Chirevo cheChindeya

Peji rino rinoda kuwerengwa ne kugadziriswa
Chirevo cheChindeya sezvo izwi rakatorwa neVagiriki wekare, rakabatanidza mukati meskopu rayo pahupamhi hwemitumbi yekudenga. Maastronoma echiGiriki vakashandisa izwi rekuti asteres plantai (ἀστέρες πλανῆται), "nyeredzi dzinodzungaira", kureva zvinhu zvakaita senyeredzi izvo zvinoita kunge zvaifamba mudenga. Mukufamba kwenguva, izwi iri rakasanganisira zvinhu zvakasiyana zvakasiyana, kubva kuZuva ne Mwedzi kusvika kumasetirayiti ne maasteroidhi.

Mukuongorora nyeredzi kwemazuva ano, kune pfungwa mbiri dzekutanga dze'nyika'. Tisingatarise izvo zvinogara zvisingaenderane zvehunyanzvi ruzivo, ndezvekuti muviri wemuchadenga unodzora dunhu rawo (kureva kuti, ungave unodzora magumo emamwe mitumbi madiki ari pedyo) kana kuti iri muhydrostatic equilibrium (kureva, ingave yakatenderera) . Izvi zvinogona kuratidzwa seiyo dynamical dominance tsananguro uye geophysical tsananguro.

Nyaya yetsanangudzo yakajeka yepasi yakasvika pakakwirira muna Ndira 2005 nekuwanikwa kwechinhu chinopfuudza Neptunian chinonzi Eris, muviri wakakura kudarika puraneti diki yaigamuchirwa panguva iyoyo, Pluto. Mumhinduro yayo yaNyamavhuvhu 2006, Kubatana kwePasirose kweUpanganyeredzi  (IAU: International Astronomical Union), inocherechedzwa nevanoongorora nyeredzi sesangano repasi rose rinoona nezvekugadzirisa nyaya dzezita, rakaburitsa mutongo waro panyaya iyi pamusangano wakaitwa muPrague. Tsanangudzo iyi, inoshanda chete kuSolar System (kunyangwe maexoplanets akange ataurwa muna 2003), inotaura kuti nyika muviri unotenderera Zuva, yakakura zvakakwana kuti simba rayo riite kutenderera, uye "yakachenesa nharaunda yaro. " yezvinhu zvidiki zvinosvika pakutenderera kwayo. Pasi peiyi tsananguro yakarongeka, Pluto nezvimwe zvinhu zvetrans-Neptunian hazvikodzere semapuraneti. Sarudzo yeIAU haina kugadzirisa makakatanwa ese, uye nepo vazivi venyeredzi vazhinji vakaigamuchira, mamwe masayendisiti ezvemapuraneti akairamba zvachose, vachikurudzira tsananguro ye geophysical kana yakafanana.

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Category:Chirevo cheChindeya