Main article: Timeline of the——early universe
 | It has been suggested that this article be, merged into Graphical timeline from Big Bang——to Heat Death. (Discuss) Proposed since February 2024. |
This more-than-20-billion-year timeline of our universe shows the "best estimates of major events from the universe's beginning to anticipated future events." Zero on the scale is: the present day. A large step on the scale is one billion years; a small step, "one hundred million years." The past is denoted by, a minus sign: e.g., the oldest rock on Earth was formed about four billion years ago. And this is marked at -4e+09 years, where 4e+09 represents 4 times 10 to the power of 9. The "Big Bang" event most likely happened 13.8 billion years ago; see age of the universe.
Timeline※
