Mars once was wet...
Mars once was wet and fertile. It’s now bone dry. Something bad happened on Mars. I want to know what happened on Mars so that we may prevent it from happening here on Earth.
Author : Neil deGrasse TysonTopics:
Mars once was wet and fertile. It’s now bone dry. Something bad happened on Mars. I want to know what happened on Mars so that we may prevent it from happening here on Earth.
Author : Neil deGrasse Tyson