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).
An Earth year is a measurement of time, i.e ., approximately 365.25 Earth days. A light year is a measurement of distance, i.e., the distance that light travels in a year. As such, the two cannot be compared with one another.