• 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
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