“Did You Know?”
Astronauts are considered to only be professionals who have been trained by a manned spaceflight program to command, fly as a pilot, or serve as a crew member of a manned spacecraft.
Although many non-professional space travelers have been called astronauts after crossing the Karman Line at 100km high this is strictly not true.
There have been 568 Professional Astronauts to date: http://en.wikipedia.org/wiki/List_of_astronauts_by_name
For a list of all space travelers to date: http://en.wikipedia.org/wiki/List_of_space_travelers_by_name