Nebula planeter adalah sebuah emisi nebula yang terdiri dari cangkang gas terionisasi yang bersinar yang sedang mengembang yang dikeluarkan selama fase masa asimtotik dari beberapa jenis bintang dalam siklus akhir kehidupan bintang tersebut.[2]
Istilah Nebula planeter sebenarnya berawal dari kekeliruan yang dilakukan oleh William Herschel (1784 atau 1785) karena jika dilihat melalui teleskop, objek-objek tersebut terlihat menyerupai awan (nebula) yang mirip dengan penampakan Uranus, planet yang telah ditemukan dengan teleskop oleh Herschel. Nama yang diberikan oleh Herschel ini kemudian diadopsi oleh para astronom dan tidak pernah berubah lagi, walaupun nebula planeter sama sekali tidak ada hubungannya dengan planet di sistem tata surya.[3]
Nebula planeter sering berisikan bintang, tetapi tidak terlihat adanya planet. Objek ini merupakan fenomena yang berumur cukup pendek, yakni beberapa puluh ribu tahun, dibandingkan dengan umur bintang yang bisa beberapa miliar tahun.
Referensi
- ↑ Miszalski et al. 2011
- ↑ Frankowski & Soker 2009, hlm. 654–8
- ↑ Hubblesite.org 1997
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Pranala luar
- (Inggris) Entry in the Encyclopedia of Astrobiology, Astronomy, and Spaceflight
- (Inggris) Press release on recent observations of the Cat's Eye Nebula
- (Inggris) Planetary Nebulae Diarsipkan 2005-12-17 di Wayback Machine., SEDS Messier Pages
- (Inggris) The first detection of magnetic fields in the central stars of four planetary nebulae
- (Inggris) Planetary Nebulae—Information and amateur observations
- (Inggris) Planetary nebula on arxiv.org
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