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Astrophysics is the science that asks what stars and other space objects are made of, and what forces shape them — gravity, heat, light, and the way matter behaves in places we cannot touch. It is astronomy with a physics brain: not only “where is that star?” but “why does it shine, and what happens when it dies?” The word belongs to universities and science news; it feels technical. Though actually, a lot of modern astronomy is astrophysics, so the two names blur, and people use them as if they were almost the same.
天文物理學（學界也常用天體物理學）
組成astro- (from Greek for star) + physics (the science of matter, energy, and forces; physics goes back to Greek for “nature”).
同家族的字
- astrophysicistthe person who does this work
- physicsthe second half: the same science, not limited to space
- astronomyshares astro-; the wider study of the sky
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
astrophysicsnoun/ˌæs.tɹoʊˈfɪz.ɪks/
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The branch of astronomy or physics that deals with the physical properties of celestial bodies and with the interaction between matter and radiation in celestial bodies and in the space between them.
- The fact is, dark energy is the biggest mystery in science. It has driven a huge amount of research in the past decade, and was a key driver in last year’s “New Worlds, New Horizons” report from the National Academies of Science, which prioritized future astronomy and astrophysics projects.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。