How fast are you moving right now? - Tucker Hiatt (by TED-Ed)
"How fast are you moving?" seems like an easy question, but it’s actually quite complicated — and perhaps best answered by another question: "Relative to what?" Even when you think you’re standing still, the Earth is moving relative to the Sun, which is moving relative to the Milky Way, which is…you get the idea. Tucker Hiatt unravels the concepts of absolute and relative speed.
The lead scientist on the project, Nobel laureate John Mather, says that agencies wanted a new telescope because “[researchers] believed when they built [Hubble], when they designed it, that it would be able to see the first galaxies forming in the early universe. They found a big surprise — they couldn’t.” The reason being that the oldest light in the universe has undergone a doppler shift — much like the pitch of a car horn shifts as it passes you, light shifts due to the expansion of the universe. The Hubble telescope can detect the same colors the human eye can detect and a little beyond, but it can’t detect this stretched-out, infrared light from the early universe.
Humanity has learnt a lot about the universe with the help of Hubble and i can’t wait to see the things scientists will discover with the help of JWST.