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OWL October 2015
@wshlds - Willow Shields - Ravenclaw - 2ndAU - Astronomy

Charm
1. C
2. C
3. C

Potion
1. C
2. D
3. D

Arith
1. C
2. C
3. A

TFG
1. B
2. D
3. D

PTIH
1. C
2. D
3. C

Herbologi
1. B
2. C
3. D

Quidditch
1. C
2. A
3. B

Perminatan
Matahari sebagai bintang

Pada dasarnya, matahari merupakan salah satu bintang yang berada di tata surya dan menjadi pusatnya. Hal itu disebabkan karena matahari menghasilkan energi cahayanya sendiri.

1. Energi Pancaran Matahari.

Matahari memancarkan energi dalam bentuk cahaya ke segala arah. Energi yang dipancarkan tersebut, hanya walau demikian, energi kecil tersebut sudah cukup sebagai sumber energi di Bumi. Jika berlebihan, bisa-bisa kita mati terbakar. Berdasarkan hasil penelitian, setiap 1 cm kuadrat atmosfer di Bumi, rata-rata menerima energi Matahari sebesar 2 kalori tiap menitnya atau 8,4 joule/menit.

Berdasarkan penelitian yang diperoleh, ternyata Matahari kita merupakan bola gas yang sangat panas. Unsur bola gas tersebut terdiri atas 70% gas hidrogen, 25% gas helium, dan 5% unsur-unsur lain seperti gas oksigen, karbon, neon, besi, nitrogen, silikon, magnesium, nikel, dan belerang (sulfur). Di matahari berlangsung suatu reaksi yang menghasilkan energi sangat besar. Reaksi yang terjadi adalah penggabungan inti-inti atom ringan (hidrogen) dan membentuk inti-inti atom berat (helium). Bernama reaksi Fusi. Reaksi fusi hanya dapat berlangsung di tempat yang bersuhu sangat tinggi, yaitu Matahari. Dalam reaksi tersebut, setiap empat buah hidrogen membentuk sebuah helium dan disertai dengan energi pembebasan energi yang cukup besar. Energi inilah yang dipancarkan matahati ke segeala arah. Dan karena sebagian besar matahari tersusun atas hidrogen, maka reaksi yang berlangsung dapat terus berulang terus-menerus tanpa perlu takut kehabisan energi.

Lapisan matahari :
1. Inti Matahari
2. Fotosfer
3. Kromosfer
     
 
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