Two galaxies that look to be the same.
Symmetrical families is where any member of the family is just as equal to any other
An irregular galaxy. See related question.
A galaxy is by a definition a group of stars. If there were no stars it could not be a galaxy.
Informal balance is when a picture is not symmetrical. (asymmetrical)
heroin.
Considering the fact that a spiral galaxy is indeed a spiral, I will say no.
Basically it is asking what the definition for galaxy is, it is: A gaint structure that contains hundreds of billions of stars.
Since a sine wave is described by the trigonometric sin(x) function, which is symmetrical, the sine wave is also symmetrical, unless there is a DC bias, in which case it is not. (It depends on your definition of symmetry)
This is my own definition of horizontal symmetry (no source)- Symmetry to describe a figure that is symmetrical after being reflected over a horizontal line.
bcuz teh anwser is the spiral galaxy and teh def is that teh galaxy is spirral. like a apple :P
A galaxy is a system of stars, gas, dust, and largely dark matter that are bound together by gravity. Our home galaxy fits this definition, so it is called a galaxy.
That's basically the definition of an active galaxy, so I would say, all of them.