• machine
• machine readable form
• macroturbulence
• 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 configuration
• magnetic crochet
• magnetic declination
• magnetic deviation
• magnetic dip
• magnetic dipole
• magnetic dipole radiation
• magnetic disturbance
• magnetic elements
• magnetic energy density
• magnetic equator
• magnetic field
• magnetic field configuration
• magnetic field strength
• magnetic flux in spot
• magnetic focusing
• magnetic foreshortening
• magnetic horizon
• magnetic latitude
• magnetic life history of sun-spot
• magnetic longitude
• magnetic moment
• magnetic multipole
• magnetic multipole radiation
• magnetic permeability
• magnetic perturbation
• magnetic polarity
• magnetic pole
• magnetic pressure
• magnetic quadrupole
• magnetic quadrupole radiation
• magnetic quantum number
• magnetic resonance spectrum
• magnetic star
• magnetic storm
• magnetic tape
• magnetic variable
• magnetic variable star
• magnetic zenith
• magnetism
• magneto-bremsstrahlung
• magnetobremsstrahlung radiation
• magnetogram
• magnetograph
• magneto-gyric ratio
• magnetohydrodynamics
• magnetohydrodynamic shock wave
• magnetohydrodynamic waves
• magnetohydrostatic theory
• magnetoionic theory
• magnetometer
• magneton
• magneto-optic
• magnetorotation effect
• magnetosphere
• magnetospheric boundary
• magnetoturbulence
• magnification
• magnification coefficient
• magnified image
• magnifier
• magnifying power
• magnitude
• magnitude determination
• magnitude difference
• magnitude distribution
• magnitude equation
• magnitude error
• magnitude of maximum
• magnitude of minimum
• magnitude scale
• magnitude screen
• 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
• major axis
• major flare event
• major planets
• major spot
• make-up
• Maksutov camera
• Maksutov system
• Maksutov telescope
• manifold of points
• man-made satellite
• manned artificial satellite
• manned spaceship
• manned space ship
• manned space vehicle
• mantle
• mantle of the Earth
• manual control
• map
• map of galactic radio emission
• map of hydrogen in galactic plane
• map of radio brightness
• map of sky
• mapping
• mapping system
• March equinox
• mare
• marginal rays
• marginal zone
• maria
• mariner's compass
• marine sextant
• mark
• marking
• Mark I radio telescope
• Markowitz camera
• Mars at near approach
• Martian
• Martian atmosphere
• Martian canals
• Martian day
• Martian probe
• maser
• maser amplifier
• maser-like enhancement of lines
• maser noise
• maser radiometer
• maser receiver
• maser system
• masking aperture
• mass
• mass absorption coefficient
• mass-action effect
• mass balance
• mass coefficient
• mass defect
• mass density
• mass distribution
• mass effect
• mass exchange
• mass function
• mass horizon
• 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
• mast
• matching
• material
• material particle
• matrix
• matrix mechanics
• matter
• matter of arbitrariness
• mature prominence
• Maui Space Surveillance system
• Mauna Kea observatory
• maxima
• maximum
• maximum activity
• maximum brightness
• maximum corona
• maximum entropy method
• maximum light
• maximum phase of solar cycle
• Max Plank institutes
• Maxwell-Boltzmann distribution
• Maxwell distribution
• Maxwellian distribution
• Maxwellian distribution law
• Mayal telescope
• M-burst
• McDonald observatory
• McIntosh classification
• McMath-Pierce solar telescope
• M-disturbance
• MDM observatory
• mean
• mean angular motion
• mean anomaly
• mean atomic weight
• mean coefficient
• mean coordinate
• mean declination
• mean density
• mean density of matter
• mean distance
• mean ecliptic
• mean epoch
• mean equator
• mean equinox
• mean error
• mean intensity
• mean latitude
• mean life time
• mean longitude
• mean magnitude
• mean molecular weight
• mean motion relative to the Sun
• mean noon
• mean orbit
• mean parallax
• mean place
• mean position
• mean radius
• mean refraction
• mean right ascension
• mean sidereal time
• mean solar day
• mean solar second
• mean solar time
• mean Sun
• mean Sun-Earth distance
• mean time
• mean value
• mean velocity
• mean wavelength
• measure
• measured coordinates
• measurement
• measurement of seeing
• measuring device
• measuring engine
• measuring instrument
• measuring machine
• measuring microscope
• measuring screw
• measuring wire
• mechanical drive
• mechanical equilibrium
• mechanics
• mechanism
• mechanism of origin
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• mechanism of radio emission
• median parallax
• medium
• megacycle per second
• mega-electron-volt
• Megantic observatory
• megaparsec
• Melipal
• MEM
• member galaxy
• member of the solar system
• member stars
• membrane
• ME model
• memory
• meniscus
• meniscus astrograph
• meniscus corrector plate
• meniscus lens
• meniscus lens with concentric surfaces
• meniscus system
• meniscus telescope
• mercury
• Mercury
• mercury basin
• mercury horizon
• mercury lamp
• mercury sensitization
• mercury surface
• meridian
• meridian astronomy
• meridian circle
• meridian-circle observations
• meridian distance
• meridian instrument
• meridian interferometer
• meridian mark
• meridian mark readings
• meridian mounted reflector
• meridian observations
• meridian passage
• meridian place
• meridian plane
• meridian room
• meridian telescope
• meridian transit
• meridional current
• meridional focus
• merit
• Mersenne system
• mesh
• mesopause
• mesopic vision
• mesosphere
• Messier catalog
• Messier number
• metagalaxy
• metal
• metal film
• metallic
• metallic interference filter
• metallic lines
• metallic-line star
• metallic mirror
• metallic prominence
• metal mesh
• metal mirror
• metal-on-glass filter
• metal-on-glass mirror
• metastability
• metastable atom
• metastable level
• metastable state
• meteor
• meteor activity
• meteor astronomy
• meteor brightness
• meteor camera
• meteor column
• meteor crater
• meteor detection
• meteor diameter
• meteor echo
• meteor-echo record
• meteor from outer space
• meteoric
• meteoric astronomy
• meteoric body
• meteoric bombardment
• meteoric collisions
• meteoric dust
• meteoric echo
• meteoric evidence
• meteoric heights
• meteoric impact
• meteoric ionization
• meteoric material
• meteoric matter
• meteoric origin
• meteoric particle
• meteoric phenomenon
• meteoric storm
• meteoric theory
• meteoric velocity
• meteor ionization
• meteorite
• meteorite crater
• meteorite theory
• meteoritic
• meteoritic bombardment
• meteoritic dust
• meteoritic impact
• meteoritic material
• meteoritics
• meteor observations
• meteoroid
• meteorological conditions
• meteorological factors
• meteorological satellite
• meteorological station
• meteor orbit
• meteor phenomenon
• meteor photograph
• meteor photography
• meteor physics
• meteor radar
• meteor radiant
• meteor radio astronomy
• meteor research
• meteor shower
• meteor spectrograph
• meteor spectrum
• meteor's speed
• meteor stream
• meteor stream radiant
• meteor studies
• meteor track
• meteor trail
• meteor train
• meteor velocity
• meteor velocity determination
• meter
• meter band
• meter component
• meter emission
• metering device
• metering system
• meter observations
• meter radio waves
• meter range
• meter sensitivity
• meter spectrum
• 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
• methane
• 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
• metol developer
• Metonic cycle
• metre
• metric
• metrical tensor
• metrics
• metric tensor
• Michelson's interferometer
• Michelson spectroscope
• Michelson stellar interferometer
• Michigan radio observatory
• microchannel plate
• microdensitometer
• microflare
• micrometeorite
• micrometeorite counter
• micrometeorite experiment
• micrometeorite gage
• micrometer
• micrometer screw
• micrometer setting
• micrometer thread
• micrometric microscope
• micron
• microphotometer
• microphotometer trace
• microphotometer tracing
• microscope
• microscope micrometer
• microscope mounting
• microscope objective
• microscope stage
• microthermal seeing
• microturbulence
• microwave
• microwave burst
• microwave component
• microwave emission
• microwave frequencies
• microwavelengths
• microwave link
• microwave links interferometer
• microwave observations
• microwave outbursts
• microwave radiation
• microwave radiometer
• microwave range
• microwave region
• microwaves
• microwave solar noise
• microwave spectrometer
• microwave spectroscopy
• microwave spectrum
• microwave temperature
• middle corona
• mid infrared
• midnight
• migration
• millenium
• milli-Kayser
• millimeter band
• millimeter observations
• millimeter range
• millimeter spectrum
• millimeter wave
• millimeter wavelength band
• millimeter wavelength range
• millimeter wavelength region
• millimeter wavelengths
• millimeter-wave spectrum
• millionth of solar disk
• millionth of visible hemisphere
• millisecond
• Mills cross
• Mills cross antenna
• Mills radiometer
• Mills system
• Milne-Eddington model
• minicooler
• minimum
• minimum corona
• minimum detectable signal
• minimum light
• minimum magnification
• minimum operating wavelength
• minor axis
• minor-lobe radiation
• minor lobes
• minor planet
• minor planet belt
• Minor planet center
• minute
• minute of arc
• minute of time
• Mira Ceti variables
• Mira stars
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• mirror
• mirror back
• mirror back pad
• mirror blank
• mirror cell
• mirror coating
• mirror disk
• mirror edge pad
• mirror end of tube
• mirror face
• mirror figure
• mirror filter
• mirror galvanometer
• mirror-handling carriage
• mirror holder
• mirroring altitude
• mirror insulation
• mirror-lens telescope
• mirror material
• mirror nucleus
• mirror objective
• mirror pad
• mirror point
• mirror supports
• mirror-support system
• mirror-support unit
• mirror surface
• mirror table
• mirror telescope
• mirror transit circle
• missing band
• missing level
• missing line
• missing state
• mixer
• mixing
• mixing of matter
• MKK system
• MMT
• mobile antenna
• mobile reflector
• mock sun
• model
• model atmosphere
• modeling
• model of the universe
• model solar atmosphere
• model solar chromosphere
• model stellar atmosphere
• model universe
• moderately directive antenna
• moderately good seeing
• moderate telescope
• modern astronomy
• modern cosmology
• modification
• modified achromat eyepiece
• modified English mounting
• modified Julian date
• modulation
• modulation collimator
• modulation transfer function
• modulator
• modulus
• Mohorovicic discontinuity
• moist
• moisture
• molecular band
• molecular beam
• molecular-beam magnetic resonance method
• molecular conduction
• molecular constants
• molecular diffusion
• molecular dissociation
• molecular excitation
• molecular hydrogen
• molecular line
• molecular orbit
• molecular orbital
• molecular orbit method
• molecular partition function
• molecular quantum number
• molecular scattering
• molecular spectroscopy
• molecular spectrum
• molecular weight
• molecule
• molten material
• molten surface
• moment
• momental ellipsoid
• moment of impact
• moment of inertia
• moment of momentum
• momentum
• monad
• monitor
• monitor photoelectric cell
• monocentric eyepiece
• monochromatic
• monochromatic absorption
• monochromatic emission
• monochromatic film
• monochromatic filter
• monochromatic flux
• monochromatic image
• monochromatic intensity
• monochromatic light
• monochromatic radiation
• monochromatic radiative equilibrium
• monochromatic sensitivity
• monochromatic vision
• monochromator
• monochrome picture
• monocular vision
• month
• monthly phase cycle
• moon
• moon camera
• mooncar
• Moon-Earth distance
• moon echo
• moonless
• moonless night
• moonlight
• moon-position camera
• moon probe
• Moon program
• Moon programme
• Moon radar
• moonrise
• moonrocket moonrise
• Moon's atmosphere
• Moon's crust
• Moon's disk
• Moon's distance
• Moon's escape velocity
• moonset
• Moon's libration
• Moon's limb
• Moon's magnetic field
• Moon's motion
• Moon's orbit
• Moon's radiation
• Moon's shadow
• Moon's surface
• Moon's surface temperature
• Moon's temperature
• Moon's umbra
• Moon work
• Morgan-Keenan classification
• morning star
• Morpa observatory
• Moseley diagram
• Moseley law
• motion
• motion fast
• motion of perihelion
• motion of perihelion point
• motion pictures
• motion very large
• motor
• motor driven thread
• motorized focus mechanism
• mottles
• mount
• mountain
• mountainous regions
• mountain peak
• mountain range
• Mount Graham observatory
• Mount Hopkins observatory
• mounting
• mounting screw
• Mount John University observatory
• Mount Palomar observatory
• Mount Stromlo and Siding springs observatory
• Mount Wilson classification
• Mount Wilson observatory
• moustaches
• movable antenna
• movable floor
• movable image
• movable jaw
• movable reflector
• movable wire
• movement
• movements of ionization
• movie-camera
• moving axis
• moving cluster
• moving cluster method
• moving film
• moving-film camera
• moving floor
• moving image
• moving mirror
• moving parsecs
• moving plate
• moving-plate camera
• moving plate carriage
• moving stage
• M-radiation
• M-series
• M-shell
• MSH source
• MS star
• MTF
• M-type star
• Mullard Radio Astronomy Observatory
• multialkali cathode
• multialkali cell
• multialkali photocathode
• multichannel
• multi-channel photometer
• multichannel photometer
• multichannel radiometer
• multichannel receiver
• multi-coated optics
• multicolor photometry
• multicolor system
• multielement
• multielement array
• multielement interferometer
• multielement interferometry
• multilayer coating
• multilayer emulsion
• Multi-mirror telescope
• multi-object spectroscopy
• multiple exposure
• multiple galaxy
• multiple interferometer
• multiple ionization
• multiple object
• multiple receiver
• multiple scattering
• multiple star
• multiple system
• multiplet
• multiple tails
• multiplet component
• multiplets of bands
• multiplets of lines
• multiplet splitting
• multiplet structure
• multiple-wave interferometer
• multiple-wave system
• multiplex advantage
• multiplication
• multiplicity
• multiplicity alteration
• multiplier
• multiplier phototube
• multiplier tube
• multipolar group
• multipole
• multistage
• multivibrator
• multivibratron
• muon
• mural quadrant
• mutual attraction
• mutual interaction of states
• MW
• MW types
• Mylar film
• M-
• M-
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