Stellar distances are orders of magnitudes farther. After the sun, the closest star to us is a faint red dwarf named Proxima Centauri. Its distance from the sun of some 268,000 AU makes it clear that the AU is rather awkward for measuring stellar distances. A better measurement comes from the distance light travels in some unit time. Traveling at 186,000 miles per second, light travels almost six trillion miles in one year, or a distance known as the light-year. Measured this way, Proxima Centauri is some 4.2 light-years away.