Marcia DunnMarcia Dunn is the aerospace writer for The Associated Press, based at NASA's Kennedy Space Center in Florida. She has covered the space beat since 1990 and written extensively about the human side of space exploration. She witnessed and covered 99 sace shuttle flights, chronicling the completion of the program in 2011, and has shifted more of her focus to astronomy and robotic missions. The New Horizons mission to Pluto has turned out to be one of her favorite all-time stories. Read More Read Less