Telescope

Telescopes exist in The Sims and The Sims 2. They can be bought in buy mode. Using the telescope is Fun and increases your Logic.

Sims 1
The Horrorwitz 'Star-Track' Outdoor Telescope is a good way of increasing your Sim's Logic. However, if your Sim spends a long time looking through it (two or three points without taking a break), he or she will be abducted by aliens! A blue sphere will appear and your Sim will vanish for a few hours. When they return, their personalities will have turned upside down and they will think about aliens for quite a while afterward.

Sims 2
In The Sims 2, there are 2 telescopes, one cheap and one expensive. The Astrowonder (§550) and the Farstar e3 (§2100). But the price isn't the biggest difference - Sims using the Astrowonder won't ever be abducted, but with the Farstar it's possible. A male Sim who gets abducted may come back pregnant.

In The Sims 2: FreeTime, all of the telescope actions have a chance of alien abduction, but the Aspiration Benefit for Knowledge, Summon Aliens, allows your Sim to create a spotlight with a flashlight and the telescope, giving them a huge chance of abduction. In FreeTime, your Sims can also earn money discovering new celestial and astral bodies.

Using either telescope during daylight will make your neighbors mad at you.