Solar panels are next to useless in the outer solar system, so NASA’s Voyager probes rely on nuclear batteries—technology first developed in the 1960s—to keep running billions of miles from Earth.

Powering spacecraft with solar energy may not seem like a challenge, given how intense the Sun’s light can feel on Earth. Spacecraft near the Earth use large solar panels to harness the Sun for the electricity needed to run their communications systems and science instruments.

However, the farther into space you go, the weaker the Sun’s light becomes and the less useful it is for powering systems with solar panels. Even in the inner solar system, spacecraft such as lunar or Mars rovers need alternative power sources.

  • jqubed
    4·
    9 days ago

    The solution is technology developed in the 1960s based on scientific principles discovered two centuries ago: radioisotope thermoelectric generators, or RTGs.

    Wow, a discovery from the 1700s!

    Radioisotope thermoelectric generators can turn heat into electricity using a principle called the Seebeck effect, discovered by German scientist Thomas Seebeck in 1821.

    Ugh, the 1820s is now what two centuries ago is

    • Admiral Patrick@dubvee.orgOPEnglish
      2·
      9 days ago

      Ugh, the 1820s is now what two centuries ago is

      Uh, it is?

      1 Century = 100 years

      2025 - 200 = 1825

      When referencing time by century, it’s acceptable to round a little, and I’m not complaining about rounding up 4 years.

      Are you by chance thinking of it like 18th century = 1700s where it’s one off from what you’d expect?

      • jqubed
        4·
        9 days ago

        It’s just that in my mind 200 years ago is still the 1700s, sort of like how 30 years ago is still the 1970s, not the 1990s