What device do we use to see far-away stars?

A telescope is the correct device used to observe distant stars and celestial objects. Telescopes work by gathering and magnifying light, allowing us to see objects that are far beyond the reach of the naked eye. There are different types of telescopes, including optical, radio, and infrared, each designed to capture light in various wavelengths and provide detailed views of the universe.

In contrast, a microscope is designed for viewing very small objects, such as cells or bacteria, typically in the range of millimeters to micrometers. A stethoscope is a medical instrument used to listen to internal body sounds, such as the heartbeat or lung sounds, rather than astronomical phenomena. A periscope is a device that allows one to see around obstacles, commonly used in submarines or in situations where direct line of sight is blocked, but it is not specifically designed for astronomical observation. Hence, while all the other devices serve important functions, the telescope is the specialized instrument for viewing far-away stars.