Here's why:

* Height: Verona Rupes is estimated to be approximately 20 kilometers (12 miles) high. To put that in perspective, that's five times taller than Mount Everest!

* Formation: The cliff is thought to have formed due to tectonic activity or possibly a large impact that fractured the moon's surface.

* Other Contenders: While Verona Rupes holds the current record, other notable cliffs in the solar system include:

* Ithaca Chasma on Saturn's moon Tethys: A massive canyon with cliffs that reach several kilometers in height.

* Valles Marineris on Mars: A gigantic canyon system with cliffs that reach up to 7 kilometers (4.3 miles) high.

It's important to note that our knowledge of the solar system is constantly evolving, and new discoveries could reveal even taller cliffs in the future.