The planets that were known before the telescope was invented are:

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The planets known before the telescope was invented were observed using the naked eye. They were the five brightest planets visible from Earth - Mercury, Venus, Mars, Jupiter, and Saturn. Uranus and Neptune were not discovered until the telescope was invented. Pluto was also discovered later, but it is no longer considered a planet. Out of the options given, only option B lists these five planets.

The Planets That Were Known Before the Telescope Was Invented