Space
How Big Is the Universe — and How Much of It Can We Actually See?
The observable universe is 93 billion light-years across. The full universe is bigger — possibly infinitely so. Here's what we can measure, what we can't, and why.
13 articles tagged with #big-bang
The observable universe is 93 billion light-years across. The full universe is bigger — possibly infinitely so. Here's what we can measure, what we can't, and why.