Perhaps you're thinking of The Sims 3 or 4, where telescopes do exist and have various interactions.
If you are referring to The Sims 3 or 4, please let me know, and I can help you find information on debugging a telescope in those games.
If you're simply looking for ways to use the telescope in The Sims 2, you can:
* Decorate your Sim's home: Telescopes are a great way to add a science-themed touch to your Sim's living space.
* Use them as a conversation starter: Sims can interact with the telescope, though not in a functional way. They can chat about their observations, making it a great way to build relationships with other Sims.
Please clarify which game you're playing so I can provide more relevant and helpful information!