Why earth revolved around the sun?

original yearly rotation of earth around sun (orbital rotation), daily rotation of earth it’s own axis (just “rotation”) dumb luck.

if hold out object , toss in air, you’ll find it’s impossible toss in such way doesn’t turn @ all. same true of stellar nebulae (the gigantic clouds of gas , dust condense form stars , planets). have @ least little bit of swirl , spin.

cloud became our solar system collapsed inward, mass settled spinning disc big bump in middle (the sun), , disk began collapsing more form planets. process called accretion, , can see @ work on , on again.


when stuff collapses tends form central ball , disk.

there aren’t non-spinning planets, speed spin varies widely. jupiter’s day 10 hours long, while venus’ around 240 earth days long. how fast , in direction planet end spinning fiendishly complicated problem. of determined flow of gas , dust of “proto-planetary disk” (which simple), why orbits , rotations of every planet in solar system orbits , rotates in same direction.


since earth orbits sun in same direction rotates, when it's morning (6 am) you're standing on "front side" of earth.

once ball gets rolling (so speak) find solar system full of big rocks on different orbits slamming each other, , changing each others rotations. example, earth’s moon (most likely) created stupendous collision mars-sized “splashed” moon orbit. impact, tidal effects moon itself, have radically changed length of day on earth. uranus believed victim of bigger collision tilted it’s rotation axis around 98° it’s orbital axis (the direction perpendicular orbit), , dramatically changed length of it’s day. can’t how much; no 1 saw before.

so, in general, things spin because collapse large clouds of stuff spinning (just little) already. if cloud hadn’t been spinning, of mass in solar system have fallen way sun. instead, mere 99.86% of solar system’s mass in sun.

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