Why Do All The Planets Orbit In The Same Plane?

There are many planetary systems like ours in the universe, with planets orbiting a host star. Our planetary system is named the "solar system" because our Sun is named Sol, after the Latin word for Sun, "Solis," and anything related to the Sun we call "solar." 
As soon as they began to observe the night sky, astronomers found that Mercury, Venus, Mars, and basically all the solar system planets, orbit in almost coplanar orbits. How was that possible?
An explanation for this was needed. 
As of today, we think the reason is the following: the orbits of the planets are coplanar because, during the Solar System's formation, the planets formed out of a disk of dust that surrounded the Sun. Because that disk of dust was a disk, all in a plane, all of the planets formed in a plane as well. 

But let's see this in more detail. 

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Credits: Nasa/Shutterstock/Storyblocks/Elon Musk/SpaceX/ESA/ESO/ Flickr

Video Chapters:
00:00 Intro
1:12 planetary formation
5:02 planetesimal
7:50 the ecliptic
8:20 Pluto orbit

#insanecuriosity #planets #orbit

[InsaneCuriosity]

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[Alex-bwyd]

Update: DART did work, and it worked so much better than scientists ever expected. It changed its orbit by like 35 minutes, and it was only expected to change it by 10-11. That’s over 3x the amount predicted. That bodes really well for us with moving large asteroids out of the way of the Earth.

[poindextertunes]

i like how they give the explanation up front instead making you suffer through till the end of the video 💯

[technics]

Thank you for giving the answer in the first minute of video, and then going into details. No unnecessary suspension.

[slehar]

Missed an important point: initially matter circulates at All Planes and orientations. If there is a stistically dominant oritation then ALL THE OTHER ORIENTATIONS ARE ELIMINATED BY COLLISIONS as they pass through the y plane. Leaving only the orbits not subject to collisions.

[wwhhaatttraahhww]

I was under the impression that our solar system behaved similarly to a projectile. Our sun being the leading object with all the plants and moons in our solar system locked into gravitational equilibrium constantly trying to fall into the suns gravitational mass, but constantly missing it due to the suns velocity.

Somewhat similar to how our space stations are perpetually falling onto the planet, but the speed maintained that’s parallel to the surface is fast enough to consistently miss the planets surface.

I literally thought this was the basic idea as to how the solar system as a whole moves through space just more complex like the precise gears in a clock.

[Xeno_Bardock]

Sun's rotating magnetic field mostly forces planets to orbit in same plane, without which the orbits of planets will be all over the place. Every planet is highly charged which causes planets to move right angles to Sun's magnetic field, creating an orbit. Gravity and centrifugal force are not the only players in the field. Also mutual repulsion between Sun and planets keeps them from readily colliding.

[salvatorefederico]

The Latin for Sun is just “Sol”, which is in the nominative case (subject case), while “Solis” is the genitive (i.e., of the Sun)

[joelhjd]

TLDW: Stars are believed to form as the result of a collapse of a low-temperature cloud of gas and dust. As the cloud collapses, conservation of angular momentum causes any small net rotation of the cloud to increase, forcing the material into a rotating disk. All of the angular momentum of that disk is retained in the star and the planets that formed from it.

[mm-dwrr]

I just love this type of Insane Curiosity! 🤩

[donaldham]

I’ve always wondered this. I also wonder why galaxies are nearly the same plane too. And how are we estimating the amount of planets in a galaxy when we can only ever see the planets that pass between us and their star? What if half of them have planets that orbit north to south in relation to the direction were observing them from?

[artzavala]

For the same reason that rings on a planet rotate on the same plane (gravitational forces). When you rotate something from a rope, for instance, it always moves to the same plane perpendicular to it's axis of rotation no matter in what other plane it starts rotating. Ignore effects due to atmospheric conditions.

[priztucker]

I like that he gave the answer at the beginning then took the rest of the video to explain.

[anthonyperry]

It amazes me that 95% of all stars observed have companion stars but our sun doesn't, that we know of yet.

[cosmojuicer]

At the risk of sounding like a smarty pants or a dummy, the washing machine is a bad example. Explain why: The clothes are enclosed and therefore restricted in a disk shaped enclosure.

[EmilyTienne]

I bet there is someone out there who could supply the answer succinctly in about one minute.

[OnoSata]

I mostly understood the first 60 seconds
Thank you...

[GMPranav]

Even the word "planet" seems like it's derived from the word "plane" lol

[roybaker]

Job 26:7 He spreads out the northern skies over empty space;
he suspends the earth over nothing.

Psalm 19:1-4. Is one of my favorites.

[anthonycarbone]

If the material in the disc was uniform and all the same, why do the planets each have different chemical composition especially from the sun which contained the majority of the matter?