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1969 "M"

plate measuring machine
machine readable form
tilting screen made of slats
Magellan telescopes
magic number
magnetic activity
magnetically active days
magnetically disturbed days
magnetically driven shock wave
magnetically quiet days
magnetic amplifier
magnetic axis
magnetic bearing
magnetic classification
magnetic crochet
magnetic declination
magnetic deviation
magnetic dip
magnetic dipole
magnetic dipole radiation
terrestrial magnetic disturbance
magnetic elements
magnetic energy density
magnetic equator
transversal magnetic field
magnetic (field) configuration
magnetic field strength
magnetic flux in spot
magnetic focusing
magnetic foreshortening
magnetic horizon
planetary magnetic Kp-index
magnetic latitude
magnetic life history of sun-spot
magnetic longitude
magnetic moment
magnetic multipole
magnetic multipole radiation
magnetic permeability
magnetic perturbation
reversal of magnetic polarity
magnetic pole
magnetic pressure
magnetic quadrupole
magnetic quadrupole radiation
magnetic quantum number
unipolar magnetic region
proton magnetic resonance
molecular-beam magnetic resonance method
magnetic resonance spectrum
solar quiet magnetic secular
variable magnetic star
terrestrial magnetic storm
magnetic tape
magnetic variable
magnetic variable star
lunar quiet magnetic variation
magnetic zenith
magnetobremsstrahlung radiation
solar magnetograph
magneto-gyric ratio
magnetohydrodynamic shock wave
magnetohydrodynamic waves
magnetohydrostatic theory
magnetoionic theory
nuclear magneton
magnetorotation effect
magnetospheric boundary
minimum magnification
magnification coefficient
magnified image
hand magnifier
magnifying power
U, B, V magnitude
magnitude determination
magnitude difference
magnitude distribution
absolute magnitude effect
magnitude equation
magnitude error
magnitude of maximum
magnitude of minimum
magnitude scale
magnitude screen
first magnitude star
magnitude system
Maidanak observatory
main beam
main bearing
main branch
main control desk
main gear drives
main image
main lobe
main magnetic field
main mirror
main observatory
main peak
main pencil beam
main phase
main sequence
main sequenceof star types
main sequence star
main source
main telescope
semi major axis
major flare event
β Canis Majoris star
major planets
major spot
telescope making
Maksutov camera
Maksutov system
Maksutov telescope
manifold of points
man-made satellite
manned artificial satellite
manned space ship
manned spaceship
manned space vehicle
Earth's mantle
mantle of the Earth
manual control
terrestrial map
map of galactic radio emission
map of hydrogen in galactic plane
map of radio brightness
map of sky
radio map of the Galaxy
mapping system
March equinox
marginal rays
marginal zone
mariner's compass
marine sextant
reference mark
Mark I radio telescope
Markowitz camera
meridian mark readings
time marks
Mars at near approach
Martian atmosphere
Martian canals
Martian day
Martian probe
solid-state maser
maser amplifier
maser-like enhancement of lines
maser noise
ruby maser radiometer
maser receiver
maser system
Hartmann mask
Hadamard mask imaging
unsharp masking
masking aperture
total neutral hydrogen mass
mass absorption coefficient
mass-action effect
mass balance
mass coefficient
mass defect
mass density
mass distribution
mass effect
total mass energy
mass exchange
mass function
mass horizon
hidden mass in the galaxy
mass-luminosity correlation
mass-luminosity diagram
mass-luminosity law
mass-luminosity relation
mass of hydrogen atom
mass-radius relation
mass ratio
mass scattering coefficient
mass shift
mass spectrography
mass spectrometer
mass spectrometry
mass spectroscopy
mass spectrum
feed mast
color matcher
stellar material
material particle
Butler matrix
Dirac matrixes
matrix mechanics
outflow of matter
matter of arbitrariness
mature prominence
Maui Space Surveillance system
Mauna Kea observatory
diffraction maxima
half width at half maximum
maximum activity
maximum brightness
maximum corona
maximum entropy method
ratio of minimum to maximum in record
maximum light
ratio of minimum to maximum of interference fringes
sunspot maximum period
maximum phase of solar cycle
Max Plank institutes
Maxwell-Boltzmann distribution
Maxwell distribution
Maxwellian distribution
Maxwellian distribution law
James Clerk Maxwell telescope
Mayal telescope
McDonald observatory
McIntosh classification
McMath-Pierce solar telescope
MDM observatory
standard error of the mean
Rosseland mean absorption coefficient
Sun's mean angular diameter
mean angular motion
mean anomaly
Greenwich mean astronomical time
mean atomic weight
mean coefficient
mean coordinate
sidereal mean daily motion
mean declination
mean density
mean density of matter
mean distance
mean ecliptic
mean epoch
mean equator
mean equinox
quadratic mean error
mean intensity
mean latitude
mean life time
mean longitude
mean magnitude
sidereal time at mean midnight
mean molecular weight
mean motion relative to the Sun
mean noon
mean orbit
mean parallax
reduction from apparent place to mean place
mean position
mean radius
mean refraction
mean right ascension
radio means
Greenwich mean sidereal time
mean solar day
mean solar second
local mean solar time
mean Sun
mean Sun-Earth distance
mean time
mean value
mean velocity
mean wavelength
quantity measurable
emission measure
measured coordinates
uncertainty of measurement
measurement of seeing
spectroscopic measurements
seeing measures
visual measuring device
photoelectric measuring engine
measuring instrument
plate measuring machine
measuring microscope
measuring screw
measuring wire
mechanical drive
mechanical equilibrium
wave mechanics
thermal mechanism
mechanism of origin
mechanism of radio emission
control mechanisms
median parallax
space medicine
solar medium
megacycle per second
Megantic observatory
member galaxy
member of the solar system
member stars
reflecting membrane
ME model
transistorized memory
meniscus astrograph
meniscus corrector plate
meniscus lens
meniscus lens with concentric surfaces
meniscus system
meniscus telescope
transit of Mercury
high-pressure mercury arc
reflecting mercury basin
mercury horizon
mercury lamp
mercury sensitization
mercury surface
line merging
prime meridian
meridian astronomy
portable meridian circle
meridian-circle observations
meridian distance
meridian instrument
meridian interferometer
meridian mark
meridian mark readings
meridian mounted reflector
meridian observations
time of meridian passage
meridian place
meridian plane
meridian room
meridian telescope
meridian transit
meridional current
meridional focus
Mersenne system
wire mesh
mesopic vision
Messier catalog
Messier number
speculum metal
star of low metal content
metal film
metallic interference filter
metallic lines
metallic-line star
metal(lic) mirror
metallic prominence
metal mesh
metal-on-glass filter
metal-on-glass mirror
transition group metals
metastable atom
metastable level
metastable state
passage of meteor
meteor activity
meteor brightness
meteor camera
meteor column
meteor crater
meteor detection
meteor diameter
meteor-echo record
meteor from outer space
meteor(ic) astronomy
meteoric body
meteoric collisions
meteoric dust
meteor(ic) echo
meteoric evidence
meteoric heights
meteoric impact
meteor(ic) ionization
meteoric material
meteoric matter
meteoric origin
meteoric particle
meteor(ic) phenomenon
meteoric storm
meteoric theory
meteor(ic) velocity
stony-iron meteorite
meteorite crater
meteorite theory
meteor(it)ic bombardment
meteoritic dust
meteoritic impact
meteoritic material
optical meteor observations
meteorological conditions
meteorological factors
meteorological satellite
meteorological station
meteor orbit
meteor photograph
meteor photography
meteor physics
meteor radar
meteor radiant
delineation of meteor radiants
meteor radio astronomy
meteor research
storm of meteors
meteor shower
meteor spectrograph
meteor spectrum
meteor's speed
meteor stream
meteor (stream) radiant
meteor studies
meteor track
meteor trail
meteor train
meteor velocity determination
recording meter
meter component
metering device
metering system
meter observations
meter radio waves
meter sensitivity
meter-wave burst
meter(-wave) emission
meter (wavelength) band
meter wavelength radiation
meter (wavelength) range
meter wavelength receiver
meter wavelength region
meter wavelengths
meter-wave outbursts
meter waves
meter(-wave) spectrum
giant meter wave telescope
string method
method of dependences
method of emission
method of emission of radio waves
method of expansions
method of plate constants
method of recording transits
method of support
quantitative classification methods
metol developer
Metonic cycle
signature of metric
metric(al) tensor
1420 MHz line
Michelson's interferometer
Michelson spectroscope
Michelson stellar interferometer
Michigan radio observatory
geomagnetic micrepulsations
microchannel plate
micrometeorite counter
micrometeorite experiment
micrometeorite gage
bi-filar micrometer
micrometer screw
micrometer setting
micrometer thread
micrometric microscope
self-recording microphotometer
microphotometer trace
microphotometer tracing
visual microscope
microscope micrometer
microscope mounting
microscope objective
microscope stage
microthermal seeing
microwave burst
microwave component
microwave emission
microwave frequencies
microwave link
microwave links interferometer
microwave observations
microwave outbursts
microwave radiation
microwave radiometer
microwave range
microwave region
microwave solar noise
microwave spectrometer
microwave spectroscopy
microwave spectrum
microwave temperature
middle corona
mid infrared
Pic du Midi observatory
sidereal time at mean midnight
poleward migration of prominences
plane of the Milky Way
Atacama large millimeter array
millimeter observations
millimeter wave
millimeter (wavelength) band
millimeter (wavelength) range
millimeter wavelength region
millimeter wavelengths
millimeter(-wave) spectrum
Institut de radio astronomie millimetrique
diamond milling
millionth of solar disk
millionth of visible hemisphere
Mills cross
Mills cross antenna
Mills radiometer
Mills system