Original sentence: Cosmology, from the Greek: κοσμολογία (κόσμος world + λογια discourse) is the study of the universe in its totality and by extension man's place in it
Edited sentence: Cosmology, from the Greek: κοσμολογία (κόσμος world + λογια discourse) is a speculative science which studies the universe in its totality and by extension man's place in it