useless trivia: What Word Means: Appears?

Questions

What name is given to the broad gap between the outermost and the brightest of Saturn's rings ?

Who, in 1655, discovered Saturn's rings ?

Talc is a hydrated silicate of which metal?

The duodenum and the jejunum are two of the three sections of the small intestine. Which is the third?

What is the name of the weak attractive bonds which exist between molecules?