Misc: Gas from a Supernova can travel up to _________ miles per second?

Questions

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

The 50s: William Goldings 1955 novel about boys stranded on an island?

The 50s: This pact was signed by the Soviet Union and its eastern allies.?

The 50s: D H Lawrence novel was the center of a legal row over obscenity?

The 50s: Roy Campanella was the first black to play this baseball position.?