Galaxies are far from "summary" of Space Encyclopedia by David A. Aguilar,Christine Pulliam,Patricia Daniels
The universe is a vast expanse that contains billions of galaxies, each filled with billions of stars. One of the most mind-boggling facts about galaxies is just how incredibly far away they are from us. In fact, some galaxies are so far away that the light we see from them today actually started its journey billions of years ago. The immense distances between galaxies can be difficult to grasp. To give you an idea of just how far away they are, consider this: the Milky Way, our own galaxy, is about 100,000 light-years across. This means that it would take light 100,000 years to travel from one end of the Milky Way to the other. Now imagine that there are galaxies out there that are millions or even billions of light-years away from us. The concept of galaxies being far away is not just a...
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