Because Mercury’s orbit is only 88 days long, compared to 365 for Earth, the phenomenon of Mercury in apparent retrograde motion happens three to four times a year. In the astrology world ...

This means that, from our perspective on Earth, it appears as if Mercury is moving backward in its orbit around the sun. Mercury in retrograde is not a rare or sudden occurrence. It happens three ...

The project, which will see its components lofted to a geostationary orbit above Earth using super-heavy rockets, has been dubbed "another Three Gorges Dam project above the Earth." The new ...

Mercury, the closest planet to the sun, can't actually travel backward in retrograde ... from our perch on Earth. But this changes when two planets become aligned as they orbit the sun, Daylan ...