Random triples
| Subject | Object |
|---|---|
| gptkb:M4 | Hubble Space Telescope images |
| gptkb:Shoemaker-Levy_family_of_comets | observed by Hubble Space Telescope |
| gptkb:Leo_Triplet | extensive observational data available |
| gptkb:Cygnus_X-3 | extensive observational data available |
| gptkb:M68 | Hubble Space Telescope images |
| gptkb:Messier_87 | Hubble Space Telescope, Chandra X-ray Observatory |
| gptkb:Shoemaker-Levy_family_of_comets | observed by ground-based telescopes |