Random triples
| Subject | Object |
|---|---|
| gptkb:Shapley–Curtis_Debate | spiral nebulae are separate galaxies |
| gptkb:Shapley–Curtis_Debate_(1920) | spiral nebulae are separate galaxies |
| Subject | Object |
|---|---|
| gptkb:Shapley–Curtis_Debate | spiral nebulae are separate galaxies |
| gptkb:Shapley–Curtis_Debate_(1920) | spiral nebulae are separate galaxies |