- Detailed observation of celestial objects requires a telescope
- If something is required for something else then that something allows that something else
- Hence, telescopes allow the detailed observation of celestial objects

- Telescopes allow the detailed observation of celestial objects
- A planet is a kind of celestial object / celestial body
- Therefore, telescopes allow the detailed observation of planets

Therefore, telescopes allow the detailed observation of planets
Question
The invention of the telescope allowed which of the following to take place?

Context
- Detailed observation of celestial objects requires a telescope 
- If something is required for something else then that something allows that something else 
- A planet is a kind of celestial object / celestial body