What are galaxy voids?
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- What is helioseismology?
- Star Formation
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- What is the Crab Nebula remnant? What is the Cigar Galaxy's star formation?
- What is a Type II supernova?
- What are novae? What is the planetary nebula NGC 7293?
- What is the color excess?
- What is the initial mass function (IMF)?
- What is the mass-luminosity relationship? What are globular star clusters?
- What is the blackbody spectrum?
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