No, they intersect at a line.
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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.
Two planes do not intersect at all if the planes are parallel in three-dimensional space.
They are called skew lines. Explanation: In 3 space, parallel lines must never intersect AND must be in the same plane. If they fail to intersect and are in different planes we call them skew lines.
Infinitely many.
A line cannot intersect in space. Space is a wide open space.