May 26 1993
From The Space Library
NASA announced that almost 15 years after they were launched, the Voyager 1 and 2 spacecraft had discovered the first direct evidence of the heliopause, the boundary that separates Earth's solar system from interstellar space.
Since August 1992, radio antennas on the spacecraft had been recording intense low-frequency radio emissions coming from beyond the solar system. Scientists concluded that the radio waves had been produced by electrically charged gases, or plasma, from the Sun interacting with cold gases from inter-stellar space at the edge of the solar system, a boundary known as the heliopause. A member of the Voyager science team said, "Our assumption that it is the heliopause is based on the fact that there is no other known structure out there that could be causing these signals." (NASA Release 93-099; USA Today, May 27/93; NY Times, May 27/93, May 30/93; W Times, May 27, 1997; AP, May 27/97; UPI, May 26/97; RTW, May 26/97; W Post, May 31/93; B Sun, June 8/93)
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