Yes. A goalie can play up to but no further than the center line.
offside occurs when a player of a team crosses his opponent's blue line before the puck does
The distance between the bluelines ( commonly called the neutral zone or centre ice) is 50 feet.
It is The Columbus Blue Jackets they have been in the NHL for 10 years
, To answer your question, a Hockey "Offside" is when the player crosses the offensive blue line before the puck. There is a move called "Dragging the line" that NHL players, or in general any hockey player (Like myself) use. What they do is keep a skate ON the blue line when the puck is crossing the line and you are ahead of the play and/or puck.
A NHL hockey player!!
Columbus Blue Jackets
It the point is on the line the distance is 0. If the point is not on the line, then it is possible to draw a unique line from the point to the line which is perpendicular to the line. The distance from the point to the line is the distance along this perpendicular to the line.
the blue line the blue line