The Spectra.
spectra (shows the composition)
the astronomers use Absolute magnitude
Astronomers use infrared light to map the dust in between stars.
They are the same.
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They use the bathroom like anyone else in a house or building. They use the restroom, they are astronomers, not astronauts.
Astronomers can use their eyes to study the stars. They can also use various telescopes that either refract, reflect, and detect exotic formations.
telescope
Yes
Astronomers use an auditory up on a hillside, and away from cities and pollution. So what i'm trying to say is that astronomers use an auditory to study the components of the universe.
Astronomers use a telescope to view planets directly.