protoplanet

noun 0.763

stellar disk

noun 0.710

accretion disk

noun 0.706

planetary system

noun 0.641

planetary ring

noun 0.629

planetesimal

noun 0.609

planetary nebula

noun 0.595

protostar

noun 0.591

planetary

noun 0.578

protosun

noun 0.573

inner planet

noun 0.546

interplanetary space

noun 0.539

terrestrial planet

noun 0.537

planetary science

noun 0.536

planetoid

noun 0.533

extrasolar planet

noun 0.533

microdisk

noun 0.530

disk

noun 0.530

outer planet

noun 0.529

dwarf planet

noun 0.523

cosmic dust

noun 0.516

planet

noun 0.513

planetary gear

noun 0.510

solar system

noun 0.506

molecular cloud

noun 0.504

particle horizon

noun 0.504

orbital plane

noun 0.500