In the Grand Cosmic Theatre, our understanding of the universe's size has evolved dramatically. Just a century back, astronomers peered through primitive telescopes, revealing a universe that seemed vast but limited. Our known universe spanned only our own galaxy, Milky Way, a size of about 100,000 light years, which is just a cosmic neighborhood, as we now know. Enter the Hubble Space Telescope and its successes, as well as giant telescopes located on highest mountains on Earth. These cosmic eyes captured light from more and more distant galaxies, and our view of the universe's size expanded exponentially. We now know that our observable universe stretches across an astonishing 93 billion light years, and this might be just a beginning. So next time you look up to a starry sky, remember, our universe is ever growing, and we're just getting started knowing it.