Within The Black

Hubble Space Telescope recently detected a star that is the most distant ever seen. Located 28 billion light-years from Earth, the ancient object — which could be a single star or a double-star system — may be up to 500 times more massive than our sun; it's also millions of times brighter than the sun and was born when the universe was young.
https://www.livescience.com/hubble-most ... -ever-seen

I read about this in news. After reading about this distant star first time spotted by Hubble, I am interested in Hubble more than the start. Hubble is a 30 years old telescope and I am interested in knowing how exactly does this work.