1 Massage the twitch muscle with your finger for 15 seconds. 2  Usually there are other muscles that twitch like leg cramps, so take 500mg of magnesium citrate capsule daily. 3  If you have headaches, massage the knot at the back of your neck for release.
Â­So to measure really long distances, people use a unit called a light year. Light travels at 186,000 miles per second (300,000 kilometers per second). Therefore, a light second is 186,000 miles (300,000 kilometers).
A light-year, also light year or lightyear (symbol: ly) is a unit of length, equal to just under 10 trillion kilometers (10Ã10 15 meters, 10 petameters or about 6 trillion miles).As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year.The light-year is often used to measure distances to stars and other distances on a galactic scale, especially in non-specialist and popular science publications.The preferred unit in astrometry is the parsec, because it can be more easily derived from, and compared with, observational data. light-year, also light year or lightyear (symbol: ly) is a unit of length, equal to just under 10 trillion kilometers (10Ã10 15 meters, 10 petameters or about 6 trillion miles).