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a stethoscope
by eyes
Cus they is BOSS
people who study about the universe are called astronomers
Electromagnetic radiation is "light." Light in various wavelengths (gamma rays through to infrared) comes to us from out in space, and astronomers use instruments called telescopes to capture it and observe the bodies and processes emitting this light.
Sometimes they do, so they can observe at night. However, there's a lot more to the job than observing in "real time". Also, there are astronomers who don't need it to be dark, for example radio astronomers.
Spectroscopy.
i have no idea but it uytr
They use a tool called a SPECTROSCOPE.
the astronomers use Absolute magnitude
They are simply one more way to observe distant objects and events.
They are called astronomers.