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 lightyear is the distance light travels in vacuum in one Julian year. A light-year is equal to 9,460,730,472,580.8 km (about 9.461 Pm) or about 5,878,625,373,183.61 statute miles or about 63,241.077 AU (often approximated to 63,240 AU) or about 0.306 601 394 parsecs.