They use their eyes and also a variety of instruments, based on the ground or in space, which are sensitive to a large range of electromagnetic radiations.
The study of heavenly bodies is known as Astronomy.
astronomers
Astronomers.
The study of heavenly bodies is known as astronomy. Astronomers observe and analyze the stars, planets, galaxies, and other celestial objects to better understand their composition, behavior, and interactions.
Spectrograph.
A spectrometer.
Telescope.
Astronomy
Astronomy is the study of heavenly bodies.
Galileo gailes
Galileo gailes
cosmology