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Ilmu ini secara pokok mempelajari berbagai sisi dr benda2 langit, seperti
• Asal-usul
• Sifat fisika/kimia
• Meteorologi
• Gerak
Kata astronomi berasal dari bahasa Yunani, yaitu kata astron (ἄστρον, “bintang” yang kemudian diberi akhiran -nomi dari nomos (νόμος, “hukum” atau “budaya”. Maka secara harafiah ia bermakna “hukum/budaya bintang-bintang
Ada beberapa cabang-cabang spesifik dalam astronomi, antara lain:
1. Astronomi surya Cabang ini membahas tentang matahari baik komposisi, sifat fisis, dan lain-lain.
2. Ilmu keplanetan Cabang astronomi ini meneliti susunan planet, bulan, planet katai, komet, asteroid, serta benda-benda langit lain yang mengelilingi bintang, terutama Matahari, walau ilmu ini meliputi juga planet-planet luar surya.
3. Astronomi bintang Untuk memahami alam semesta, penelitian atas bintang-bintang.
4. Astronomi ekstragalaksi Penelitian benda-benda yang berada di luar galaksi kita (astronomi ekstragalaksi).
5. Kosmologi atau upaya meneliti alam semesta secara keseluruhan.
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