According to this article, the universe was created 13.8 billion years ago. The oldest light we can observe here on Earth is 13.8 billion years old–light from the Big Bang, or whatever it was. That means that the observable universe has a diameter of 27.6 billion light years. However, this number is constantly expanding. Scientists agree that the universe is expanding, but sometimes disagree at what rate. Based on one calculation, the universe could be have a diameter close to 7 trillion light years, an unimaginably giant space.
If the universe is constantly expanding, and there is no limit to which it can expand, the universe is infinitely large. Scientists are unclear on what shape the universe is–most agree that it is flat, some suggest a sphere, others a donut shape. Either way, if the universe has no end, it can be inferred that there are infinite galaxies with infinite planets (this isn’t going from the article anymore so I’m probably wrong). Anyway, if there are infinite galaxies with infinite planets, I would assume that there is a 100% chance of a planet similar enough to ours that it could sustain and house life, as long as it is possible. An expanding universe also makes me question what it is expanding into. Nothingness? The only way to learn more is to study the light that will reveal what the history of our universe.
How big is the universe? by Sam is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.