protoplanetary Definition

planetesimal, giant planet, minor planet, major planet, binary star, white dwarf, oort cloud, planetary nebula, extrasolar, planetary, extraterrestrial object, nebular, intersidereal, inferior planet, inner planet, binary system, superior planet, andromeda galaxy, neutron star, spiral nebula, outer planet, terrestrial planet, magellanic cloud, celestial sphere, proxima centauri, gravitational collapse, interplanetary space, milky way galaxy, spiral galaxy, multiple star, asteroid belt, small magellanic cloud, large magellanic cloud, crab nebula, galilean satellite, giant star, lunar crater, circumjovial, gravitational interaction, astrosphere, gas giant, interstellar, hubble law, interstellar space, supermassive, exoplanet, meteoroidal, proper motion, visual binary, galactic, celestial body, gravitational force, copernican system, cometary, interplanetary medium, triangulum australe, cosmic background radiation, asteroid, orbitar, stelliform, light year, ptolemaic system, dwarf star, corona australis, regrede, absolute magnitude, herschelian, extragalactic, star chart, intragalactic, cepheid variable, earthlike, apocynthion, naked singularity, atmospherology, radio galaxy, little bear, gravitational, alpha centauri, cometology, chromatoscope, orbital plane, disorb, gravitational field, jovian, coma berenices, natural object, intergalactic space, astronomy unit, solar system, solar prominence, jovian planet, mesoseme, corona borealis, stellar, astronomical unit, cosmoplastic, astrognosy, lacertid, sidereal time,