light year

IPA/ˈlaɪt jɪə(r)/
IPA/ˈlaɪt jɪr/

light year — 名詞

1. a unit used by astronomers for measuring the enormous gaps between stars and gal

1.名詞B2
釋義

光年

光在真空一年行進的距離，天文單位

a unit used by astronomers for measuring the enormous gaps between stars and galaxies, defined by how far light moves in a single Earth year — roughly 9.5 trillion kilometres

例句

Bao learned the Andromeda Galaxy is 2.5 million light years from Earth.

Bao 學到仙女座星系距離地球約兩百五十萬光年。

light years from [celestial body] — distance to a nearby galaxy

Astronomers use the light year to describe distances that are too large for kilometres.

天文學家用光年來描述大得無法用公里表示的距離。

常見搭配
  • light years away
  • [number] light years from [place]
  • millions/billions of light years
  • within [number] light years
同義詞
  • parsec

    a professional astronomy unit equal to about 3.26 light years; less common in everyday science news

文法句型

[number] light years from [place]

[number] light years away

用法筆記

This sense refers to distance, not time — a light year is a unit of length like a kilometre, not a period like a year. Frequently used with a number followed by from or away (e.g., 4.2 light years from Earth).

常見錯誤

The movie felt like a light year long.
The movie felt like it would never end.
A light year measures distance; use 'forever' for a long period of time.
The star is one light year from Earth.
The closest star is about 4.2 light years from Earth.
No known star is exactly one light year from us; Proxima Centauri is about 4.2 light years away.

同根字

  • light-year
    名詞B2
  • light-second
    名詞C1
  • light-minute
    名詞C1
  • light-hour
    名詞C1

常見搭配

名詞搭配

常用片語

  • [number] light years away
  • [number] light years from [place]
  • millions of light years
  • billions of light years

介系詞搭配