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Mengapa Bintang Bercahaya?

31 October by Super User
( 0 Votes ) 
Mengapa Bintang Bercahaya?

Ada terdapat berjuta-juta bintang di angkasa. Bintang terbuat dari bola-bola gas bersuhu tinggi yang bercahaya, oleh karena itu bintang bersinar atau bercahaya karena sinarnya sendiri. Berbeda denga bulan yang mendapatkan cahaya karena pantulan dari sinar matahari. Bintang juga terkadang tampak berkelap-kelip. Hal tersebut disebabkan adanya udara yang membengkokkan sinar bintang, sehingga kelihatan kelap-kelip.

Para astronom berpendapat bahwa alam semesta ini mempunyai banyak gugusan bintang atau sering disebut dengan galaksi. Galaksi merupakan kumpulan bintang, planet, dan awan gas (nebula). Bintang yang sudah tua biasanya mati dan kemudian meledak. Ledakan  itu dapat menyebabkan awan gas di galaksi yang tenang menjadi bergerak cepat berputar-putar seperti cakram dan menjadi terpusat ditengah cakram. Gas tersebut berkumpul menjadi gumpalan gas raksasa. Didalam gumpalan gas raksasa, gas terus bergerak dan bertabrakan dan tekanan serta  suhu gas menjadi amat panas sehingga mengeluarkan energi yang tinggi berupa cahaya. Saat gumpalan gas menjadi bercahaya inilah, para astronom menamainya “BINTANG”

Sumber:  Arkady Leokum, Still More Tell Me Why Chapter 1 The World we live in,Grosset & DunlapInc.,1978,h.86.

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