The light from these four galaxies has taken more than 13.4 billion years to reach us, as they date back to less than 400 million years after the Big Bang, when the Universe was only 2% of its current age. Distant galaxies selected and confirmed by the JWST JADES program. Image credit: Robertson et al., arXiv: 2212.04480. Astronomers measure the distance to a galaxy by determining its redshift. Due to the expansion of the Universe, distant objects...
