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Three non-collinear points always define exactly one and only one plane. That's why a 3-legged table or chair never wobbles.
Plane. (That's why a 3-legged stool never wobbles.)
No, collinear refers to two different points that exist on a single line. Parallel means that 2 lines exist on the same plane, and will never intersect, no matter how far they are extended.
It contains the whole line.
The moon.