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).
Light travels at 300,000 kilometers per second, and the distance it travels in a single year is 9,460,730,472,580.8 kilometers. Thatâs a light year. So, for example, the star Alpha Centauri is 4.467 light years away from us, so a beam of light would take 4.467 years to get from Earth to Alpha Centauri.