Telescopes can see galaxies whose light has been travelling almost 13.8 billion years and thus look as they did just after the Big Bang. Because the Universe is expanding at an accelerated rate, those galaxies are now some 46 billion light-years away. The observable Universe thus has a diameter of 93 billion light-years, yet plenty is beyond that horizon. But how much?
Click the webpage below and get into the Smithsonian Website. If you have the patience and are interested, go to the bottom of the page and start the 18 mins video on Cosmography of the Local Universe. Be warned that you will be challenged by a heavily French-accented English commentary.
View the video here: