Machines and engines are all around us. They power everything from cars and boats to airplanes and even rockets. Mechanics are experts who know how machinery works, especially engines, and how to fix them. When you think of a mechanic, you might picture someone working on cars. But mechanics can be experts on all kinds
High above the Earth, a new generation of robots designed to keep satellites working longer is replacing its predecessor — quite literally. This week, a spacecraft built and operated by Northrop Grumman called a Mission Extension Vehicle (MEV) unplugged from a communications satellite operated by the Australian firm Optus. For more than a year, the
