Definition of galactic in English:



  • 1Relating to a galaxy or galaxies, especially the galaxy containing the solar system.

    ‘the search for a black hole at the galactic centre’
    • ‘In fact, the Universe as observed today seems to have barely a fraction of the mass needed to keep galaxies from flying apart, based on the rotations of the stars in the galaxy about the galactic center.’
    • ‘The galactic centre of our galaxy is one of Integral's prime targets.’
    • ‘Our Milky Way galaxy is gobbling up its galactic neighbor, Sagittarius, and scientists this week offered documentary proof of this continuing cosmic cannibalism.’
    • ‘The space radiation environment encompasses a broad spectrum of radiation ranging from infra-red to galactic cosmic radiation.’
    • ‘Radiation could perhaps be a show-stopper because the environment in space - there's galactic cosmic rays.’
    • ‘However, there are larger explosions, notably those that go on in the middle of active galactic nucleii, like quasars.’
    • ‘The second are galactic cosmic rays, which, although not as lethal as solar flares, represent a continuous background radiation to which the crew would be exposed.’
    • ‘Other sources that contribute to the near-Earth space environment include galactic cosmic ray particles, which originate from outside of the solar system.’
    • ‘By contrast, to reach our nearest galactic neighbor, the Andromeda galaxy, you'd need only twenty-five Milky Ways.’
    • ‘The galactic centre can only be observed at certain wavelengths, such as X-rays, because large amounts of dust lie in our line of sight and this blocks out optical light.’
    • ‘A coil of a superconducting material could produce a substantial magnetic field, which could, in turn, deflect the energetic galactic cosmic radiation.’
    • ‘They are produced in the atmosphere by the interaction of galactic cosmic rays with the atoms of the atmosphere.’
    • ‘It was possibly the most important observation but it was just personal observation to sample the glory and the majesty of the galactic plain and the centre of the galaxy.’
    • ‘Why, given its exceedingly smooth beginnings, is the universe so clumpy, on all scales from galaxies to galactic superclusters?’
    • ‘They compared the observed shape in space of 160,000 galaxies to models of galactic distribution that incorporated various masses for the neutrino.’
    • ‘The cyclical nature of our weather changes point to the variables in our solar system and even galactic variations.’
    • ‘If accurate, this new view of galactic demography might force astronomers to rethink the fundamentals of galaxy formation.’
    • ‘A record of the long term variations of the galactic cosmic ray flux can be extracted from Iron meteorites.’
    • ‘In fact, the Sun is at an optimal distance from the galactic centre, called the co-rotation radius.’
    • ‘But even shielding does little good against so-called galactic cosmic radiation, which originates in deep space.’
    1. 1.1Astronomy Measured relative to the galactic equator.
      ‘the south galactic pole’
      • ‘This map is plotted in galactic coordinates - the plane of the Milky Way galaxy passes across the middle of this chart with the zero point of galactic latitude and longitude pointing directly at the galactic centre.’
      • ‘Out past Fomalhaut, toward the south galactic pole, the stars fade.’


Mid 19th century: from Greek galaktias (variant of galaxias ‘galaxy’) + -ic.