Strange sightings, for short

• Subjects of some supposed government cover-ups
• Weather balloons, to some viewers
• ET carriers
• Saucers of a sort
• "Mars Attacks!" vessels
• Saucers in the sky
• Aliens' craft, for short
• The X-Files subjects
• Mysterious sightings that hover

Wiktionary Word definitions in Wiktionary
n. (plural of ufo English)