Colossal 'planet killer' asteroid sparked mega-tsunami on Mars, and now we know where it landed

[fred8615]

Anewly discovered impact crater on Mars was likely left by an enormous asteroid that slammed into the Red Planet around 3.4 billion years ago and may have triggered an 800-foot-tall "mega-tsunami." The colossal explosion was similar to the asteroid impact on Earth that wiped out the nonavian dinosaurs, a new study shows.

Past research has found evidence of at least two massive wave events on the ancient shoreline that once surrounded the long-lost ocean, including large chunks of debris that washed ashore and rock markings that likely carved out as displaced water slowly drained back into the ocean. The first event likely occurred around 3.4 billion years ago, and the second likely emerged around 3 billion years ago as Mars' oceans began to dry up, according to NASA.

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