The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. ... The Universe contains billions of galaxies, each containing millions or even trillio...
The atmosphere blocks some kind of radiation, such as X-rays and gamma rays, but these can be studied by telescopes in space. It also blurs visible-light images, but this is not a problem in space, where telescopes can capture sharper, more detailed images.
Examples:
Chandra X-ray Observatory
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Spitzer Space Telescope
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Hubble Space Telescope
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