A team of astronomers and geologists led by J. Alexis Rodriguez at the Planetary Science Institute in Tucson, Arizona has announced the first discovery of extraterrestrial tsunamis. They have uncovered evidence of massive tsunamis on Mars billions of years ago. Two separate megatsunamis tore across the red planet around 3.4 billion years ago, a time when Mars was a mere 1.1 billion years old and nearby Earth was just cradling its first microbial lifeforms. The two tsunamis created 150-foot-high shore-break waves on average, and some absolutely monster waves up to 400 feet tall. The scientists say the Martian tsunamis were triggered by meteor impacts, which crashed into Mars' ancient water-oceans and generated marine impact craters approximately 19 miles in diameter. The two tsunamis took place millions of years apart, although they were set off by separate impacts of roughly similar size. http://www.popularmechanics.com/space/a20941/there-were-mega-tsunamis-on-mars/