ABSTRACT
Astronomers now believe that the entire universe was once a tiny speck—a gigantic amount of matter contained in a region of space so small it would be impossible to measure. Cosmology is the science of piecing together the clues to figure out how the universe began, how it came to be the way it is today, and what ultimate fate awaits the universe. These are some of the terms cosmologists use when studying the universe. The universe is made up almost entirely of ordinary matter, in which protons have a positive electrical charge and electrons have a negative charge. The universe looks more or less the same in every direction from Earth. The cosmological principle is the idea that the universe is pretty much the same everywhere, and that the parts of the universe we can’t see look a lot like the parts we can see.
