Apparent retrograde motion notable on Mars which has two natural satellites, Phobos and Deimos. Both moons orbit Mars in an eastward (prograde) direction, however Deimos has an orbital period of 1.23 Martian sidereal days, making it supersynchronous, whereas Phobos has an orbital period of 0.31 Martian sidereal days making it subsynchronous. Consequently, although both moons are travelling in an eastward (prograde) direction, they appear to be travelling in opposite directions when viewed from the surface of Mars due to their orbital periods in relation to the rotational period of the planet. All other planetary bodies in the Solar System also appear to periodically
Two Is Better Than One Two Is Better Than One "Two Is Better Than One" is a song by the American rock band Boys Like Girls from their second studio album "Love Drunk" (2009). The song features American singer Taylor Swift. It was written by Martin Johnson and Swift and the song is the band's second official single from the album. On some advanced copies of the album sent to reviewers and members of the press, the song does not feature Swift, rather, Johnson handles all vocals. The track was a commercial success. By December 2011, "Two Is Better Than One" had sold 1,508,000 copies