Mercury getting smaller: Images from NASA Messenger spacecraft shows our smallest planet is shrinking.
Why the Solar System’s Smallest Planet Keeps Getting Smaller
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March 17 2014 2:22 PM

The Incredible Shrinking Planet

Why the solar system’s smallest planet keeps getting smaller.

NASA's sun-shielded Messenger spacecraft sent back images showing Mercury's single rocky plate is contracting, with massive slabs of rock sliding over one another and creating cliffs that can reach two miles high.

Jim Festante is an actor/writer in Los Angeles and regular video contributor to Slate. He is the author of the Image Comics miniseries The End Times of Bram and Ben.