Random triples
| Subject | Object |
|---|---|
| gptkb:Near-Earth_Objects_(NEOs) | rare but significant |
| gptkb:Near-Earth_Asteroids | once every few hundred thousand years |
| gptkb:asteroid_101955_Bennu | once every 1,000 years |
| gptkb:Comet_Shoemaker-Levy_9 | increased awareness of potential threats |
| gptkb:Shoemaker-Levy_9 | comets impact Jupiter regularly |
| gptkb:Near-Earth_Objects | once every 100,000 years |
| gptkb:Potentially_Hazardous_Asteroids_(PHAs) | estimated to impact Earth every 100,000 years. |
| gptkb:C-type_asteroids | low impact frequency on Earth |