No.
Almost never happens.
Depends on how well aligned you mean, occasionally all the planets will be within 45° (as seen from the Sun) or within a cone that has the vertex at the Sun and has an opening of 30°, this happens every decade or so.
All the planets can never align less than 2° because the deviation from the ecliptic for some of the planets is greater than this.
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it depends on how you place it, they can be. all a line segment is is a straight line, if you have two you can have parallel or crossing lines.
Yes No, lines of longitude are as parallel to each other as the earth is flat. All longitudes intersect at the north and south poles.
A horizontal line goes from left to right and looks like this. Also, all horizontal lines are parallel to each other. ______________________________________________________________________ ______________________________________________________________________
Yes, but not all of them, some of them are either parallel or perpendicular.
Its called the catastrophic alignment or planetary alignment