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	Topics Astronomy Atomic clocks Bridges Calculators Earth's magnetic field Electricity Engineering Engines Fluids Gravity Lightning Measurement and real-life Miscellany Nobel Prize winners Optics Particle physics Physics meets biology Physics meets Earth science Scientist biographies Semiconductors and computers Sound Spacecraft Theme park physics Thermodynamics Tides Units of measurement		Topic: Astronomy Black holes All about black holes. Cosmic Microwave Background What has a temperature of 3 kelvin and appears in every direction you look? The Cosmic Microwave Background, or CMB. Hubble Space Telescope NASA's famous telescope uses a mirror to make images at mainly visual wavelengths. The Chandra X-ray Observatory NASA's X-ray space telescope. W.M. Keck Observatory Atop Hawaii's Mauna Kea volcano lie the twin Keck reflecting telescopes. At nearly ten meters in diameter, they are the largest telescopes in the world. Yerkes Observatory Owned by the University of Chicago, the Yerkes Observatory is home to the largest refracting telescope in the world, at 40 inches in diameter.