Re: 3
Not only is our orbit "flat" around the sun, but the majority of our solar system is on the same flat plane.
That's why they tend to follow the same apparent path (as observed from the Earth) and this is called the Ecliptic
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Why? It’s mainly because, long ago, before there was a solar system as we know it today, there was a vast cloud of gas and dust in space. This cloud was spinning, and, as it spun, it flattened out. Our sun formed in the center of this cloud, and the major planets and most other solar system objects formed in the flat disk surrounding the sun.
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