Add Yahoo as a preferred source to see more of our stories on Google. Three to four times a year, the planet Mercury appears to travel backward across the sky — referencing a retrograde motion. But to ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. From July 17 to Aug. 10, Mercury will appear to move ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Mercury retrograde is happening again. If you believe ...

The Perseid meteor shower kicks off Thursday, July 17, but that isn't the only thing to watch for; the Mercury Retrograde in Leo starts on the same day. Here's what it means and what to know. Three to ...

Retrograde mean motion resonances occur when orbiting bodies, moving in directions opposite to the dominant sense of motion, experience periodic gravitational interactions that can stabilise their ...