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ESAI
1. Astronomi ialah cabang ilmu alam yg melibatkan pengamatan benda-benda langit serta fenomena-fenomena alam yg terjadi di luar atmosfer Bumi
2. Tidak karena bergantung pada atmosfer si planet tersebut
3. Karena Sebelum diterima oleh mata manusia di Bumi,cahaya Matahari itu harus melewati lapisan atmosfer yg di dalamnya terdapat berbagai macam atom dan molekul gas seperti nitrogen, oksigen, uap air, dan debu. Saat melewati atmosfer dan bertemu molekul-molekul gas inilah cahaya Matahari diserap dan kemudian dihamburkan ke semua arah Saat dihamburkan, cahaya berfrekuensi tinggi akan dihamburkan lebih banyak dari pada cahaya yang berada pada frekuensi rendah (Cahaya merah berada pada frekuensi rendah dan ungu pada frekuensi tinggi)
4. Karena Galaksi Bima Sakti selama ini aktif memakan galaksi lain yang ukurannya lebih kecil
5. Dark Matter adalah zat hitam yang membuat manusia bisa melihat cahaya-cahaya yang dikeluarkan oleh bintang ketika sedang melintas di dekatnya
Pilihan Ganda
1. D. Hitam Gelap
2. C. Atmosfer
3. A. Karena debu diatmosfer menghamburkan foton merah
4. C. 200-400 miliar bintang
5. C. Sagitarius
6. B. Di bagian tengah galaksi
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