| Term | Definition | Contributor | Modified |
|---|---|---|---|
| K stars | An orange-red star of spectral type K with a surface temperature of about 3600-5000 K. The spectra of K stars are dominated by the H and K lines of calcium and lines of neutral iron and titanium, with molecular bands due to cyanogen (CN) and titanium dioxide (TiO). Examples are Arcturus and Aldebaran. | Ryan McGranaghan | 2023.04.16 |
| K subdwarf stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| K subdwarf stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| K subgiant stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| K subgiant stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| K subgiant stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| K supergiant stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| K supergiant stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| K supergiant stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| K supergiant stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ktenasite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Kuannersuite (Ce) | No definition provided | Ryan McGranaghan | 2023.04.16 |
| ku band | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Kudriavite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Kudurru inscriptions | No definition provided | Christopher Rauch | 2023.12.01 |
| Kufic coins | No definition provided | Christopher Rauch | 2023.12.01 |
| Kuhland cattle | No definition provided | Christopher Rauch | 2023.12.01 |
| Kuiper belt | A region of the Solar System extending roughly from the orbit of Neptune, or 30 astronomical units (AU), to 50 AU from the Sun that contains many small icy bodies. The Kuiper belt is now considered to be the source of the short-period comets. | Ryan McGranaghan | 2023.04.16 |
| Kuiper belt objects | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Kukharenkoite (Ce) | No definition provided | Ryan McGranaghan | 2023.04.16 |