In the new sci-fi blockbuster movie "The Martian," there's a critical scene involving rocket fuel and an explosive fireball. The blast happens when astronaut Mark Watney (played by Matt Damon ...

The image above is 1 kilometer (0.6 miles) across, while the zoomed-out view below shows a Martian scene 5 km (3.1 miles ... about the size of Arizona's famous Barringer Crater, which is some ...