which us spacecraft eas the 1st manmade object to leave the solar system in 1972?

Answer 1

Pioneer 10
http://en.wikipedia.org/wiki/Pioneer_10
Sorry, BUT your question is incorrect.
it was BUILT and launched in 1972
It left the "solar system" on June 13, 1983.
It passed the orbit of Neptune, the outermost planet. (Although Pluto was considered to be a planet at the time, it was closer to the sun than Neptune due to its highly eccentric orbit.)
March 31, 1997 End of mission.
January 23, 2003 The last, very weak, signal from Pioneer 10 was received.

Where exactly does our solar system end? are we including all the dwarf planets and other objects beyond the Kuiper belt?

a message sent with it
http://www.aerospaceweb.org/question/spacecraft/interstellar/pioneer10-plaque.jpg

I knew Voyager fit in here somewhere, guess I actually recalled that from that old Star Trek Movie and that freakin Veger freak.

Answer 2

By some definitions, Pioneer 10 (launched in 1972) has become the first artificial object to leave the solar system. However, it still has not passed the heliopause or Oort Cloud.

Voyager 1 is the farthest human-made object from Earth, traveling away from both the Earth and the Sun at a relatively faster speed than any other probe. As of August 22, 2007, Voyager 1 was at a distance of 103.6 AU (approximately 9.7 billion miles or 0.0016 light years) from the Sun, which makes it the most distant human-made object from Earth.

Answer 3

Pioneer 10 was launched in 1972, but it did not escape the solar system until much later. It is after its encounter with Jupiter in late 1973 that the sling shot effect (gravitational boost) provided it with enough velocity to reach the 3rd cosmic speed and escape the solar system. And it has still not officially reach the Oort cloud or the heliopause yet (now, in 2007), so even if the probe has enough speed to eventually do it, it is not really out of the solar system yet.

Answer 4

Pioneer 10 was that spacecraft, and it did not cross the orbit of Pluto until 1983. Jupiter did however giver it more velocity than the rocket that launched it, more than enough for it to escape from the Solar System forever.

Answer 5

Eris, the biggest dwarf planet well-known, became chanced on in an ongoing survey at Palomar Observatory's Samuel Oschin telescope via astronomers Mike Brown (Caltech), Chad Trujillo (Gemini Observatory), and David Rabinowitz (Yale college). We formally stated the call on 6 September 2006, and it became properly-known and introduced on thirteen September 2006.