
© NASA/JPLThe Voyager probes are both outside the heliosphere, a protective bubble created by the Sun that extends beyond the orbit of Pluto
Call it a cosmic coincidence: Two probes launched four decades apart, traveled in opposite directions - and used similar instruments to gather milestone data within hours of each other.
That scientific poetry took place on Nov. 5. Without orchestrated calculations or trajectory maneuvers,
the grizzled Voyager 2 probe crossed into interstellar space the same day that the freshly launched Parker Solar Probe made its first close approach to our sun. Both spacecraft were equipped with unique Faraday cup instruments, which they used to gather milestone data about nearby
highly charged plasma particles streaming off the sun.
"To be crossing into new territory on both edges of the heliosphere at the same time to within a day - you couldn't plan that if you wanted to," Justin Kasper, an astrophysicist at the University of Michigan and principal investigator for the Solar Wind Electrons Alphas and Protons, or
SWEAP, instrument on the
Parker Solar Probe, told Space.com here during the annual meeting of the American Geophysical Union, where both missions' accomplishments were conversation starters.
As a human, Kasper loved the coincidence, although as an astrophysicist he does have one small worry. "I am not going to be able to keep up with writing these papers," he said.
The differences between the two missions are staggering. They launched 41 years apart. Where
Voyager 2 has enjoyed a leisurely stroll among the outer planets
and beyond, the
Parker Solar Probe made a mad dash to the center of our solar system in just three months. It would take
nearly a quarter-million copies of the
Voyager 2 computer to equal the memory of the smartphone in the pocket of a
Parker Solar Probe engineer. When the
Voyagers launched, bell-bottoms were hip - and
they're back on the runways for
Parker's first winter in orbit.
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