astronomical unit
pl: astronomical units
Related Words
astronomydistanceorbitsunearthplanetsolar systemmeasurementmetricscaleradiusperihelionaphelionlight yearparseckilometermilevacuumgravityellipseeccentricityvelocityspeedtrajectorycosmosuniversegalaxystarasteroidcometmeteorsatellitemoonheliospherephotonradiationtelescopeobservatoryastrophysicscelestialzenithnadirparallaxmagnitudeluminosityspectrumepochcoordinateazimuthdeclinationright ascensionequinoxsolsticerotationrevolutionperiodmassdensityvolumeinertiamomentum