When one looks up to the sky at night, one can see the stars shining, their light reaching us from the depths of the cosmos. If one takes out a large telescope which doesn’t just detect visible light, but all kinds of electromagnetic radiation, one can see much more: Gamma rays from distant galaxies, X-rays coming from cosmic radiation, visible light from stars, galaxies and nebulae, and the deep infrared glow from dust and hydrogen which floats through our galaxy between the stars.
KeywordsDark Matter Visible Light Electromagnetic Radiation Cosmic Microwave Background Radio Telescope
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