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Cakram galaksi

Galaksi pengukir (NGC 253) salah satu contoh galaksi cakram

Cakram galaksi merupakan salah satu komponen dari galaksi cakram, seperti galaksi spiral atau galaksi lentikular.

Cakram galaksi merupakan bidang di mana spiral, batang dan cakram dari galaksi cakram berada. Cakram galaksi cenderung memiliki gas dan debu yang lebih banyak, dan bintang yang lebih muda dibanding tonjolan galaksi ataupun halo galaksi.

Cakram galaksi umumnya terdiri dari gas, debu dan bintang. Komponen gas dan debu pada cakram galaksi sering disebut cakram gas sedangkan komponen bintang pada cakram galaksi disebut cakram bintang.

Kecepatan orbital bintang yang tidak konsisten

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Telah dicatat bahwa kecepatan orbital bintang di piringan galaksi pada kebanyakan galaksi cakram tidak konsisten dengan jumlah materi yang bercahaya yang dihitung pada galaksi tersebut. Penjelasan yang mungkin masuk akal untuk masalah ini adalah adanya materi gelap yang tidak bercahaya.

Referensi

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Cakram galaksi
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