Simplify the following text for a Grade 6 native English-speaking person.
Original: Galileoâ s discovery proved the importance of the telescope as a tool for astronomers by showing that there were objects in space to be discovered that until then had remained unseen by the naked eye .
Simplified: Galileoâ s discovery proved the importance of the telescope as a tool for astronomers . It showed there were objects in space to be found , which were not seen by the naked eye .