DJP691 said:
So, where are these craft at now?
Pioneer 10's last communication with Earth was on January 23, 2003. It is the first man-made object to leave the solar system. Its last known position was 7.5 billion miles from Earth, moving towards the red giant Aldebaran in Taurus at about 2.6 AUs per year. If Aldebaran had no relative velocity, Pioneer 10 would reach the star in about 2 million years.
Pioneer 11's last signal was received in November 1995. It was 4.1 billion miles from Earth, traveling towards the constellation Aquila at 2.4 AUs per year. It will pass near one of the stars in Aquila in about 4 million years.
Voyager 1 is currently further from the Sun than any known natural solar-system object, including Pioneer 10. As of March 2007, it is 102 AU, or 9.5 billion miles, from Earth, traveling at 3.6 AUs per year. It is not currently traveling towards any astronomical point, but in 40,000 years, Voyager 1 will be within 1.7 light years of the star AC+793888 in the constellation Camelopardis.
Voyager 2 is currently 7.7 billion miles from Earth, traveling at 3.3 AUs per year. Like its sister probe, Voyager 2 is not traveling towards any particular star.
Both Voyagers are expected to have enough power to run their science instruments into the 2020s. They are currently being used to study the outer solar system, and Voyager 1 is expected to enter the heliopause in 2015, well before its instruments will power down.