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 is not a unit of time, but a unit of distance. One light year is equivalent to the distance traveled by light in one Earth year. 1 light year is equivalent to 9.461 x 10^12 kilometers. If you are not used to scientific notations, thatâs around 9,461,000,000,000 kilometers in distance.