The Universe is everything, as far as we know. A galaxy is just a collection of stars. A galaxy is huge - typically about 100,000 light-years across - but the visible Universe contains hundreds of billions of galaxies.
A satellite galaxy is one that revolves around another galaxy.
A star is one, a galaxy is many.
The arms of the Spiral Galaxy are mostly located in one plane.
it is plop of a difference
size
A galaxy contains planets and a star system contains only stars.
Galaxy is a smooth chocolate and a milky way has white stuff in the middle.
Nothing. They are the same
I'm no expert but I think they are the same phone.
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As the name suggests, the barred spiral galaxy has a barred central core.See related link for a pictorial