an infinite number; no limit
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No, planes intersect at a line.
Nothing HAPPENS! They can intersect in a point or a line.
No, they intersect at a line.
In 3d space, two planes will always intersect at a line...unless of course they are the same plane (they coincide). Because planes are infinite in both directions, there is no end point (as in a ray or segment). So, your answer is neither, planes intersect at a line.
The intersection of two planes is a line. (or a massive explosion...lol)