Here's why:

* Light Gathering: Telescopes gather a lot more light than the human eye can, allowing us to see fainter and more distant stars.

* Magnification: Telescopes magnify the image of distant objects, making them appear larger and easier to study.

* Resolution: Telescopes can resolve details in the stars that are impossible to see with the naked eye, such as their shape, color, and even the presence of planets orbiting them.

While telescopes are the most common instrument, others are used for specific purposes:

* Spectrographs: These instruments break down starlight into its component colors (spectrum), revealing information about the star's temperature, composition, and motion.

* Photometers: These instruments measure the brightness of stars over time, revealing information about their variability and potential planets.

* Interferometers: These combine light from multiple telescopes to achieve even higher resolution and sensitivity, allowing us to see even more detail in the stars.

So, while telescopes are the primary tools, other instruments are used in conjunction with them to study the stars in more detail.