Emission nebula
Ultraviolet radiation from hot stars can ionize surrounding gas, which then radiates at characteristic wavelengths. This topic is part of Astronomy within Science & Nature. This page currently draws on 5 supporting questions, with answers and bonus facts available below.
Emission nebula trivia questions
Why does an emission nebula glow?
Answer: Gas is energized and emits its own light
Bonus fact: Ultraviolet radiation from hot stars can ionize surrounding gas, which then radiates at characteristic wavelengths.
Which element often gives emission nebulae their strong reddish color?
Answer: Hydrogen
Bonus fact: Ionized hydrogen commonly produces bright H-alpha emission in star-forming regions.
The Orion Nebula is a famous example of what kind of object?
Answer: An emission nebula and stellar nursery
Bonus fact: New stars are forming inside the Orion Nebula from dense clouds of gas and dust.
A reflection nebula shines mainly because it does what?
Answer: Reflects light from nearby stars
Bonus fact: Unlike an emission nebula, its gas is not ionized strongly enough to dominate the visible light.
The Horsehead Nebula is a famous example of what kind of nebula?
Answer: Dark nebula
Bonus fact: Its recognizable shape is seen against the glowing red emission nebula IC 434.