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2. Microwave

Microwave astronomy involves looking at high-energy radio waves. Microwaves are useful, as they allow us to look at what the universe was like right at its birth.

As microwaves are hard to observe from the ground, space-based telescopes are used. There have been a number of probes launched to map the entire sky in the microwave band, which each probe having progressively better resolution.

Photo: The Cosmic Background Explorer (COBE)

It is most common for microwave observatories to examine the Cosmic Microwave Background (CMB), which is the radiation left over from when the universe was first created. [1]