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Definitions of X:
  • noun:   the 24th letter of the Roman alphabet
  • noun:   the cardinal number that is the sum of nine and one; the base of the decimal system
  • noun:   street names for methylenedioxymethamphetamine
  • adjective:   being one more than nine



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Alternative Terms
quasar electromagnetic-radiation rocket-astronomy satellite-astronomy x-ray extragalactic milky-way-galaxy supernova-remnant large-magellanic-cloud-2 crab-nebula neutron-star pulsar supernova luminosity subluminous-star accretion thermonuclear emit binary-star black-hole cataclysmic-variable white-dwarf-star continuum astrophysics-high-energy galaxy-external atmosphere sun star cosmic-background-radiation galaxy white-dwarf variable-star space-station comet milky-way moon-in-x-rays-gif rosat fluorescence occultation moon astronomy-dragonland-album earth-disambiguation upper-atmosphere balloon satellite gas temperature river-kelvin atom electron energy scorpius-x constellation scorpius riccardo-giacconi nobel-prize-in-physics 2002 wavelength-3 compact-star gravity gravitational-field-2 mass photon-2 paper-krayzie-bone-song nose-cone white-sands-missile-range new-mexico v-2 navy aerobee field-of-view united-states australia hiregs-jpg sea-level electromagnetic-spectrum mcmurdo-station antarctica orbit xmm-newton european-space-agency nasa swift-gamma-ray-burst-mission chandra-x-ray-observatory smart-2 einstein-observatory advanced-satellite-for-cosmology-and-astrophysics bepposax charge-coupled-device calorimeter active-galactic-nucleus solar-system event-horizon angular-momentum density speed-of-light magnetic-field dark-matter kinetic-energy potential-well