You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who is credited with the discovery of the milky way?" whose answer is Galileo Galilei.
Each document should contain about 30 words, and these documents should contain useful information.

Query: William Herschel milky way discovery
Useful Output:

Doc 1: In 1781, Herschel had the great luck to find Uranus, the first planet discovered since the days of the ancients, although he originally thought it was just a
Doc 2: William Herschel's epochal observing campaign, using a self-made 18.7-in. reflector, lasted from 1783 to 1802. During his 'sweeps,' designed
Doc 3:  Milky Way was a large collection of stars held together by mutual gravity. William Herschel attempted to actually map out the shape of the Milky
Doc 4: He is famous for the discovery of the planet Uranus, on March 13, 1781. However, this very important discovery was entirely accidental, since he
Doc 5: Onto the scene now strides William Herschel. Herschel was a superb observer, and of course discovered the planet Uranus in 178 1. After this discovery, King