Illustration Showing a Pioneer Spacecraft in Flight

Graphic Illustration Showing a Pioneer Spacecraft in Flight

An artist's view of a Pioneer spacecraft heading into interstellar space.  Pioneer's last, very weak signal was received on January 22, 2003. At the time, it was 7.6 billion miles away from Earth. Traveling at the speed of light, the signal took 11 hours to reach Earth.

  • Copyright/Owner: NASA
  • Source: NASA
  • Public Domain