SLUN. SOUSTAVA

17. listopadu 2008 v 14:36 | adam káčerek |  PLANETY


Mateřským objektem naší soustavy je Slunce, ve kterém je soustředěna téměř celá její hmotnost (99.866 %). Sluneční soustava vznikla před 4,6 miliardami let z rozsáhlého plynoprachového mraku. Její hranice nejsou přesně vymezeny. Obvykle jimi rozumíme okolí Slunce, ve kterém se pohybují nejvzdálenější členové Sluneční soustavy - dlouhoperiodické komety. Planety blízké Slunci (Merkur, Venuše, Země, Mars) jsou pevné, kamenné. Vzdálené planety (Jupiter, Saturn, Uran a Neptun) jsou velké a převážně plynné. Pluto se vzhledem k malé velikosti a velkému sklonu dráhy za planetu nepovažuje. Kolem Slunce obíhá 8 planet s 63 měsíci, více než 150 tisíc planetek, několik desítek miliard komet (známe cca 700) a nespočetně mnoho meteoroidů.

Vznik Sluneční soustavy:
Sluneční soustava vznikla z obrovského oblaku plynu a prachu. Díky výbuchu jiné hvězdy se oblak začal pro svou vlastní hmotnost smršťovat,uprostřed zahušťovat a roztáčet. Pozvolna dostal tvar disku. Disk se před 4,6 mld let tak zahustil,že uprostřed začala probíhat termonukleární reakce a vzniklo Slunce. Ze zbytků plynu a prachu vznikly během sta milionů let planety. V blízkosti Slunce vznikly z úlomků hornin Merkur,Venuše,Země a Mars. Ve vzdálenějších a chladnějších oblastech se začaly spojovat horniny a kusy ledu. Tak vznikly jádra velkých planet. Ty na sebe začaly nabalovat plyn. To je případ Jupitera (největší),Saturna,Uranu a Neptuna. Pluto je nejspíš jen velká dvojplanetka.

Budoucnost Sluneční soustavy:
Sluneční soustava je odsouzena k zániku. Za méně než 5 mld let se vodík v jádře Slunce,který je potřebný k termonukleární reakci vyčerpá. Ve Slunci se začnou projevovat nové procesy,Slunce se začne nadouvat a vznikne červený obr. Země se změní v obří výheň teplota na zemi bude dosahovat až 2000 stupňů celsia. Dávno před tím už zmizela voda a všechen život. Za nějakou dobu se Slunce přestane zvětšovat. Smrští se v hvězdu o velikosti Země,která bude mít obrovskou hustotu.Tato hvězda se nazývá bílý trpaslík,který pomalu vyhasne a zanechá sluneční soustavu v chladu a ve tmě

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