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光年是什么單位

來(lái)源:鮮淘網(wǎng) 2021-08-03 16:00:46      鮮淘網(wǎng)菲菲 手機(jī)版

　　光年是長(zhǎng)度單位，它是光在宇宙真空內(nèi)沿著直線前行一年的距離，宇宙中每個(gè)天體間的距離可達(dá)到千億千米，所以要使用這樣龐大的單位計(jì)算它們之間的距離。長(zhǎng)度單位是丈量空間距離的單位，國(guó)際規(guī)范長(zhǎng)度單位為米，但在我國(guó)還有丈、里、寸等傳統(tǒng)長(zhǎng)度單位。

　　光年是什么

光年是什么單位

　　光年是長(zhǎng)度單位

　　很多人在第一次聽到光年這個(gè)單位的時(shí)候，可能都會(huì)以為光年是一個(gè)時(shí)間單位，但實(shí)際上光年是一個(gè)用來(lái)表示距離的單位，它的具體意思是：光在宇宙真空內(nèi)沿著直線前行一年的距離。

　　為什么使用光年

　　我們?nèi)粘Ｉ钪惺褂玫拈L(zhǎng)度單位多半是厘米、分米、米、千米等等，因?yàn)槿祟惖幕顒?dòng)范圍是有限的。光年這個(gè)長(zhǎng)度單位的出現(xiàn)、使用，是因?yàn)橛钪鏄O為廣闊，每一個(gè)天體之間的距離可達(dá)到千億千米，所以人們選擇用光年來(lái)計(jì)算天體之間的距離。

　　長(zhǎng)度單位介紹

　　長(zhǎng)度單位通常是指那些用來(lái)用來(lái)丈量空間距離的單位，它們?yōu)橐?guī)范長(zhǎng)度而制定，在各個(gè)領(lǐng)域都有極為重要的作用。國(guó)際上規(guī)范的長(zhǎng)度單位是米，而在我國(guó)還有丈、里、寸、尺等傳統(tǒng)的長(zhǎng)度單位。

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