Are we alone? In 1995 planet hunters discovered the first alien solar system around a star like our own Sun. Ken Croswell tells the fascinating story of this discovery and the people who made it, then explores the possibility that one day we may have the technology to travel to different solar systems and find life.
Levison , H. F. , and M. J. Duncan . 1994. The long - term dynamical behavior of short period comets . Icarus 108 ( 1 ) : 18-36 . Levison , H. E , and M. J. Duncan . 2013. SWIFT : A solar system integration software package .
An unprecedented number of planets outside of the solar system have been found, with an explosion in the number of discoveries in recent years.
Two decades ago astronomers confirmed the existence of planets orbiting stars other than our Sun.