Misc: What was the name of the Titanic's sister ship?

Questions

23 March 1960 ---------- (8) fails to reach Earth orbit ?

24 March 1960 US appeals court rules novel, "Lady Chatterly's Lover", not ---------- ?

25 March 1960 1st guided missile launched from ---------- powered sub (Halibut) ?

26 March 1960 ---------- executes 30 after attack on President Kassem ?

28 March 1960 ---------- factory explodes burying 20 firefighters (Glasgow Scotland) ?