NASA has published fascinating images of auroras from space. The images show the natural spectacle from a unique perspective.

"There are times when I've seen it and I'm thinking, 'Why is the hair standing up on the back of my neck right now?'" — Tom ...

Is Earth really exceptional?  A new book seems to reaffirm that notion.  But given the right conditions, primitive life may be a mere byproduct of biophysics.