What is astronomy?
Astronomy is the study of the universe, the celestial objects that make up the universe, and the processes that govern the lifecycle of those objects.
Astronomy is largely an observational science. Astronomers use the electromagnetic radiation emitted from stars and other celestial objects, which can include visible light, UV, infrared, and X-rays. Because the light from these objects is the primary means to study them, one of the most important tools for an astronomer is the telescope.
Given the size of the universe (which could be infinite), astronomy is an enormous field.
The celestial objects that astronomers study include stars, galaxies, nebulae, and supernova.
Because of the enormous distances between Earth and other objects, when astronomers look farther away, they are also looking back in time. This is because of the amount of time it takes the light we see to travel from the source to us here on Earth.
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