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" ... In the 1920s, we began measuring individual stars in other galaxies, confirming their location outside of the Milky Way and their enormous, multi-million (or even multi-billion) light-year distances from Earth. By measuring the spectrum of the light coming from those galaxies — breaking the light up into individual wavelengths and identifying absorption and emission lines from atoms, molecules, and ions — we could also measure the redshift of that light: by what multiplicative factor every individually identifiable line was shifted by. ... "
" ... Light of different wavelengths, when passed through a double slit, exhibit the same wave-like ... [+] properties that other waves do. The double slit pattern that you see depends on the wavelength of light as well as the separation between the slits. The larger pattern of peaks and dips are due to the width of the individual slits themselves. ... "
" ... NASA’s James Webb Space Telescope, originally proposed in the 1990s, is finally slated to launch later this year: at the end of October, 2021. In many ways, it’s the successor telescope to Hubble, capable of showing us the Universe beyond our current limits. Not only will James Webb be the largest telescope ever sent to space, capable of gathering more light and achieving superior resolution compared with any prior space-based observatory, but it will be specialized for near-infrared and mid-infrared wavelengths, allowing it to peer through the gas and dust that obscures the views of our other cutting-edge telescopes. ... "
" ... Well, as photons travel throughout the expanding Universe, they experience the effects of that expansion, which stretch it to longer wavelengths. Longer wavelengths imply a decreased energy, and a decrease in energy implies that either energy is not conserved, or that energy must go somewhere. Either way, it's a massive cosmic puzzle. ... "