Astronomers use different instruments to observe constellations and celestial objects. Some of the most common ones include:1. Telescopes – The primary tool for observing stars and constellations.2. Binoculars – A more portable and affordable option for stargazing, useful for seeing brighter stars and constellations more clearly.3. Spectroscopes – Used to analyze the light from stars and determine their composition, temperature, and movement.4. Cameras and CCD Sensors – Astronomers use cameras with long exposure settings or CCD (Charge-Coupled Device) sensors to capture detailed images of stars and faint celestial objects.