unusual, or difficult to understand
strange (adj) /streɪndʒ/
having the shape of a disk
disk-shaped (n) /dɪsk ʃeɪpt/
to become impossible to see
disappear (v) /ˌdɪsəˈpɪə(r)/
an object has a round shape in the sky that people think it comes from another planet
flying saucer (n) /ˌflaɪɪŋ ˈsɔːsə(r)/
extremely small
tiny (adj) /ˈtaɪni/
a creature from another planet
alien (n) /ˈeɪliən/
extremely large in size or amount
huge (adj) /hjuːdʒ/
very afraid
terrified (adj) /ˈterɪfaɪd/
Unidentified Flying Objects
UFO (n) /ˌjuː ef ˈəʊ/
to start to be seen
appear (v) /əˈpɪə(r)/