It's a galaxy from the dawn of the universe!
Thirteen billion years is a long time to wait to be noticed but, for UDFy-38135539 (which we’ll call Bob for convenience), the wait has finally paid off and Bob is now a record breaker.
Bob is the tiny little dot that you (might) be able to see hiding in the middle of that circle on the right. It may not look like much, but that slightly red-tinged dot is officially the most distant galaxy ever recorded.
It is red because its light has been slogging its way across the universe for more than 13billion years and, in doing so, its wavelength has become stretched until (from where we are looking at it) it moved into the red end of the spectrum. This colour change is called ‘redshift’ and more shift the red has, the further away the object is.