The earliest forming galaxies in the universe emitted ultraviolet light, but due to the expansion of the universe over 14 billion years, this light has been redshifted into the infrared spectrum; therefore, to observe the birth of galaxies, astronomers must use infrared telescopes rather than ultraviolet telescopes.
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Facts About Galaxies π w/ Neil deGrasse TysonAdded:
Here's one that always gets me.
>> The earliest forming galaxies in the universe radiated a lot of ultraviolet.
So you might say, "Well, let's get an ultraviolet telescope." No, because 14 billion years later, the expansion of the universe has redshifted the ultraviolet into the infrared. So if you want to see the birth of galaxies, you got to know what they look like in the here and the now. And in the here and the now, it's in the infrared.
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