Optical or radio telescope
telescope
A spectrometer.
Spectrograph.
Binoculars, cameras, the human eye, probes...
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.
Planes
weights
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
Magnetometer
instruments used in plate tectonics?
A microscope would be one instrument used.
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.