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Tempat Kita di Alam Semesta

18/9/2014

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Picture

Bimasakti bukanlah nama untuk tata surya kita yang terdiri dari matahari dan 8 buah planet termasuk Bumi, melainkan nama galaksi dimana tata surya kita hanyalah satu dari sekian banyak tata surya yang mengitari pusatnya. 

Galaksi Bimasakti memiliki diameter sebesar 100.000 tahun cahaya dan ketebalan sekitar 1.000 tahun cahaya. Galaksi ini mengandungi 200-400 mi
lyar bintang, dimana matahari kita adalah salah satunya yang berukuran cukup kecil. Pusat Bimasakti diperkirakan berupa sebuah blackhole raksasa. 

Tata surya kita terletak 30.000 tahun cahaya dari pusat Bimasakti dan 15 tahun cahaya dari bidang datar galaksi ini. Tata surya kita mengitari pusat Bimasakti dengan kecepatan 234 kilometer per jam. Artinya, sejak tata surya kita terbentuk 4,6 milyar tahun yang lalu, tata surya ini sudah mengitari Bimasakti sebanyak 27x. Tak boleh dilupakan pula bahwa Bimasakti ini hanya satu dari sekian banyak galaksi yang tak terhitung jumlahnya di alam semesta.

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