Here's why:
* Mare Basins: These are large, dark, flat plains formed by ancient volcanic eruptions. The lava flows that filled these basins solidified relatively recently in lunar history.
* Oceanus Procellarum: This is the largest lunar mare and is thought to have formed from a particularly large impact event.
* Radiometric Dating: Scientists use radiometric dating techniques to determine the age of lunar rocks. The rocks in the mare basins, particularly those in Oceanus Procellarum, have consistently yielded the youngest ages, typically around 3.1 to 3.8 billion years old.
It's important to note that these ages are still extremely old compared to Earth's geological timescale, but they represent the most recent volcanic activity on the Moon.
