What is the knocking sound coming from my engine? What is engine knock? Why is my engine making a knocking noise? Engine knock, or pinging, occurs when a separate pocket of air-fuel mixture ignites ...

In 2003, during his maiden spaceflight, China’s first astronaut,Yang Liwei, encountered a strange and unsettling phenomenon: a mysterious knocking sound. As he navigated the vast emptiness of space, ...

Space horror is a part of our popular culture. An episode of "Doctor Who" called "Listen," featuring Peter Capaldi in the titular role, saw the Doctor investigate a supposed creature that can never ...