Are you fast? Can you beat a friend in a race? How about an olympic sprinter? How about a beam of light? Find out how fast light is, how far a light year is, and learn how close our nearest exoplanet ...

See a mind-blowing visual that shows just how fast light really travels through space. Coffee found to have startling effect on aging, says new study Did Trump's motorcade drive through reflecting ...

Understanding how light years work Meteorologist Hunter Forst explains just how fast light zips through space and how the light year measurement of distance works.