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Planeetkern
'n Planeetkern bestaan uit die heel binneste lae van 'n planetêre liggaam.[1] Kerns kan heeltemal solied of heeltemal vloeibaar wees, of andersins 'n mengsel van die twee, soos die aardkern.[2] In die Sonnestelsel wissel kerngroottes van 20% (die Maan) tot 85% van 'n liggaam se radius (Mercurius).
Gasreuse het ook kerns, maar die samestelling is onseker. Dit kan wissel van soliede yster tot ys of vloeibare metaliese waterstof.[3][4] Hulle kerns is proporsioneel veel kleiner as dié van aardplanete, maar hulle werklike grootte kan baie groter as die Aarde s'n wees; Jupiter se kern is 10 tot 30 keer so swaar soos die Aarde self,[5] en die eksoplaneet HD149026 b se kernmassa kan 100 keer so groot soos die Aarde se massa wees.[6]
Planetêre kerns is moeilik om te bestudeer, want hulle kan nie regstreeks bereik word nie. Hulle word dus met indirekte maniere bestudeer, soos seismologie, mineraalfisika en planetêre dinamika.
- ↑ Solomon, S.C. (2007). "Hot News on Mercury's core". Science. 316 (5825): 702–3. doi:10.1126/science.1142328. PMID 17478710. S2CID 129291662.
- ↑ Williams, Jean-Pierre; Nimmo, Francis (2004). "Thermal evolution of the Martian core: Implications for an early dynamo". Geology. 32 (2): 97–100. Bibcode:2004Geo....32...97W. doi:10.1130/g19975.1. S2CID 40968487.
- ↑ Pollack, James B.; Grossman, Allen S.; Moore, Ronald; Graboske, Harold C. Jr. (1977). "A Calculation of Saturn's Gravitational Contraction History". Icarus. Academic Press, Inc. 30 (1): 111–128. Bibcode:1977Icar...30..111P. doi:10.1016/0019-1035(77)90126-9.
- ↑ Fortney, Jonathan J.; Hubbard, William B. (2003). "Phase separation in giant planets: inhomogeneous evolution of Saturn". Icarus. 164 (1): 228–243. arXiv:astro-ph/0305031. Bibcode:2003Icar..164..228F. doi:10.1016/s0019-1035(03)00130-1. S2CID 54961173.
- ↑ Stevenson, D. J. (1982). "Formation of the Giant Planets". Planet. Space Sci. Pergamon Press Ltd. 30 (8): 755–764. Bibcode:1982P&SS...30..755S. doi:10.1016/0032-0633(82)90108-8.
- ↑ Sato, Bun'ei; al., et (November 2005). "The N2K Consortium. II. A Transiting Hot Saturn around HD 149026 with a Large Dense Core". The Astrophysical Journal. 633 (1): 465–473. arXiv:astro-ph/0507009. Bibcode:2005ApJ...633..465S. doi:10.1086/449306. S2CID 119026159.
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