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R association
R Canis Majoris star
R Coronae Borealis star
R Leonis
R Sculptoris
R Scuti
"R" series of Russian missiles
R star
Rabi, Isidor Isaac (1898–1988)
rabies
racemic mixture
rad
radar
radar astronomy
radar meteor
RADARSAT
radar-visual UFO
radial artery
radial engine
radial nerve
radial pulsation
radial symmetry
radial velocity
radial velocity method
radian
radiant
radiation
radiation belt
radiation pressure
radiation sickness
radiation temperature
radiation therapy
radiation units
radiation-bounded nebula
radical
radical axis
radicle
radio
radio astronomy
RADIO ASTRONOMY AND COMMUNICATIONS
radio beacon
radio galaxy
radio interferometer
radio source
radio telescope
radio waves
radioactive series
radioactivity
radiocarbon
radiochemistry
radiograph
radioglyph
radioisotope
radioisotope heater unit (RHU)
radioisotope thermoelectric generator (RTG)
radiolarian
radiometer
radionuclide
radionuclide scanning
radiopanspermia
radioresistant
radiosensitive
radiosonde
radium
radius
radius (arm bone)
radius of gyration
radius vector
radon
Radose
Raduga
radula
RAE (Radiation Astronomy Explorer)
railroad
railways, early history
rain
rain outage
rain shadow
rainbow
raised beach
Raman, Chandrasekhar Venkata (1888–1970)
Raman effect
Raman spectroscope
Ramanujan, Srinivasa Aaiyangar (1887–1920)
ramjet
ramjet, interstellar
Ramo, Simon (1913–)
Ramsay, William (1852–1916)
Ramsden disk
Ramsey theory
ramus
random
random access memory (RAM)
random drift
random number
random walk
range (math.)
range finder
range safety officer
Ranger
ranging
Rankine, William John Macquorn (1820–1872)
Rankine scale
ranunculoid
Raoult, François Marie (1830–1901)
Raoult's law
rapid eye movement
rapid irregular variable
rare earth elements
Rasalhague (Alpha Ophiuchi)
Ra-Shalom (minor planet 2100)
ratchet
ratio
rational number
rationalism
ratite
Rauschenbach, Boris Viktovich (1915–2001)
raven paradox
ray
ray crater
Rayleigh, John William Strutt, Third Baron (1842–1919)
Rayleigh criterion
Rayleigh scattering
Rayleigh-Taylor instability
Raynaud's disease
R-class asteroid
reactance
reactant
reaction control system (RCS)
reaction engine
reaction mass
reaction nozzle
Reaction Research Society (RRS)
reaction wheel
reactionless drive
read-only memory (ROM)
real analysis
real number
real time
realgar
realism
realm
Réamur, René Antoine Ferchault de (1683–1757)
Reber, Grote (1911–2002)
receptor-mediated endocytosis
recessive
reciprocal
reciprocating engine
recombinant DNA
recombination
reconnaissance satellite
Recorde, Robert (c.1510–1558)
recovery (of a comet)
recovery (of a spacecraft)
rectangle
rectangular coordinates
rectifier
rectum
rectus abdominis
recursion
recursive function
recursively enumerable set
red algae
red Centaurs
red dwarf
red giant
red giant tip
red rain of Kerala
Red Rectangle
red shift
Red Spider Nebula (NGC 6537)
Red Square
red supergiant
red tide
Redi, Francesco (1626–1697)
redox potential
redox reaction
redox sensor
Redstone
reducing agent
reducing atmosphere
reductio ad absurdum
reduction
reductionism
redundancy
Reed, Walter (1851–1902)
reentrant angle
reentry
Reentry (test program)
reentry corridor
Reentry Flight Demonstrator (RFD)
REENTRY PHYSICS AND TERMINOLOGY
reentry thermal protection
reentry vehicle
reentry window
Rees, Eberhard Friedrich Michael (1909–1998)
refining
reflecting binary
reflecting telescope
reflection
reflection nebula
reflector
reflex
reflex angle
reflex arc
reflexible
refracting telescope
refraction
refractive index
refractometer
refractor
refractory
refrigeration
refugium
regelation
regenerated disk
regeneration
regenerative cooling
regimes of flight
register
regmaglypt
Regnault, Henri Victor (1810–1878)
regolith
regression of nodes
regressive burning
regular expression
regular polyhedron
Regulus
relative atomic mass
relative molecular mass
relative permeability
relative sunspot number
relatively prime
relativistic
relativistic beaming
relativistic effects
relativistic quantum field theory
relativity theory
relaxation
Relay
relief
rem
remaining mass
Remek, Vladimir (1948–)
remote control
Remote Manipulator System (RMS)
remote sensing
remote sensing satellite
renal
renal dialysis
rendezvous
Rendezvous with Rama
renin
rennet
renormalization
repdigit
repeater
replicator
representation theory
repressor
reproduction
reproductive system
rep-tile
reptile
rep-unit
RESEARCH FACILITIES AND ESTABLISHMENTS
resin
resistance, electrical
resistivity
resistojet
resistor
Resnik, Judith A. (1949–1986)
resolution
resolution bandwidth
resolving power
resonance (in acoustics and physics)
resonance (in chemistry)
resonance (orbital)
resorcinol
respiration
respiratory distress syndrome
respiratory failure
respiratory system
rest mass
resting potential
restless legs syndrome
restriction enzyme
resultant
resurfacing
Resurs
reticular formation
reticulite
reticulo-endothelial system
Reticulum (constellation)
retina
retinal
retort
retrograde (motion)
retrolental fibroplasia
retrorocket
retrovirus
retting
Reuleaux polytope
Reuleaux Triangle
reusable launch vehicle (RLV)
Reutersvärd, Oscar (1915-2002)
revolution
REX (Radiation Experiment)
Reynaud, Jean (1806–1863)
Reynolds, James Emerson (1844–1920)
Reynolds number
Rh incompatibility
Rhea
rhenium
rheostat
rhesus factor
RHESSI (Reuven Ramaty High Energy Solar Spectroscopic Imager)
Rheticus (1514–1574)
rheumatic fever
rheumatoid arthritis
Rhind papyrus
rhinitis
rhizome
Rho1 Cancri (55 Cancri)
Rho Cassiopeiae
Rho Coronae Borealis
Rho Ophiuchi Nebula
rhodium
rhodopsin
rhomboid
rhombus
rhynchocephalia
rhyolite
Rhyolite/Aquacade
rib
rib-cage
riboflavin
ribonucleic acid
ribose
ribosomal DNA
ribosomal RNA
ribosome
ribozymes
Riccioli, Giovanni Battista (1598–1671)
rice paper
rich cluster of galaxies
Richards, Theodore William (1868–1928)
Richardson, Owen Willans (1879–1959)
richest field telescope (RFT)
Richter, Hermann Eberhard (1808–1876)
Richter scale
rickets
Rickettsia
Ride, Sally Kristen (1951–2012)
Riedel, Klaus (1901–1944)
Riemann, (Georg Friedrich) Bernhard (1826–1866)
Riemann hypothesis
Riemann integral
Riemann sphere
Riemann surface
Riemann zeta function
Riemannian geometry
rift valley
rift zone
Rigel (Beta Orionis)
Rigel Kentaurus
right
right ascension
rigidity
rigor mortis
rille
rima glottidis
ring (mathematical)
ring, planetary
ring galaxy
Ring Nebula (M57, NGC 6720)
ringworld
Ringworld
ringworm
Ritchey-Chrétien telescope
Rithmomachia
Ritter, Johann Wilhelm (1776–1810)
Rittenhouse, David (1732–1796)
river
river-crossing problems
riveting
RME (Relay Mirror Experiment)
RNA (ribonucleic acid)
"RNA world"
Robby the Robot
Robert's Quartet
Robinson, Abraham (1918–1974)
robot
Roche limit
Roche lobe
Rochon prism
rock
rocket
ROCKET ENGINE TYPES
ROCKET ENGINEERS AND SPACE SCIENTISTS
rocket equation
rocket plane
rocket principle
rocket propulsion
Rocket Racing League
rocket sled
Rocketplane Kistler
ROCKETRY, HISTORY
ROCKETRY, TERMINOLOGY
ROCKETS, MISSILES, AND LAUNCH VEHICLES
rockoon
Rockot
Rockwell
Rocky Mountain spotted fever
rod cell
Roddenberry, (Eu)Gene Wesley (1921–1991)
Rodentia
rogue planet
rogue star
Rohini
Rolle's theorem
Rolls-Royce Thrust-measuring Rig ("flying bedstead")
Roman numerals
Romb
Rømer, Ole (1644–1710)
Ronchi test
Röntgen, Wilhelm Carl (1845–1923)
röntgen (R)
rooks problem
Roosa, Stuart A. (1933–1994)
root (mathematical)
root (plant)
root of unity
rope
rope-around-the-Earth puzzle
Roque de los Muchachos Observatory (ORM)
rorqual whale
RORSAT (Radar Ocean Reconnaissance Satellite)
Rosalind
Rosamund's Bower
ROSAT (Roentgen Satellite)
rose curve
Rosen, Milton W. (1915–)
Rosetta
Rosette Nebula (NGC 2237-2239, 2246)
Rosny, J. H. (the Elder) (1856–1940)
Ross, Frank Elmore (1874–1960)
Ross, H(arry) E.
Ross, Ronald (1857–1932)
Ross 128
Ross 154
Ross 248
Rosse, Third Earl of (William Parsons) (1800–1867)
Rossi, Bruno Benedetto (1905–1993)
rostrum
Roswell Incident
Roswell Incident, GAO report
Roswell Incident, USAF rport
rotating variable
rotation
rotation curve
rotation period
rotator cuff
rotavirus infection
Rothrock, Addison M. (1903–1971)
Roton
rotor
roulette
round
round window
rounding
round-off error
round-trip light time (RLT)
roundworm
Roux, Pierre Paul Émile (1853–1933)
Rover, Project
Rowland, Henry Augustus (1848–1901)
Royal Astronomical Society
Royal Greenwich Observatory
Royal Institution
RP-1 (rocket propellant 1)
RP-318
r-process
RR Lyrae star
rRNA
RS Canum Venaticorum star
RS Ophiuchi
RTG
rubber
rubble-pile asteroid
rubella
rubidium
Rubik's Cube
ruby
Rucker, Rudy (Rudolf von Bitter) (1946–)
rudaceous
Rudolph, Arthur L. (1906–1996)
Ruggieri, Claude (fl. early 19th century)
ruled surface
rumble
Rumford, Benjamin Thompson, Count (1753–1814)
ruminant
runaway greenhouse effect
runaway star
runner
Ruppelt, Captain Edward J. (1922–1960)
R.U.R. (Rossum's Universal Robots)
Russell, Bertrand Arthur William (1872–1970)
Russell, Henry Norris (1877–1957)
Russell's paradox
Russian launch sites
Russian launch vehicles
Russian manned lunar programs
Russian multiplication
Russian Space Agency (RKA)
Russian Space Research Institute (IKI)
rust
Rutan, Elbert L. "Burt" (1943–)
ruthenium
Rutherford, Ernest (1871–1937)
Rutherford's experiment and atomic model
rutherfordium
rutile
Ruzicka, Leopold Stephen (1887–1976)
RV Tauri star
RXTE (Rossi X-ray Timing Explorer)
Rydberg, Johannes Robert (1854–1919)
Ryle, Gilbert (1900–1976)
Ryle, Martin (1918–1984)
Rynin, Nikolai Alexsevitch (1887–1942)
Ryusei