While the size of the entire Universe is still unknown. The Universe is all of space and time (spacetime) and its contents, which includes planets, moons, minor planets, stars, galaxies, the contents of intergalactic space and all matter and energy.

MilkyWay
Milky Way

Our galaxy is Milky Way which contains 100–400 billion stars. We cannot go out of our galaxy and astronomers at the University of Nottingham now say the number of galaxies in the observable Universe is 2 trillion.

“It boggles the mind that over 90 percent of the galaxies in the [observable] Universe have yet to be studied,” said Christopher Conselice, the astrophysics professor at Nottingham who led the research. “Who knows what interesting properties we will find when we discover these galaxies with future generations of telescopes?”

Star Size Comparison

 

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ALLAH HO AKBAR!!

Now, you can imagine to some extent that how big is our creator Amighty ALLAH.