How Exploring Hawaiian Caves Helps NASA Search for Life on Mars
![How Exploring Hawaiian Caves Helps NASA Search for Life on Mars](http://www.nasa.gov/sites/default/files/styles/1x1_cardfeed/public/thumbnails/image/banner_8.jpg?itok=dNgiUrcN)
When a scientist found herself inside a cave beneath the Mauna Loa volcano, she felt like she had entered another world. She may as well have been on Mars, and that's precisely why she had come.