Dawn Begins Year-Long Vesta Fiesta
18 July 2011
On July 15th, our Dawn spacecraft defined "Arriva!" in a new way when it went into orbit around Vesta - an enormous asteroid with an average diameter of about 330 miles. Read Column
About: Dr. James Green
Dr. Green is the Director of Planetary Science at NASA Headquarters. He views his job as the keeper of NASA's planetary program and the top advocate for that program to flourish and grow.
