Here is the Morris-Thorne Wormhole line element: ds2 = - c2dt2 + dl2 + (b2 + l2)(dθ2 + sin2(θ)d∅2) Now my main question here (even though I've asked this before, but never quite understood) is: What exactly is l? I know that b is the radius of the throat of the wormhole. I know that the rest of the terms in this line element besides l itself are just the usual terms that appear in a line element that has a spherical basis. I just don't know what l is. From what I've gathered, l can range from - ∞ to ∞. Two different signs for l represent two different universes.. Apparently, large l absolute values represent flat Minkowski space-times. Finally, I've read that increasing l corresponds to either increasing or decreasing energy density,or something to that nature. Those are some properties about certain values of l, but I still don't know what l itself is. I don't know what l = 1 or l = 5 or any other random l value would mean. Please help me on this. On another note, based on the fact that the line element has a spherical basis that this wormhole is spherically symmetric. I can also tell that it is static since no functions of time are involved in the line element. Would this description of the wormhole be correct? I think it would really help me understand this wormhole if I could get a visual in my mind of what the wormhole looks like.