PIONEER 10 & 11

Similar to Voyager, these had a few distinctive features

1 Plasma analyser

Unlike most of the instruments, which look forwards, this one looks back towards the Sun to study the solar wind.

2 Geiger tube telescope

This measures the distribution of highenergy electrons and protons as the spacecraft passes through a planetary radiation belt.

3 Meteoroid detector panels

These 12 panels are mounted on the back of the main communications dish to monitor impacts of micrometeoroids.

4 Asteroid and meteoroid detector

Four small telescopes look out for potential hazards in the form of meteoroids or small asteroids.

5 RTGs

As with Voyager, the Pioneers are powered by radioisotope thermoelectric generators, this time four of them on two separate booms.