Ring of fire

I'm in Hawaii right now, and it's been blowing my mind at every turn. Today's adventure: a hike around an active volcano, Kilauea. We came to the caldera's edge just after sunset and waited for the sky to get dark. As the light faded, the glow from the lake of lava inside the crater got brighter and brighter. Until it looked like this (click for monstrously large version) :

Then over to the Observatories at Mauna Kea, the world's largest astronomical observatory. The combined light-gathering power of the telescopes on the volcano summit is sixty times greater than that of the Hubble Space Telescope. The Keck Telescope and twelve others are at the top, but we went up halfway to the visitor center, where volunteers with telescopes let us use them to gawk at distant astronomical objects. I saw the Ring Nebula, 2,300 light years away. There were more stars in the sky than I had ever seen. The Milky Way was a carpet of tiny lights. "Beautiful" doesn't quite capture it.

Mind = blown.