Misc: how many lettered tiles are in a game of scrabble?

Questions

50s: This European principality gained a princess in 1956.?

50s: This flop car was introduced in the 50's.?

50s: This was created by the treaty of Rome in 1957?

60s: 1964 release was the most successful Disney film to date.?

60s: Discovered in 1967, pulsating radio sources in space are better known as this?