Answer: MOONS

AnswerCrossword Clue
MOONSAstronomer's sightings
MOONSPlanetary satellites
MOONSMars' pair
MOONSTitania and Oberon, e.g.
MOONSPlanet circlers
MOONSMars' twosome
MOONSGazes dreamily
MOONSSaturn's 31
MOONSNatural satellites
MOONSEuropa and Callisto
MOONSThey circle Saturn
MOONSLooks longingly
MOONSMercury's lack
MOONSDeimos and Phobos, to Mars
MOONSGanymede and Lysithea, to Jupiter
MOONSPhoebe and Rhea, to Saturn
MOONSResponds to "Bottoms up!"?
MOONSMonths.
MOONSSecondary planets.
MOONSActs lovesick.
moonsthe natural satellite of any planet
MOONSPlanetary orbiters
MOONSIo and Callisto
MOONSOrbiters of orbiters
MOONSIndulges in reverie
MOONSPhobos and Deimos, e.g.
MOONSStares wistfully into space
MOONSMany of Uranus's are named after Shakespearean characters
MOONSMercury and Venus lack them
MOONSMars pair
MOONSPlanet orbiters
MOONSStares absent-mindedly
MOONSSatellites
MOONSJupiter's Io and Callisto
MOONSGanymede and Europa
MOONSBrings up the rear?
MOONSButts out?
MOONSSome Lucky Charms marshmallow shapes
MOONSPeriods of time
MOONSNew and blue