Scientists have found fossil evidence from tropical corals that existed at that time, and they have about 400 daily growth rings per year.
Canadian scientists studying water found deep in an underground mine have determined that the water is at least 1.5 billion years old, and maybe much older.
Scientists have a new estimate for the geological age of one of Mercury's oldest regions.
NASA's Curiosity rover has found evidence for life-supporting conditions on ancient Mars.
For years scientists thought only two planets in our solar system had tectonic plates. But, now, it looks like Mars is joining the club.
Today A Moment of Science looks at why this beloved wonder of the world may be on the rocks.
When Neil Armstrong took his "one small step", the impression he made was lasting.
Can the Mississippi River change direction?
For billions of years, the Earth's only natural satellite has been bombarded with asteroids. Surely, it's been the target of space rocks in the past.
There are a few well known warning signs, such as earthquakes in the vicinity of a known volcano. And, of course, smoke rising from a volcano.