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An exoplanet is a planet that does not go around our Sun. It goes around another star, outside our solar system. Scientists find these planets by watching stars carefully; nobody has visited one. The word is modern and scientific. In easy talk, people may just say “a planet around another star.” Though actually, the exo- piece means “outside” — outside our solar system — not a planet sitting at the far edge of our own system. Neptune is far away, but it is still one of ours.
系外行星（繞著別顆恆星轉、不在太陽系裡的行星）
組成Built from Ancient Greek exo- (“outside”) + planet.
同家族的字
- planetthe second half of the word
- exoskeletonalso uses exo- for “outside”
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。
exoplanetnoun/ˈɛksoʊˌplænət/
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astronomynatural-sciencesplanetologyA planet which exists outside Earth's solar system.
- More such announcements will likely come in the months to follow, as the first space observatory dedicated to hunting exoplanets, called COROT, begins full operation and researchers complete their calculations.
- In the past two years, NASA’s Kepler Space Telescope has located nearly 3,000 exoplanet candidates ranging from sub-Earth-sized minions to gas giants that dwarf our own Jupiter. Their densities range from that of styrofoam to iron.
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。