Is Mercury Shrinking?!

The video discusses Mercury's shrinking surface, highlighting NASA's Messenger mission that mapped 99% of the planet. Scientists confirmed Mercury has been shrinking for over 4 billion years due to its cooling core, which causes the surface to contract, forming wrinkles and valleys. The core's heat escapes through the mantle, accelerating the shrinkage process.

What significant event did NASA undertake in 2004 related to Mercury?

Describe the appearance of Mercury's surface as observed by scientists.

How much smaller has Mercury become over the past 4 billion years?

What is the primary reason for Mercury's shrinking?

What happens to the surface of a planet when its core cools?