- 1小行星（不是流星，也不是彗星）
An asteroid is a rocky body that goes around the Sun. Most of them travel in a wide belt between Mars and Jupiter. books often call them “small planets,” and you will still hear that, because through a telescope they look like tiny wandering lights. Though actually, now keep planet for the big round worlds (Earth, Jupiter, and so on). Asteroids are leftover rock from when the solar system formed — some no bigger than a house, a few hundreds of across. They are not stars, and they are not the same as a meteor (the bright streak when a bit of rock burns in our air) or a comet (an icy body with a tail). If a piece survives and hits the ground, that piece is a . News and films often stretch asteroid toward “the rock that might hit Earth,” which is only one kind: a near-Earth asteroid. The everyday scientific name is still asteroid.
組成Named in 1802 by the astronomer William Herschel, after the scholar Charles Burney Jr. suggested it. From Greek ἀστεροειδής “star-like”: ἀστήρ (star) + -ειδής (like, having the form of). In English you can still see the pieces: aster + -oid (“-like”). They were called that because they showed as points of light, like stars, not as little discs the way planets do.
同家族的字
- asterisksame Greek “star” piece — the * mark is a “little star”
- astera daisy-like flower named for its star shape, same Greek piece
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，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。
asteroidnoun詞源 1/ˈæst(ə)ɹɔɪd/
- 1
astronomynatural-sciencesA naturally occurring solid object, which is smaller than a planet and a dwarf planet, larger than a meteoroid and not a comet, that orbits a star and often has an irregular shape.
- 2
astronomynatural-sciencesIn the Solar System, such a body that orbits within the orbit of Jupiter.
- The orbital planes of asteroids, minor bodies that circle the Sun mainly between the orbits of Mars and Jupiter, are often more tilted ...
asteroidnoun詞源 2/ˈæst(ə)ɹɔɪd/
- 1
biologynatural-scienceszoologyAny member of the taxonomic class Asteroidea; a starfish.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。