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03/07/17
@ProfsAxton
"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 Tata Surya.
Tata Surya dibagi menjadi beberapa kelompok:
Planet-planet bagian dalam, asteroid, dan planet-planet bagian luar.
Planet-planet bagian dalam adalah planet-planet bersifat kebumian yaitu Merkurius, Venus, Bumi dan Mars.
Planet-planet bagian luar adalah raksasa-raksasa gas Tata Surya yaitu Yupiter, Saturnus, Uranus, dan Neptunus.
Terbentuknya planet-planet bermula pada sebuah cakram protoplanet yang mengitari Matahari pada periode-periode awalnya.
Dari cakram ini terwujudlah gumpalan-gumpalan materi melalui proses yang melibatkan tarikan gravitasi, benturan, dan akresi.
Gumpalan-gumpalan ini kemudian lama-kelamaan menjadi kumpulan protoplanet.
Karena tekanan radiasi dari angin surya terus mendorong materi-materi yang belum menggumpal, hanya planet-planet yang massanya cukup besar yang mampu mempertahankan atmosfer berbentuk gas.
Planet-planet muda ini terus menyapu dan memuntahkan materi-materi yang tersisa, menghasilkan sebuah periode penghancuran yang hebat.
By: Kirihara Nao Aleyson
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