天文学
astronomy, illusive object, cosmos宇宙, brown dwarf, gaseous bodies, planet, massive, ignite, star, heaven, celestial天体的, faint微弱的, universe, comet, meteor, astronomer, observatory天文台, telescope, image, astronomical object, remote, feeble微弱的, solar system, origin, gravitational force, molten, mars, space
责任编辑:小草