Astronomy Vocabulary: What do YOU wonder about?

A albedo Alpha Centauri apastron aperature aphelion apogee asterism asteroid astronaut astronomer astronomical unit astronomy axial tilt azimuth B background radiation Bailey's beads big bang theory binary star black body black hole bolometer C celestial celestial equator cislunar cluster comet conjunction constellation coriolis force cosmic rays corona cosmology cosmonaut cosmos crater crescent moon D dark matter day declination deep space Deneb density docking Doppler shift double star Drake equation dust dwarf planet dwarf star E Earth earthbound eccentricity eclipse ecliptic elliptical orbit equinox escape velocity event horizon exoplanet extragalaxtic F falling star flare flyby free fall full moon G galaxy gamma ray gas giant gegenschein geostationary geosynchronous gibbous moon globular cluster gravitation gravitational constant gravitational lens gravity H half moon heliocentric hydrogen helium H-R diagram Hubble telescope Hubble's law hyperbolic orbit hypernova I ice giant inclination inertia inferior planets inner planets interstellar interstellar dust ionosphere J Jupiter K Kepler's laws kiloparsec Kirkwood gaps Kuiper belt L Lagrange points lens light-year local arm local group lunar M magnitude mare Mars mass Mercury meteor meteor shower meteorite meteoroid Milky Way minor planet Mir moon muttnik N nadir NASA nebula Neptune neutron star new moon north star nova O observatory occultation Oort cloud opposition orbit orbital eccentricity orbital inclination outer planets P parallax parsec partial eclipse penumbra perigee perihelion perturbation phase plane of the ecliptic planet planetary nebula planetoid Pluto pole star precession probe pulsar Q quarter moon quasar R radiant radiation red dwarf red giant star red shift revolve right ascension rings Roche limit rocket S satellite Saturn scientific notation scintillation shooting star solar sidereal singularity sky solar solar system solar wind solstice space space exploration space station spectroscope S cont. spectrum Sputnik star starlight sun sunspot superior planets supernova synodic syzygy T telemetry telescope terminator terrestrial total eclipse totality transit translunar transneptunians twinkling U umbra universe Uranus V vacuum Van Allen belt variable star Venus vernal equinox visual magnitude W waning wavelength waxing weightlessness white dwarf white giant wormhole X x-rays y yellow dwarf Z zenith zodiac