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).
1 light year is the distance light can travel in vacuum in one year s time this distance is equivalent to roughly 9461000000000 km or 5878000000000 miles this is such a large distance for comparison consider the circumference of the earth when measured at the equator 40075 km