Cool and yucky astronomy photos w/ brief explanations

Cool:
The Bubble Nebula
The Boomerang Nebula in Polarized Light
Comet Hale-Bopp Over Val Parola Pass
A Lenticular Cloud Over Hawai'i
The Busy Center of the Lagoon Nebula
M2-9: Wings of a Butterfly Nebula
White Dwarf Star Spiral
M51: Cosmic Whirlpool

Yucky:
Saturn's Hyperion: A Moon with Odd Craters