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- K-type main-sequence starStellar classification
- K2-18bSub-Neptune orbiting the red dwarf K2-18
- Kaidun meteoriteMeteorite found in Yemen
- Kanehekili FluctusLava flow on Io
- Kardashev scaleMeasure of a civilization's evolution
- Kazimieras ČernisLithuanian astronomer and astrophysicist
- Kelvin–Helmholtz mechanismProcess of energy release of a contracting star or planet
- Kennedy Space Center Launch Complex 39AHistoric launch pad operated by NASA and SpaceX
- Kennedy Space Center Launch Complex 39BHistoric launch pad operated by NASA since 1969
- Kenneth FranklinAmerican astronomer, educator (1923–2007)
- Kenneth J. LawrenceKenneth J. Lawrence (born 1964) is an American astronomer and a discoverer of minor planet
- Kenneth KellermannKenneth Irwin Kellermann (born July 1, 1937) is an American astronomer at the National Rad
- Kent CullersAmerican astronomer (1949–2021)
- Kent Ford (astronomer)American astronomer (1931–2023)
- Kepler Input CatalogThe Kepler Input Catalog (or KIC) is a publicly searchable database of roughly 13.2 millio
- Kepler object of interestStar observed by the Kepler space telescope that is suspected to have a transiting planet
- Kepler orbitCelestial orbit whose trajectory is a conic section in the orbital plane
- Kepler-186fTerrestrial exoplanet orbiting Kepler-186
- Kepler-22bSuper-Earth exoplanet orbiting Kepler-22
- Kepler-37Kepler-37, also known as UGA-1785, is a G-type main-sequence star located in the constella
- Kepler-442Kepler-442 is a K-type main-sequence star approximately 1,196 light years from Earth in th
- Kepler-442bSuper-Earth orbiting Kepler-442
- Kepler-452bSuper-Earth exoplanet orbiting Kepler-452
- Kepler's equationOrbital mechanics term
- Kepler's laws of planetary motionLaws describing planetary orbits
- Kepler's SupernovaSupernova visible from Earth in the 17th century
- Kerberos (moon)Small natural satellite of Pluto
- Kies (crater)Kies is the remnant of a lunar impact crater that has been flooded by basaltic lava, leavi
- KilonovaAftermath of a neutron star merger
- Kin EndateJapanese amateur astronomer
- Kirkwood gapProperty of asteroid orbits
- Kitt Peak National ObservatoryUnited States astronomical observatory
- KL-7The TSEC/KL-7, also known as Adonis was an off-line non-reciprocal rotor encryption machin
- Klaas de Boer (astronomer)Dutch astronomer (1941 – 2022)
- Klim ChuryumovUkrainian astronomer and children's poet
- Konstantin BatyginAmerican astronomer and planetary scientist (born 1986)
- Kopff (crater)Kopff is a lunar impact crater that lies along the eastern edge of the inner Mare Oriental
- Korado KorlevićCroatian teacher and prolific amateur astronomer
- Koronis familyAsteroid family
- Kraken MareLargest hydrocarbon lake on Titan
- KREEPGeochemical component of some lunar rocks, potassium, lanthanides, and phosphorus
- Kreutz sungrazerFamily of comets
- Kuiper beltArea of the Solar System beyond the planets, comprising small bodies
- Kuiper quadrangleQuadrangle on Mercury