Chubby, brunette Eunice Kinnison sat in a rocker, reading the Sunday papers and listening to the radio. Her husband Ralph lay sprawled upon the davenport, smoking a cigarette and reading the current issue of EXTRAORDINARY STORIES against an unheard background of music. Mentally, he was far from Tellus, flitting in his super-dreadnaught through parsec after parsec of vacuous space. E.E. "Doc" Smith, Triplanetary, Chapter 5: "1941"
Saturday, September 08, 2012
Passing the Edge
At what point do the Voyager probes (still ticking!) go from being "in" the Solar System" to being "in" interstellar space? Today's Astronomy Picture of the Day gives us one clue.