural network
neural plate
neural tube
neuralgia
neuritis
neurofibromatosis
neurology
neuron
neurotransmitter
Neusis construction
Neutral Buoyancy Simulator
neutral point
neutralino
neutralization
neutrino
neutrino communication
neutron
neutron activation analysis
neutron star
neutron star, life on
neutronium
neutrophil
névé
New World tropics
New Horizons Pluto-Kuiper Belt mission
New Style date
Newcomb, Simon (1835–1909)
Newcomb's paradox
Newcomen, Thomas (1663–1729)
Newell, Homer E. (1915–1983)
Newlands, John Alexander Reina (1837–1898)
newton (unit)
Newton, Isaac (1642–1727)
Newtonian mechanics
Newtonian telescope
Newtonian-Cassegrain telescope
Newton's color disk
Newton's law of gravity
Newton's laws of motion
Newton's orbital cannon
Newton's rings
Ney-Allen Nebula
NGC 1187
NGC 2261 (Hubble's Variable Nebula)
NGC 2346
NGC 2362 (Tau Canis Majoris cluster)
NGC 2516
NGC 253
NGC 2808
NGC 281
NGC 2867
NGC 3532
NGC 4565 (Needle Galaxy)
NGC 4622
NGC 5128 Group
NGC 6193
NGC 6397
NGC 6709
NGC 752
NGC 891
niacin
niccolite
Nicholas of Cusa (1401–1464)
Nicholson, Seth Barnes (1891–1963)
nickel
Nicol prism
Nicolle, Charles Jules Henri (1866–1936)
nicotine
nictitating membrane
Nim
Nimbus
Nimiq
nine
Nine Men's Morris
nine rooms paradox
nine-point circle
niobium
Nirenberg, Marshall Warren (1927–2010)
nitrate
nitration
nitric acid
nitrile
nitrobenzene
nitrocellulose
nitrogen
nitrogen fixation
nitrogen tetroxide
nitrogen-based life
nitroglycerin
nitrous oxide
nivation
Niven, Larry (1938–)
Niven number
no boundary condition
NOAA (National Oceanic and Atmospheric Administration)
Nobel, Alfred Bernhard (1833–1896)
nobelium
Nobeyama Radio Observatory (NRO)
Nobili, Leopoldo (1784–1835)
noble gas
noble metal
noctilucent clouds
node
Noether, Emmy (Amalie) (1882–1935)
noise
non-Abelian
nonagon
non-baryonic matter
noncorporeal life
non-Euclidean geometry
non-Hodgkin's lymphoma
non-Hodgkin's lymphoma treatment
nonlinear system
nonmetal
non-orientable surface
non-radial pulsation
nonsense mutation
nonstandard analysis
non-steroidal anti-inflammatory drug
non-thermal radiation
non-verbal communication
noon
Noordung, Herman (1892–1929)
noradrenaline
norite
Norma (constellation)
normal distribution
normal number
norovirus infection
North America Nebula (NGC 7000)
North Pole
northern blot
northern grasslands
northern pine forests
northern temperate woodlands
nose
NOSS (Naval Ocean Surveillance Satellite)
nothing
notochord
nova
Nova (rocket)
Nova (satellites)
Nova Cygni 1975 (V1500 Cygni)
Nova Persei 1901 (GK Persei)
Nova Herculis 1934
Nozomi
nozzle
NP-hard problem
NRAO
NRAO Green Bank
NRX (nuclear reactor series)
NSTAR
nucellus
nuclear detection satellites
nuclear energy
nuclear envelope
nuclear fission
Nuclear Furnace 1 (reactor)
nuclear fusion
nuclear heart scan
nuclear magnetic resonance
nuclear power for spacecraft
nuclear propulsion
nuclear pulse rocket
nuclear reaction
nuclear reactor
Nuclear Rocket Development Station (NRDS)
nuclear-electric propulsion
nuclease
nucleation
nucleic acid
nucleolus
nucleon
nucleophile
nucleoside
nucleosynthesis
nucleotide
nucleus (atomic)
nucleus (cell)
nuclide
nuee ardente
Nuffield Radio Astronomy Laboratory
nulling interferometry
number
number patterns
number system
NUMBER THEORY
number theory
NUMBERS, NOTABLE
numbers, 1 to 20
NUMBERS, TYPES
numeral
numerator
Nunki (Sigma Sagittarii)
NUSAT (Northern Utah Satellite)
NuSTAR (Nuclear Spectroscopic Telescope Array)
nut
nutation
nutrition
nyctinasty
nylon
nymph
Nysa-Polana family
nystagmus