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 = the distance light travels in one year. If an object is 14 billion light-years away the universe must be at least 14 billion years old for the light to get to earth. Oh, also by estimating the amount of hydrogen that has been converted by stars into other heavier elements, etc.