Phobos (moon) tidal forces. Phobos could be a second-generation Solar System object that coalesced in orbit after Mars formed, rather than forming concurrently out of the same birth cloud as Mars. Another hypothesis is that Mars was once surrounded by many Phobos- and Deimos-sized bodies, perhaps ejected into orbit around it by a collision with a large planetesimal. The high porosity of the interior of Phobos (based on the density of 1.88 g/cm, voids are estimated to comprise 25 to 35 percent of Phobos's volume) is inconsistent with an asteroidal origin. Observations of Phobos in the thermal infrared suggest a composition containing
What's Easy for Two Is Hard for One What's Easy for Two Is Hard for One "What's Easy for Two Is Hard for One" (also known as "What's Easy for Two Is So Hard for One") is a song written and produced by Smokey Robinson and released as a single by singer Mary Wells for the Motown label. In this song, the narrator is longing for a longtime partnership with a suitor and constantly begs the man to "take her to the preacher man" in hopes the couple does "what should be done" because "what two can easily do is so hard to be done by one". Released