Random triples
| Subject | Object |
|---|---|
| gptkb:Pioneer_missions | first spacecraft to cross the asteroid belt |
| gptkb:NASA_Pioneer_program | first spacecraft to travel through the asteroid belt |
| gptkb:NASA_Pioneer_program | first spacecraft to make a flyby of Jupiter |
| gptkb:Pioneer_missions | launched 1972 |
| gptkb:Pioneer_missions | first spacecraft to leave the solar system |
| gptkb:Pioneer_missions | first spacecraft to make direct observations of Jupiter |