The universe stretches light from distant galaxies
The universe's expansion stretches light from distant galaxies, shifting it to redder wavelengths and revealing cosmic history and the universe's dynamic growth.
Light from faraway galaxies gets stretched and shifted toward red wavelengths as it travels through our expanding universe. This "cosmological redshift," observed by Edwin Hubble in 1929, isn't just a Doppler effect; it's space itself expanding between us and the light source. The farther the galaxy, the greater the stretch, with some light stretching over eight times its original length.
There's more to this story — open the app to keep reading.
Continue Reading in App
2 more paragraphs · plus a 3-question quiz