Nebulae are vast clouds of interstellar gas and dust, often illuminated by nearby stars or containing young stars forming within them.
Here are some examples:
* Diffuse Nebulae: Large, irregularly shaped clouds of gas and dust, such as the Orion Nebula.
* Planetary Nebulae: Spherical or elliptical clouds of gas ejected by dying stars, such as the Ring Nebula.
* Dark Nebulae: Clouds of dust that block light from behind, such as the Horsehead Nebula.
Let me know if you'd like more details on any of these types of nebulae!
