Ekuqaleni kwawo-1900, isazi sezibalo saseMelika kanye nesazi sezinkanyezi uPercival Lowell saqhubekisela phambili inkolelo-mbono yokuthi amandla adonsela phansi omzimba ongaziwa weplanethi yiwo owabangela ukuba kube nomphumela. Ukuzamazama emizileni ye-Uranus neNeptune. Ngo-1905, waqala ukufuna leyo planethi ngosizo lwezisebenzi ze-observatory. Nakuba ashona engazange ayithole ngempumelelo, ukusesha kwaqhubeka futhi kwafinyelela umvuthwandaba ngokutholwa kwe-Pluto ngo-1929 yisazi sezinkanyezi uClyde W. Tombaugh, owasebenzisa isibonakude esingama-intshi angu-13 kanye nesiqhathanisi sokucwayiza ukuze asithole.
Emashumini ambalwa eminyaka alandelayo, uPluto - owanikezwa igama lesiRoma likankulunkulu wamaGreki wezwe elingaphansi komhlaba - wayebhekwa njengelungu leplanethi elikude kakhulu lesimiso sonozungezilanga. Njengoba iqhele ngamakhilomitha angaba ngu-6 000 000 000 ukusuka elangeni futhi izungezwe izinyanga ezinhlanu, yahlala ingaqondakali ngenxa yobukhulu bayo obuncane. Njengoba ubuchwepheshe buthuthuka, ososayensi bakwazi ukuthola ukuthi i-radius ye-Pluto ingaphansi kwengxenye ye-Mercury's nokuthi umkhathi wayo uqukethe. ikakhulukazi i-nitrogen, i-methane, i-carbon monoxide ne-hydrogen cyanide .
Nokho, ngo-August 2006, abacwaningi ku-International Astronomical Union (IAU), nokho, bavotela ukuhlukanisa kabusha i-Pluto njengeplanethi encane ngokusekelwe kusethi yamazinga amasha. Ukuze iplanethi ichazwe njengenye, kwakudingeka ibe inhlangothini yokuzungeza ilanga, kumelwe ibe yindilinga futhi isuse indawo ezungezile emzileni wayo. Nge-orbit eccentric, i-Pluto, ngeshwa, ayizange ihlangabezane nemfuneko yokugcina.
Kwakukhona nezinye izizathu zokunganiki iPluto isimo seplanethi. Eminyakeni eyishumi ngaphambili, ngo-1992, ososayensi bathola i-Kuiper Belt, indandatho emise okwe-donut engahlanganisi nje i-Pluto kuphela kodwa nezinye izinkanyezi ezinomsila, ama-asteroids nezindikimba zeqhwa ezincane ezazidlulela ngale komzila we-Neptune. Ngesikhathi sokutholakala, ososayensi baxoxisane ngokuthi banikeze ezinye zezinto ezisesimeni seplanethi yebhande - isiphakamiso esisodwa esiyimpikiswano ngabe ibhale amaplanethi ayi-12, abengafaka i-asteroid kanye nenyanga ye-Pluto i-Charon, ohlelweni lwelanga. Inkinga yayiwukuthi ukwenza kanjalo kwakuyoba, esikhathini esithile, kubangele inani elingapheli lezinto ezisazotholwa futhi eziqokwe njengamaplanethi.
Ekugcineni, izazi zezinkanyezi ezingu-424 e-IAU zivotele ukwakha izigaba ezintathu eziyinhloko ohlelweni lwelanga: amaplanethi, amaplanethi amancane kanye nezinhlaka ezincane zesistimu sonozungezilanga. Ngenxa yalokho, manje kunamaplanethi aqashelwa emhlabeni ayisishiyagalombili kuphela: iMercury, iVenus, uMhlaba, iMars, iJupiter, iSaturn, i-Uranus neNeptune. Nakuba i-Pluto yaziwa njengeplanethi encane namuhla, isakhiqiza isithakazelo esikhulu - muva nje, izazi zezinkanyezi. wabona ukwehla okukhulu komfutho womoya wePluto , elawulwa kakhulu yisitsha esimbozwe yiqhwa esibizwa ngokuthi iSputnik Planitia.
Ukuze uthole okwengeziwe, bheka isiqephu esingenhla se I-Space Down to Earth. Uma uyijabulele le ndaba, ungafuna ukuhlola izithombe ezinhle kakhulu zomhlaba ezithathwe emkhathini.
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