The age of the universe is 14 billion years, so in theory we are unable to observe anything further than 14 billion light-years away. Due to the expansion of space, these objects are now around 46 billion light years away — the limit of the observable universe.

Cool!

Also cool:

Most of us have trouble visualizing the height of buildings, or the distance it takes to get home from work, let alone things on an intergalactic scale. The above interactive graphic made by 14-year-old Cary Huang may be the best tool to help us understand our place in our vast universe. The interactive piece allows the viewer to zoom through scale and space, from quarks to galactic clusters. The real genius of the interface is the ability to scroll back to a familiar object like a car — the time spent scrolling helps to convey a sense of size and distance.

Whoa:

Mind blown:

6. Sloan Great Wall (10^25 m)

Structure exists on nearly all scales in the universe. Matter clumps under its own gravity into planets, stars, galaxies, clusters, and superclusters. Until recently, the Sloan Great Wall is the largest known structure in the universe, consisting of a giant filament (or wall) of galaxies, 1.4 billion light years across. Last year, astronomers discovered a larger structure — a large quasar group measuring 4 billion light years across.

Beautiful: