The Helix Nebula is an example of a planetary nebula. Though it looks like a bubble or eye from Earth's point of view, the Helix is actually a trillion-mile-long tunnel of glowing gases. In its center ...
Eleven years ago, a close friend gave me a news tip. It was a story about a butterfly release in memory of infants who had died. Mothers of those children would gather to share their loss; a butterfly ...