Biologists Explain The Difference Between A Crane Fly And Big Flying Mosquito

May 3, 2022 · How old is the universe, and is it expanding? Our best understanding of the history of the universe comes from the Big Bang theory. Feb 21, 2026 · Discover what the Universe is, how it began, and how it will evolve. Learn about the Big Bang, cosmic expansion, distant galaxies, the five eras of the Universe, and theories such as the. The term Universe refers to everything within the Cosmos – planets, stars, galaxies, light and even the vacuum between these entities. Astronomers often talk about “the observable Universe ” which is. The universe is space and everything in it. [1][2][3][4] It is made of many billions of stars and planets and enormous clouds of gas separated by big spaces. The Big Bang started the expansion of the universe. Returning to the image of the expanding universe as a balloon inflating, if tiny dots are painted on the ballon to represent galaxies, then as the balloon expands so the distance between the dots.