did he have any interest in aliens/unidentified flying objects?
Yes - he was reported to have seen unidentified flying objects.
Clyde Tombaugh
Tombaugh was probably the most eminent astronomer to have reported seeing unidentified flying objects. 
mention a few mythologies on planet? The Greeks made each planet sacred to one among their pantheon of gods, the Olympians: Helios and Selene were the names of both planets and gods; Phainon was sacred to Cronus, the Titan who fathered the Olympians; Phaethon was sacred to Zeus who is the entity mentioned at last who was sacred to zeus? Phaethon was the son of the Oceanid Clymene and the solar deity Helios in Greek mythology. was he mentioned in any of plato's work? Yes - in Plato's dialogue 'Timaeus' what is that work about? Speculation on the nature of the physical world and human beings in the dialogue, what are the properties mentioned in it for the universe? The four elements -earth, air, fire and water were shapeless, mixed and in constant motion. what was its influence later on? It influenced the construction of the creation accounts in the Book of Genesis. who is the author of the book mentioned above? UNANSWERABLE what are dwarf planets? A planetary-mass object that is neither a true planet nor a natural satellite name a few of these dwarfs? Ceres, Pluto who discovered the latter dwarf? Clyde Tombaugh name a few asteroids discovered by him? 2839 Annette
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Clyde Tombaugh [SEP] Interest in UFOs
Tombaugh was probably the most eminent astronomer to have reported seeing unidentified flying objects. On August 20, 1949, Tombaugh saw several unidentified objects near Las Cruces, New Mexico. He described them as six to eight rectangular lights, stating: "I doubt that the phenomenon was any terrestrial reflection, because... nothing of the kind has ever appeared before or since... I was so unprepared for such a strange sight that I was really petrified with astonishment.". Tombaugh observed these rectangles of light for about 3 seconds and his wife saw them for about seconds. He never supported the interpretation as a spaceship that has often been attributed to him.