12 letters · 22 points in Scrabble
noun the branch of astronomy concerned with the physical and chemical properties of celestial bodies
originEtymology tree Proto-Indo-European *h₂eHs- Proto-Indo-European *-tḗr Proto-Indo-European *h₂stḗr Proto-Hellenic *astḗr Ancient Greek ἀστήρ (astḗr) Ancient Greek ᾰ̓́στρον (ắstron)der. English astro- English physics English astrophysics From astro- + physics.
Etymology from Wiktionary, CC BY-SA 3.0