IPA: /ˌæstrəˈfoʊtəˌgræf/
KK: /æstrəˈfɒtəˌgræf/
A photograph of astronomical objects, such as stars, planets, and galaxies, typically taken with a telescope or specialized camera.
The astrophotograph captured the beauty of the Milky Way in stunning detail.
Astrophotograph is formed from "astro-" (from Greek "astron", meaning star) and "photograph" (from Greek "photos", meaning light, and "grapho", meaning to write or draw). The word refers to a photograph taken of celestial bodies or stars, capturing their image using light.
Think of 'stars' ('astro-') being 'captured in light' ('photograph') — that's what an astrophotograph is.