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Pioneer 11 was launched by NASA on April 6, 1973 to tour the outer part of our solar system including Jupiter and Saturn. It carried the plaque below as a welcome to other civilizations. A wealth of data was sent back to NASA by Pioneer 11 and the last NASA heard from Pioneer 11 was on November 30, 1995



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According to one of NASA's final message about Pioneer 11:

"After nearly 22 years of exploration out to the farthest
reaches of the Solar System, one of the most durable and
productive space missions in history will come to a close.

Now beyond the orbit of Pluto and more than four billion
miles from Earth, NASA's unmanned Pioneer 11 spacecraft is
heading out into interstellar space. Because the spacecraft's
power is too low to operate its instruments and transmit data,
on September 30 NASA will cease daily communications with the
spacecraft. At that distance, faint signals from Pioneer 11
traveling at the speed of light take over six hours to reach Earth.

The spacecraft will continue speeding out into interstellar
space toward the center of the Milky Way, taking an engraved
gold plaque bearing a message about Earth to other
civilizations which it may encounter. Pioneer 11 will pass
near the star Lambda Aquila in almost four million years.

"Americans should remember Pioneer 11 as a great
achievement," said NASA Administrator Daniel Goldin. "This is
the little spacecraft that could, a venerable explorer that has
taught us a great deal about the Solar System and, in the end,
about our own innate drive to learn. Pioneer 11 is what NASA
is all about — exploration beyond the frontier."