Random triples
| Subject | Object |
|---|---|
| gptkb:100-inch_Hooker_Telescope | evidence for galaxies outside the Milky Way |
| gptkb:100-inch_Hooker_Telescope | Cepheid variable stars in Andromeda |
| gptkb:100-inch_Hooker_Telescope | gptkb:Hubble's_Law |
| gptkb:100-inch_Hooker_Telescope | distance to Andromeda Galaxy |
| gptkb:100-inch_Hooker_Telescope | classification of galaxies |
| gptkb:100-inch_Hooker_Telescope | expansion of the universe |