400 years after Galileo
AUG 25, 2009
DOI: 10.1063/PT.5.023628
NPR : Four centuries ago next week, Galileo publicly unveiled his first telescope. The world has been looking skyward ever since. Guy Raz talks with Robert Williams, the president of the International Astronomical Union , who once used the Hubble telescope to examine what appeared to be a blank patch of sky—and found about 3,000 galaxies.
© 2009 American Institute of Physics
