Random triples
| Subject | Object |
|---|---|
| gptkb:Rømer's_observations_of_Jupiter's_moons | light travel time |
| gptkb:Classical_Cepheid | Hubble constant |
| gptkb:PARSEC | distances to stars and galaxies |
| gptkb:Atomic_Mass_Unit | mass of atoms |
| gptkb:Ohm | electrical resistance |
| gptkb:Neutral_Gas_and_Ion_Mass_Spectrometer_(NGIMS) | gas emissions |
| gptkb:Parsec | distances to astronomical objects |