When the Curiosity rover landed on Mars, on August 6, crowds across the country cheered. But the landing was just an early step on what will be a long journey of discovery. Since that time, the $2.5 billion, SUV-size rover has been studying Mars. What can we learn from a rover that is 154 million miles away? TIME’s Senior Editor Jeffrey Kluger explains how NASA’s Curiosity rover may tell us important information about the Red Planet. (Video provided by TIME)