D.TheMilkyWaydidn’texistatthattime, 64.Whyhaven’tbeingsfromspacevisitedusyet accordingtoShostak A.They’reafraidofus.B.It’ salongwayaway. C.Theydon’twanttoseeus.D.Theydon’ t know how to use radio signals. 65. What does the underlined phrase “life forms” in the last paragraph ...
and that Phobos and Deimos accreted locally from disk material. Reaccumulation of disk material into rubble piles naturally leads to the formation of a collection of a dozen of moons (Rosenblatt and Charnoz2012