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).
It is so fast that light can travel about seven times around Earth in one second!! Thatâs about light. What is a light year then? Light Year is the distance that light can travel in one year. Considering that light can travel about 300,000 kilometers (km) each second, in one year, it can travel 9,500,000,000,000 kilometers. Phew! It would be easier to say that one light year is about 10 trillion km.