This is a short video with a lot of good information on measuring the universe coming from . It has long been claimed by creation and intelligent design scientists that the universe is expanding, or at least seems to be. This video shows exactly why this is the case, along with explaining the methods which are used to estimate distances of celestial objects, though potentially light-years away. As far as astronomy goes, this will catch you up to speed on how modern tactics allow astronomers to distance the universe.
Origin: Royal Museums Greenwich