astronomy
The Italian 'astronomia' translates to 'astronomy' in English. It is commonly used in similar contexts as in English, referring to the scientific study of celestial bodies such as stars, planets, comets, and galaxies.
Astronomy is the science that studies celestial bodies.
This is a simple declarative sentence stating the definition of astronomy. In Italian, 'astronomia' is used here as subject.
I bought an astronomy book.
This sentence uses 'astronomia' as an adjective to describe the type of book that was bought. In Italian, 'astronomia' comes before 'libro' similar to how 'astronomy' precedes 'book' in English.
We went to the planetarium to learn more about astronomy.
This sentence uses 'astronomia' as the object of the preposition 'sull' (about). The preposition 'sull' is a contraction of 'su' (on) and 'il' (the), and 'di più' means 'more'.