Here's why:

* Redshfit: Redshift is a measure of how much the light from a distant object has been stretched due to the expansion of the universe. The further away an object is, the more its light is redshifted.

* Quasars: Quasars are extremely luminous and distant objects powered by supermassive black holes at the centers of galaxies. They are some of the most distant objects we can observe.

* Distance and Redshift: Because quasars are so incredibly far away, their light has been stretched significantly during its journey to Earth, resulting in large redshifts.

In fact, some quasars have redshifts of over 7, indicating they are billions of light-years away.