| danger sign early symptom falling barometer gathering clouds high sign omen precursor preliminary sign premonitory sign premonitory symptom prodroma prodrome quarantine flag red flag red light skull and crossbones storm petrel stormy petrel symptom thundercloud thunderhead warning sign warning signal yellow flag yellow jack |
| shooting star aerolite angry clouds black cat black clouds bolide broken mirror chondrite cosmic dust fireball gathering clouds halcyon bird meteor meteor crater meteor dust meteor shower meteor swarm meteor trail meteor train meteoric shower meteorite meteoroid meteorolite micrometeorite micrometeoroid owl radiant radiant point rainbow raven siderite siderolite storm clouds stormy petrel tektite thundercloud thunderhead |
| dark cloud Black Magellanic Cloud Crab Nebula angry clouds black cat black clouds bright diffuse nebula broken mirror coalsack dark nebula diffuse nebula dust cloud gaseous nebula gathering clouds halcyon bird nebula nebula of Lyra nebular hypothesis nebulosity nebulous stars owl planetary nebula rainbow raven ring nebula shooting star storm clouds stormy petrel the Coalsack thundercloud thunderhead |