Astronomers have discovered a remarkable planetary system that challenges long-held assumptions about where planets can ...

Phoebe, discovered by William Henry Pickering ... or orbit in the opposite direction to the spin of the planet, in what is known as retrograde orbit. The vast majority of Saturn's 274 moons ...

Verbiscer and colleagues' discovery 1 of a disk of material surrounding Saturn, corresponding to Phoebe's orbit, is strong ... certainly rotates backwards ('retrograde'), the first ring known ...

Planets form out of the same swirling gas cloud that creates a star, so they are expected to orbit in the same direction that the star rotates. The new planet is thought to have been flung into its ...

In a 2012 research report, Dr. Simon Albrecht pointed out that certain gravitational effects between the central star and HAT-P-7b would prevent the long-term maintenance of its retrograde orbit.

Mercury retrograde: Several planets appear to 'step back,' and here's what that means. The planets that fall inside Earth's orbit around the Sun – Mercury and Venus – mostly appear to be ...