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A great description of the Planck mission to study the first seconds of the universe which we can now see as the cosmic microwave background.
Historical background and online tutorials on diffraction in which you can vary wavelength and aperture width, and see the results as wave fronts, and as an intensity graph. Explanations include the ...
Various applets allowing results to be taken for demonstration purposes.
A uniform background radiation in the microwave region of the spectrum is observed in all directions in the sky. It shows the wavelength dependence of a "black body" radiator at about 3 Kelvins ...
Read how satellite observations of cosmic microwave background can tell us a lot about how the universe formed.
A fun toy that lets you build a sledge run and then test it out. You'll need a good feel for the laws of motion to get results!
Minutephysics looks at how polarised light in the cosmic microwave background (CMB) gave rise to the discovery of gravitational waves.
Catch up with the latest news, videos and info on the Planck mission, which is studying the Cosmic Microwave Background – the relic radiation from the Big Bang.
Kaufmann's experimental results on deflection of electrons in an electromagnetic field favoured Abraham's theory, not Einstein and Lorentz, but were eventually proved wrong.
The Cosmic Microwave Background, leftover light from the big bang, carries a wealth of information about the universe — for those who can read it.
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