Exploring the Voyager Probes: Humanity's Farthest Messengers

A deep dive sparked by a post about Voyager 1 soon reaching 1 light-day from Earth. Here are the key questions & answers:

1. Has Voyager 1 fully entered interstellar space?
   Yes—crossed the heliopause in 2012. Now >170 AU away, exploring the true interstellar medium.
2. Did it detect all expected boundary signatures?
   It saw the drop in solar particles & spike in cosmic rays, but the magnetic field barely shifted direction—a big surprise! The environment is mostly stable but shows subtle changes over time.
3. Is Voyager 1 solar-powered?
   No—never was. Both Voyagers use plutonium-238 RTGs. Power now ~230 watts; NASA is turning off instruments to stretch operations into the late 2020s/early 2030s.
4. What about Voyager 2?
   Twin probe, visited Jupiter, Saturn, Uranus & Neptune (only spacecraft to do so). Entered interstellar space in 2018, now ~142 AU away. Still sending priceless data.
5. Future probes with longer-lasting power?
   Yes! NASA & ESA are developing americium-241 systems (432-year half-life vs Pu-238’s 88 years). Perfect for century-long missions. Top candidate: the proposed Interstellar Probe (2030s launch) aiming for 1,000 AU.

The Voyagers remain our only eyes in interstellar space—carrying Golden Records as humanity’s greeting to the cosmos. Nearly 50 years on, still going strong. Image: NASA artist's concept of Voyager in interstellar space
https://d2pn8kiwq2w21t.cloudfront.net/original_images/jpegPIA26353.jpg

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