THE AMAZING 8-WATTS
In 1972, NASA launched the exploratory space probe Pioneer 10. According to Leon Jaroff in Time, the satellite’s primary mission was to reach Jupiter, photograph the planet and its moons, and beam data to earth about Jupiter’s magnetic field, radiation belts, and atmosphere. Scientists regarded this as a bold plan, for at that time no earth satellite had ever gone beyond Mars, and they feared the asteroid belt would destroy the satellite before it could reach its target.
But Pioneer 10 accomplished its mission and much, much more. Swinging past the giant planet in November 1973, Jupiter’s immense gravity hurled Pioneer 10 at a higher rate of speed toward the edge of the solar system. At one billion miles from the sun, Pioneer 10 passed Saturn. At some two billion miles, it hurtled past Uranus; Neptune at nearly three billion miles; Pluto at almost four billion miles. By 1997, twenty-five years after its launch, Pioneer 10 was more than six billion miles from the sun.
And despite that immense distance, Pioneer 10 continued to beam back radio signals to scientists on Earth. "Perhaps most remarkable," writes Jaroff, "those signals emanate from an 8-watt transmitter, which radiates about as much power as a bedroom night light, and takes more than nine hours to reach Earth."
The Little
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