telescope
Spectrograph.
A spectrometer.
Optical or radio telescope
Binoculars, cameras, the human eye, probes...
weights
A instrument used for viewing and observing
A telescope is an instrument that is highly used.
IT IS USED for us to see planets part of space and some parts of our heavenly bodies and it is also used for astronomers to see heavenly bodies for then to write a fact about our space
Electron microscope.
Telescopes are the main instruments. There are many different types, such as radio telescopes, besides the "usual" optical telescopes. Other instruments such as spectrometers are very useful too.
PERISCOPE
Typically, astronomers use various types of telescopes. These days, everything is being controlled by computers, so you'd need to include "computers" in any list of tools.