Henry Carter Hull

Weighing as much as a small car, a rover named Curiosity rolls quietly around Mars. Scientific instruments pack its body and cluster at the end of a mechanical arm. An arrangement of lenses and instruments tops its mast, like a face. To the many NASA workers involved in Curiosity's mission on Mars, the rover is not simply a robot, but an astronaut bravely exploring an alien place. Curiosity's instruments collect data and its cameras take images of...

On the night of April 14, 1912, as it made its first voyage, the luxury steamship Titanic struck an iceberg. Then, a few hours after midnight on April 15, the ship sank thousands of feet before settling on the ocean floor. And that's where it stayed, whereabouts unknown, for the next 73 years until it was discovered by oceanographer Robert Ballard and his crew. The pictures and video Ballard brought back from the 1985 discovery helped stir new interest...