Astro objects

[alecras2345]

Hi im a member of the slooh website and they have various quests members complete where you learn about things.   im doing a quest about nebulae and im struggling.  What does this mean please? What Are Emission Nebulae?
Emission Nebulae are huge clouds of ionized gas that emit their own light. It does this in the same way that a neon sign glows. The nebula's gas cloud is energized by hot, young stars emitting high-energy ultraviolet light that is invisible to your eyes.  You'll read about this phenomenon when you learn about Planetary Nebulae in a later step. They also glow because their gas clouds are excited, but in their case, by the energy from their central white dwarf star in the last stages of its life.

 

I can understand this brief explanation better,

• Introduction

  Emission nebulae can range from 100 to 10,000 solar masses and can span 1 to 100 light-years in size. More specifically, an emission nebula is a cloud of hydrogen gas that is excited, or ionized. Hot nearby stars (>25,000K so O or B type stars) produce high energy ultraviolet radiation.   Heres an image  

Edited August 6, 2022 by alecras2345