The term 'SKY SIGHTS' refers to the various sights that can be seen in the sky. The crossword solutions for this term are CLOUDS (6 letters), STARS (5 letters), SSTS (4 letters), UFOS (4 letters), and PLANETS (7 letters). CLOUDS are collections of water droplets or ice crystals that form in the atmosphere, while STARS are distant points of light in the night sky. SSTS stands for supersonic transport aircraft, which are aircraft that travel faster than the speed of sound. UFOS are unidentified flying objects, which are often reported as being of extraterrestrial origin. Finally, PLANETS are large celestial bodies that orbit around a star.