Maybe that was part of their anatomies
They did come from another galaxy, after all. At least that is what
they told the Enterprise landing party.
Some day, if not already, we are going to regret having such amazing
special effects in our entertainment. Not long ago we thrilled to seeing
and wondering how Hollywood could make things seem so real. Now it
is almost blaze (accent mark on the e).
And I really wish they had left the original ST alone.