Could this be the most distant galaxy ever discovered?
MACS0647-JD was only discovered due to a physical process known as gravitational lensing, where the light from a very distant object is bent (by gravity) and magnified by a massive cluster of galaxies located between it and us. However, the clue to the new galaxies vast age lies in the redness of the light coming from it. With plenty of evidence to suggest that the Universe is expanding, the light travelling across it becomes stretched out over time, and therefore arrives at a longer, and therefore redder, wavelength. This is an effect known as Redshift.